CN101291313B - Wireless signal transmitting method, system and mobile station - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及无线通信领域，特别涉及基于正交频分复用(OrthogonalFrequency Division Multiplexing，简称“OFDM”)的信号发射技术。 The present invention relates to the field of wireless communication, in particular to a signal transmission technology based on Orthogonal Frequency Division Multiplexing ("OFDM"). the
背景技术Background technique
近些年来，以正交频分复用(Orthogonal Frequency Division Multiplexing，简称“OFDM”)为代表的多载波传输技术受到了人们的广泛关注。实际上OFDM是多载波调制(Multi-Carrier Modulation，简称“MCM”)的一种。其主要思想是：将信道分成若干正交子信道，将高速数据信号转换成并行的低速子数据流，调制到每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开，这样可以减少子信道之间相互的信道间干扰(InterChannel Interference，简称“ICI”)。每个子信道上的信号带宽小于信道的相关带宽，因此每个子信道上的可以看成平坦性衰落，从而可以消除符号间干扰。而且由于每个子信道的带宽仅仅是原信道带宽的一小部分，因此信道均衡变得相对容易。 In recent years, the multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing ("OFDM") has attracted widespread attention. In fact, OFDM is a kind of multi-carrier modulation (Multi-Carrier Modulation, referred to as "MCM"). The main idea is: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. Orthogonal signals can be separated by adopting correlation technology at the receiving end, which can reduce inter-channel interference (InterChannel Interference, "ICI" for short) between sub-channels. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interference can be eliminated. And since the bandwidth of each sub-channel is only a small part of the original channel bandwidth, channel equalization becomes relatively easy. the
可以在OFDM的基础上实现多址，即正交频分多址接入(OrthogonalFrequency Multiple Access，简称“OFDMA”)。多址技术解决的问题是，在移动通信系统中，有许多移动台要同时通过一个基站和其他移动台进行通信，因而必须对不同移动台和基站发出的信号赋予不同的特征，使基站能从众多移动台的信号中区分是哪个移动台发出来的信号，而各移动台又能识别出基站发出的信号中哪个是发给自己的信号。 Multiple access can be realized on the basis of OFDM, that is, Orthogonal Frequency Multiple Access (Orthogonal Frequency Multiple Access, referred to as "OFDMA"). The problem solved by multiple access technology is that in a mobile communication system, many mobile stations need to communicate with other mobile stations through a base station at the same time, so it is necessary to assign different characteristics to the signals sent by different mobile stations and base stations, so that the base station can communicate from Among the signals of many mobile stations, it is distinguished which mobile station sends the signal, and each mobile station can identify which of the signals sent by the base station is the signal sent to itself. the
本发明的发明人发现，目前基于OFDM的系统的频谱还没有得到充分的利用，频谱利用率还有进一步提高的可能。The inventors of the present invention have found that the frequency spectrum of OFDM-based systems has not been fully utilized at present, and the frequency spectrum utilization rate may be further improved.
发明内容Contents of the invention
本发明实施方式要解决的主要技术问题是提供一种无线信号发射方法、系统及移动台，使得基于OFDM的系统的频谱利用率进一步得到提高。 The main technical problem to be solved by the embodiment of the present invention is to provide a wireless signal transmission method, system and mobile station, so that the spectrum utilization rate of the OFDM-based system can be further improved. the
为解决上述技术问题，本发明的实施方式提供了一种无线信号发射方法，包含以下步骤： In order to solve the above technical problems, the embodiment of the present invention provides a wireless signal transmission method, including the following steps:
对至少两路数据流分别进行冗余性的编码，所述各路数据流是同一移动台的不同层数据流；对每一路的编码结果分别使用不同的交织器进行交织；将各路交织结果以正交频分复用OFDM方式调制在相同的时频资源上发射；所述将各路交织结果以OFDM方式调制在相同的时频资源上发射包括：将所述各路交织结果叠加为一路信号，将该路信号映射到时频资源上，再进行OFDM调制后发射。 Redundancy encoding is performed on at least two data streams, and each data stream is a different layer data stream of the same mobile station; the encoding results of each channel are interleaved using different interleavers; the interleaving results of each channel are Modulating and transmitting on the same time-frequency resource in an OFDM manner; said interleaving results of each path being modulated and transmitting on the same time-frequency resource in an OFDM manner includes: superimposing the interleaving results of each path into one path signal, map the signal to time-frequency resources, and then perform OFDM modulation before transmitting. the
本发明的实施方式还提供了一种无线信号发射系统，包含： Embodiments of the present invention also provide a wireless signal transmission system, including:
N个编码单元，分别用于对N路数据流进行冗余性编码，所述N路数据流是同一移动台的不同层数据流； N encoding units are respectively used for redundantly encoding N data streams, and the N data streams are different layer data streams of the same mobile station;
N个不同的交织器，分别用于对每个编码单元输出的编码结果进行交织； N different interleavers are used to interleave the coding results output by each coding unit;
发射单元，用于将各交织器输出的交织结果以OFDM方式调制在相同的时频资源上发射，所述发射单元包括： The transmitting unit is used to modulate and transmit the interleaving results output by each interleaver on the same time-frequency resource in OFDM mode, and the transmitting unit includes:
加法器，用于将各所述交织器输出的交织结果叠加为一路信号； An adder, for superimposing the interleaving results output by each interleaver into a signal;
映射子单元，用于将所述加法器输出的信号映射到时频资源上； A mapping subunit, configured to map the signal output by the adder to a time-frequency resource;
调制子单元，用于对所述映射子单元的输出结果进行OFDM调制后发射； The modulation subunit is used to perform OFDM modulation on the output result of the mapping subunit before transmitting;
其中，N为大于1的整数。 Wherein, N is an integer greater than 1. the
本发明的实施方式还提供了一种移动台，包含： Embodiments of the present invention also provide a mobile station, including:
编码单元，用于对至少两路数据流进行冗余性编码，所述各路数据流是 所述移动台的不同层数据流； A coding unit, configured to perform redundant coding on at least two data streams, each of which is a data stream of a different layer of the mobile station;
交织器，用于对编码单元输出的编码结果进行交织； An interleaver, used to interleave the coding result output by the coding unit;
发射单元，用于将交织器输出的交织结果以OFDM方式调制在与其它移动台共享的时频资源上发射，包括：将所述各路交织结果叠加为一路信号，将该信号映射到时频资源上，在进行OFDM调制后发射。 The transmitting unit is configured to transmit the interleaving result output by the interleaver on the time-frequency resource shared with other mobile stations in OFDM mode, including: superimposing the interleaving results of each channel into one signal, and mapping the signal to time-frequency On resources, it is transmitted after performing OFDM modulation. the
本发明的实施方式还提供了一种无线信号发射方法，对K个数据流组中的每一组分别使用上文所述的方法进行发射，其中，不同的数据流组使用不同的时频资源，K为大于或等于2的整数，每个数据流组中包含至少两路数据流。 The embodiment of the present invention also provides a wireless signal transmission method, each of the K data stream groups is transmitted using the method described above, wherein different data stream groups use different time-frequency resources , K is an integer greater than or equal to 2, and each data flow group contains at least two data flows. the
本发明的实施方式还提供了一种无线信号发射系统，包含K个子系统，每个子系统为上文所述的无线信号发射系统，不同的子系统使用不同的时频资源，K为大于或等于2的整数。 The embodiment of the present invention also provides a wireless signal transmission system, including K subsystems, each subsystem is the above-mentioned wireless signal transmission system, different subsystems use different time-frequency resources, K is greater than or equal to Integer of 2. the
本发明实施方式与现有技术相比，主要区别及其效果在于： Compared with the prior art, the embodiment of the present invention has the main difference and its effects in that:
通过使用不同的交织器，使多路数据流可以共享相同的时频资源，接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 By using different interleavers, multiple data streams can share the same time-frequency resource, and the receiving end can recover each data stream from the same time-frequency resource according to different interleaving methods, thereby improving the spectrum utilization of the system . the
附图说明Description of drawings
图1是根据本发明第一实施方式的无线信号发射方法流程图； Fig. 1 is a flow chart of a wireless signal transmitting method according to a first embodiment of the present invention;
图2是根据本发明第一实施方式中的编码示意图； Fig. 2 is according to the coding schematic diagram in the first embodiment of the present invention;
图3是根据本发明第一实施方式中的分布式映射与集中式映射的区别示意图； Fig. 3 is a schematic diagram showing the difference between distributed mapping and centralized mapping according to the first embodiment of the present invention;
图4是根据本发明第一实施方式的多个移动台的信号发射方法示意图； Fig. 4 is a schematic diagram of a signal transmission method of multiple mobile stations according to the first embodiment of the present invention;
图5是根据本发明第一实施方式的多个移动台的信号发射方法具体实现示意图； 5 is a schematic diagram of a specific implementation of a signal transmission method of multiple mobile stations according to the first embodiment of the present invention;
图6是根据本发明第三实施方式的无线信号发射方法中两个交织器的级联示意图； 6 is a schematic diagram of cascading two interleavers in a wireless signal transmission method according to a third embodiment of the present invention;
图7是根据本发明第四实施方式的无线信号发射方法流程图； Fig. 7 is a flow chart of a wireless signal transmitting method according to a fourth embodiment of the present invention;
图8是根据本发明第四实施方式中的多组移动台的无线信号发射方法示意图； FIG. 8 is a schematic diagram of a wireless signal transmission method for multiple groups of mobile stations according to a fourth embodiment of the present invention;
图9是根据本发明第五实施方式的无线信号发射方法流程图； Fig. 9 is a flow chart of a wireless signal transmitting method according to a fifth embodiment of the present invention;
图10是根据本发明第五实施方式中的采用分布式映射方式的示意图； FIG. 10 is a schematic diagram of a distributed mapping method according to a fifth embodiment of the present invention;
图11是根据本发明第五实施方式的多个移动台的无线信号发射方法示意图； Fig. 11 is a schematic diagram of a wireless signal transmission method of multiple mobile stations according to a fifth embodiment of the present invention;
图12是根据本发明第六实施方式的无线信号发射方法流程图； Fig. 12 is a flow chart of a wireless signal transmitting method according to a sixth embodiment of the present invention;
图13是根据本发明第七实施方式的无线信号发射系统结构示意图； 13 is a schematic structural diagram of a wireless signal transmitting system according to a seventh embodiment of the present invention;
图14是根据本发明第一实施方式的无线信号发射方法中，增加功控的实现示意图； Fig. 14 is a schematic diagram of the implementation of increasing power control in the wireless signal transmission method according to the first embodiment of the present invention;
图15是根据本发明第二实施方式的多个移动台的信号发射方法具体实现示意图； 15 is a schematic diagram of a specific implementation of a signal transmission method for multiple mobile stations according to a second embodiment of the present invention;
图16是根据本发明的无线信号发射方法的一种其它实现方式举例示意图； Fig. 16 is a schematic diagram illustrating another implementation of the wireless signal transmitting method according to the present invention;
图17是根据本发明的无线信号发射方法的另一种其它实现方式举例示意图。 Fig. 17 is a schematic diagram illustrating another implementation manner of the wireless signal transmitting method according to the present invention. the
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明的实施方式作进一步地详细描述。 In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings. the
本发明的第一实施方式涉及一种无线信号发射方法，在本实施方式中，各路数据流是同一移动台的不同层数据流，也就是说，由一个移动台在相同的时频资源上发射不同层的数据流，具体流程如图1所示。 The first embodiment of the present invention relates to a wireless signal transmission method. In this embodiment, each data stream is a different-layer data stream of the same mobile station, that is to say, a mobile station transmits data on the same time-frequency resource. The data flow of different layers is transmitted, and the specific process is shown in Figure 1. the
在步骤110中，移动台对每一路数据流分别进行冗余性的编码。具体地说，该移动台先对各路数据流分别进行纠错编码，以降低信息传输速率，通过增加冗余来提高信息传输的准确度，从而提高了在接收端被正确解出的概率。该纠错码可以是卷积码、Turbo码、LDPC码或其它纠错码。然后，该移动台对各路经纠错编码后的数据流进行扩频编码和/或重复编码，如图2所示。由于重复码是通过某种规则将信息进行重复，因此能获得时间上的分集。重复码的作用等价于扩频，所以可以用扩频码代替。对各路数据流所使用的扩频码可以相同，也可以不同。通过扩频编码和/或重复编码，将一个有效信息位扩展为多个有效信息位，编码的冗余度较高，一方面可以提高在接收端被正确解出的概率，另一方面较大的冗余度使系统在多路数据流复用相同的时频资源时仍有较低的误码率。 In
需要说明的是，在实际应用中，也可以只使用重复码(或扩频码)，与纠错码两者中的一种也可以。对不同的数据流也可以采用不同的编码方式。 It should be noted that, in practical applications, only repetition codes (or spreading codes) may be used, or one of the error correction codes may be used. Different encoding methods can also be used for different data streams. the
接着，进入步骤120，该移动台对每一路的编码结果分别使用不同的交织器进行交织。具体地说，该移动台为各路数据流分配不同交织规则的交织器，利用这些不同交织规则的交织器来区分不同的数据流。各路经编码后的数据流分别通过相应的交织器进行交织，然后，该移动台将经交织后的各路数据流叠加为一路信号。 Then, enter
接着，进入步骤130，该移动台将叠加的一路信号映射到时频资源上，再进行OFDM调制后发射。具体地说，由于OFDM调制前端包含一个N点的逆快速傅立叶变换(Inverse Fast Fourier Transform，简称“IFFT”)模块，因此载波映射就是从N点的IFFT子载波中，选取映射点的位置，即从N个IFFT子载波中，选取M个所需的子载波(N不小于M)。目前，实现载波映射的方式有分布式映射与集中式映射，相对于集中式映射而言，分布式映射具有更好的频率分集效应。分布式映射与集中式映射的区别如图3所示，(a)为集中式映射示意图，(b)为分布式映射示意图。 Next, enter
由于在本实施方式中，通过使用不同的交织器，使多路数据流可以共享 相同的时频资源，接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 Since in this embodiment, by using different interleavers, multiple data streams can share the same time-frequency resource, and the receiving end can recover each data stream from the same time-frequency resource according to different interleaving methods, thereby The spectrum utilization rate of the system is improved. the
虽然在本实施方式中是以一个移动台的信号发射方法为例进行说明，但在实际应用中，可以有k个移动台，每个移动台均采用本实施方式中的信号发射方法相同，如图4所示，不同移动台的信号通过映射到不同的时频资源上进行区分。由于各移动台是将自身的信号映射到与其它移动台不同的时频资源上，因此，各移动台自身的一组交织器可以与其它移动台的一组交织器相同，也可以与其它移动台的一组交织器不同。 Although in this embodiment, the signal transmission method of one mobile station is used as an example for illustration, in practical application, there may be k mobile stations, and each mobile station adopts the same signal transmission method in this embodiment, for example As shown in FIG. 4 , signals of different mobile stations are distinguished by being mapped to different time-frequency resources. Since each mobile station maps its own signal to time-frequency resources different from those of other mobile stations, the set of interleavers of each mobile station can be the same as that of other mobile stations, or can be the same as that of other mobile stations. Each station has a different set of interleavers. the
图5为多个移动台的信号发射方法具体实现示意图，其中，移相键控(Phase Shift Keying，简称“PSK”)为一种调制方式，可以放在交织器前，也可以放在交织器后。移动台1所采用的n个交织器可以和移动台k中的n个交织器相同，也可以不同。对某个移动台而言，如第k个移动台，原始信号dk通过串并转换，得到n层并行数据dk，n，经编码模块编码后得到数据流bk，n，通过交织器得到数据流xk，n，然后将通过交织、PSK调制后的数据流叠加为sk，将sk映射到时频资源上，再进行OFDM调制后发射。每个移动台通过不同的载波映射方式，将每个移动台的数据映射到不同的时频资源上去，然后通过OFDM调制发送。 Figure 5 is a schematic diagram of the specific implementation of the signal transmission method of multiple mobile stations, wherein Phase Shift Keying (Phase Shift Keying, referred to as "PSK") is a modulation method that can be placed before the interleaver or placed in the interleaver back. The n interleavers used by
值得一提的是，在将PSK调制后的数据流叠加为sk之前，还可以对PSK调制后的各路数据流进行功率控制，再将经功率控制后的各路数据流叠加为sk，如图14所示。通过对各路数据流进行功率控制，可使得各路数据流的干扰能够有更明显的强弱区分，从而便于接收端能够更方便地恢复出各路数据流。 It is worth mentioning that before superimposing the PSK-modulated data streams into sk, power control can be performed on each data stream after PSK modulation, and then the power-controlled data streams can be superimposed into sk, such as Figure 14 shows. By controlling the power of each data stream, the interference of each data stream can be distinguished more clearly, so that the receiving end can restore each data stream more conveniently. the
本发明的第二实施方式涉及一种无线信号发射方法，本实施方式与第一实施方式大致相同，其区别在于，在第一实施方式中，对某个移动台而言，如第k个移动台，原始的串行数据是通过串并转换后，得到n层并行数据dk， n，然后再对每一层并行数据进行纠错编码(如图5所示)；而在本实施方式中，先对串行数据进行纠错编码，然后将经纠错编码的串行数据转换为n层并行数据，如图15所示。 The second embodiment of the present invention relates to a wireless signal transmission method. This embodiment is roughly the same as the first embodiment, the difference is that in the first embodiment, for a certain mobile station, for example, the kth mobile Taiwan, the original serial data is after serial-to-parallel conversion, obtains n layers of parallel data dk, n, and then carries out error correction encoding (as shown in Figure 5) to each layer of parallel data; and in the present embodiment, The serial data is firstly encoded with error correction, and then the encoded serial data is converted into n-layer parallel data, as shown in Figure 15. the
由于本实施方式中仍可通过使用不同的交织器，使多路数据流可以共享相同的时频资源，因此具有与第一实施方式相同的有益效果。 Since different interleavers can still be used in this embodiment to enable multiple data streams to share the same time-frequency resource, it has the same beneficial effect as the first embodiment. the
不难发现，第一、第二实施方式的实质在于，对至少两路数据流分别进行冗余性的编码，对每一路的编码结果分别使用不同的交织器进行交织，将各路交织结果以OFDM方式调制在相同的时频资源上发射，以达到提高系统频谱利用率的目的。因此，在实际应用中，也可以有其它不同于第一、第二实施方式的具体实现方法。 It is not difficult to find that the essence of the first and second embodiments is to perform redundant encoding on at least two data streams, use different interleavers to interleave the encoding results of each channel, and combine the interleaving results of each channel with OFDM modulation is transmitted on the same time-frequency resource to achieve the purpose of improving system spectrum utilization. Therefore, in practical applications, there may also be other specific implementation methods different from those in the first and second embodiments. the
比如说，在串并转换前先对移动台的数据进行纠错编码，在将串行数据转换为并行数据后，可以直接进行交织(如图16所示)，也可以在将串行数据转换为并行数据后，对转换后的并行数据进行编码，然后再进行交织，对转换后的并行数据所进行的编码，可以是纠错码也可以是其它的编码，或是纠错码与其它编码的组合(如图17所示)。 For example, before serial-to-parallel conversion, error correction coding is performed on the data of the mobile station. After the serial data is converted into parallel data, interleaving can be performed directly (as shown in Figure 16), or the serial data can be converted into After the parallel data is converted, the converted parallel data is encoded, and then interleaved. The encoding of the converted parallel data can be an error correction code or other codes, or an error correction code and other codes combination (as shown in Figure 17). the
本发明的第三实施方式涉及一种无线信号发射方法，本实施方式在第一实施方式的基础上，进一步对各路数据流的交织处理进行改进。 The third embodiment of the present invention relates to a wireless signal transmission method. On the basis of the first embodiment, this embodiment further improves the interleaving processing of each data stream. the
具体地说，在本实施方式中，分别为各路数据流分配的不同规则的交织器由两个比该交织器短的交织器级联而成。比如说，通过纠错编码后的码字长度为N，扩频因子(或者，重复码次数、重复码率的倒数)为G，那么，交织器的处理长度为N×G。在第一实施方式中直接采用处理长度为N×G的交织器，处理长度为N×G的交织器可以通过采用随机交织器生成。而在本实施方式中，采用G个处理长度为N的随机交织器进行级联组成处理长度为G×N的交织器。 Specifically, in this embodiment, interleavers with different rules allocated to each data stream are formed by cascading two interleavers shorter than the interleaver. For example, if the code word length after error correction coding is N, and the spreading factor (or the number of repeated codes, the reciprocal of the repeated code rate) is G, then the processing length of the interleaver is N×G. In the first embodiment, an interleaver with a processing length of N×G is directly used, and an interleaver with a processing length of N×G can be generated by using a random interleaver. However, in this embodiment, G random interleavers with a processing length of N are used for cascading to form an interleaver with a processing length of G×N. the
如图6所示，假设经纠错编码后的码字长度为5，并经扩频因子(重复 次数)为2后的数据流为1234512345，则在本实施方式中，对每个为12345的数据块分配一个对应的处理长度为5的交织器，对数据块中的数据进行交织。 As shown in Figure 6, assuming that the code word length after error correction encoding is 5, and the data stream after the spreading factor (number of repetitions) is 2 is 1234512345, then in this embodiment, for each 12345 The data block is assigned a corresponding interleaver with a processing length of 5 to interleave the data in the data block. the
通过对一个处理长度为L的交织器，采用n个处理长度为L/n的交织器进行级联而成，可以更便于硬件实现，而且处理时延较短。 It is formed by cascading an interleaver with a processing length L by cascading n interleavers with a processing length L/n, which is more convenient for hardware implementation and has a shorter processing delay. the
本发明的第四实施方式涉及一种无线信号发射方法，本实施方式与第一实施方式大致相同，其区别在于，在第一实施方式中，各路数据流是同一移动台的不同层数据流，因此，该移动台可通过将经编码、交织后的各路数据流叠加为一路信号，将各路数据流在相同的时频资源上发射。而在本实施方式中，各路数据流是不同移动台的数据流，如图7所示。各移动台的交织器为不同交织规则的交织器，该交织器组用于区分不同移动台的数据流，各移动台通过将本移动台的经交织后的数据流以OFDM方式调制在相同的时频资源上，将各路数据流在相同的时频资源上发射。使得接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 The fourth embodiment of the present invention relates to a wireless signal transmission method. This embodiment is roughly the same as the first embodiment, the difference is that in the first embodiment, each data stream is a different layer data stream of the same mobile station , therefore, the mobile station can transmit each data stream on the same time-frequency resource by superimposing the coded and interleaved data streams into one signal. However, in this embodiment, each data stream is a data stream of a different mobile station, as shown in FIG. 7 . The interleavers of each mobile station are interleavers with different interleaving rules. The interleaver group is used to distinguish the data streams of different mobile stations. Each mobile station modulates the interleaved data stream of its own mobile station in the same On the time-frequency resource, each data stream is transmitted on the same time-frequency resource. This enables the receiving end to recover various data streams from the same time-frequency resource according to different interleaving modes, thereby improving the spectrum utilization rate of the system. the
需要说明的是，如图7所示的各移动台可视为一组移动台，在实际应用中，可以包含多组这样的移动台，如图8所示。 It should be noted that each mobile station shown in FIG. 7 can be regarded as a group of mobile stations. In practical applications, multiple groups of such mobile stations may be included, as shown in FIG. 8 . the
对于每个组而言，通过该组中的不同规则的交织器区分各移动台；组与组之间，通过映射到不同的时频资源来区分各组的移动台，因此不同组内的交织器可以相同，也可以不同。 For each group, the mobile stations are distinguished by the interleavers of different rules in the group; between groups, the mobile stations of each group are distinguished by mapping to different time-frequency resources, so the interleaving in different groups can be the same or different. the
本发明的第五实施方式涉及一种无线信号发射方法，本实施方式与第一实施方式大致相同，其区别在于，在第一实施方式中，将经交织后的各路数据流叠加为一路信号后，直接映射到时频资源上，而在本实施方式中，将经交织后的各路数据流叠加为一路信号后，先进行离散傅立叶变换(DiscreteFourier Transformation，简称“DFT”)，再映射到时频资源上。本实施方式 中的各路数据流同样是同一移动台的不同层数据流。 The fifth embodiment of the present invention relates to a wireless signal transmission method. This embodiment is roughly the same as the first embodiment. The difference is that in the first embodiment, the interleaved data streams are superimposed into one signal After that, it is directly mapped to the time-frequency resource, and in this embodiment, after the interleaved data streams are superimposed into one signal, the discrete Fourier transform (DiscreteFourier Transformation, referred to as "DFT") is first performed, and then mapped to on time-frequency resources. The various data streams in this embodiment are also data streams of different layers of the same mobile station. the
具体地说，如图9所示，在步骤910中，该移动台对每一路数据流分别进行冗余性的编码。本步骤与步骤110完全相同，在此不再赘述。 Specifically, as shown in FIG. 9, in
接着，进入步骤920，该移动台对每一路的编码结果分别使用不同的交织器进行交织。本步骤与步骤120完全相同，在此不再赘述。 Then, enter
接着，在步骤930中，该移动台将叠加后的一路信号进行DFT变换。在实际应用中，DFT通常采用快速傅立叶变换(Fast Fourier Transform，简称“FFT”)来实现。 Next, in
接着，进入步骤940，该移动台将经DFT变换的该路信号映射到时频资源上，再进行OFDM调制后发射。可以采用分布式映射与集中式映射的方式将经DFT变换的该路信号映射到时频资源上，采用分布式映射的方式如图10所示。 Next, enter
与第一实施方式类似，虽然在本实施方式中是以一个移动台的信号发射方法为例进行说明，但在实际应用中，可以有k个本实施方式中涉及的移动台，每个移动台均采用本实施方式中的信号发射方法相同，如图11所示，不同移动台的信号通过映射到不同的时频资源上进行区分。由于各移动台是将自身的信号映射到与其它移动台不同的时频资源上，因此，各移动台自身的一组交织器可以与其它移动台的一组交织器相同，也可以与其它移动台的一组交织器不同。 Similar to the first embodiment, although in this embodiment the signal transmission method of one mobile station is used as an example for illustration, in practical applications, there may be k mobile stations involved in this embodiment, and each mobile station Both adopt the same signal transmission method in this embodiment. As shown in FIG. 11 , signals of different mobile stations are distinguished by being mapped to different time-frequency resources. Since each mobile station maps its own signal to time-frequency resources different from those of other mobile stations, the set of interleavers of each mobile station can be the same as that of other mobile stations, or can be the same as that of other mobile stations. Each station has a different set of interleavers. the
由于在本实施方式中，先DFT变换后进行OFDM调制，而OFDM调制中包含离散傅立叶逆变换(Inverse Discrete Fourier Transformation，简称“IDFT”)变换(IDFT变换通常采用IFFT变换实现)，相当于以时域形式发射数据流，所以发射同步序列的功率峰均比(Peak Average Power Ratio，简称“PAPR”)得以降低，传输性能得以提高。 Since in this embodiment, OFDM modulation is performed after DFT transformation first, and OFDM modulation includes Inverse Discrete Fourier Transformation (Inverse Discrete Fourier Transformation, referred to as "IDFT") transformation (IDFT transformation is usually implemented by IFFT transformation), which is equivalent to The data stream is transmitted in the domain form, so the peak-to-average power ratio (Peak Average Power Ratio, referred to as "PAPR") of the transmission synchronization sequence can be reduced, and the transmission performance can be improved. the
本发明的第六实施方式涉及一种无线信号发射方法，本实施方式与第五 实施方式大致相同，其区别在于，在第五实施方式中，各路数据流是同一移动台的不同层数据流，因此，该移动台可通过将经编码、交织后的各路数据流叠加为一路信号，并在经DFT变换后，将各路数据流在相同的时频资源上发射。而在本实施方式中，各路数据流是不同移动台的数据流，如图12所示。各移动台的交织器为不同交织规则的交织器，该交织器组用于区分不同移动台的数据流，各移动台通过将本移动台的经交织后的数据流，在经DFT变换后以OFDM方式调制在相同的时频资源上，将各路数据流在相同的时频资源上发射。使得接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 The sixth embodiment of the present invention relates to a wireless signal transmission method. This embodiment is substantially the same as the fifth embodiment, the difference being that in the fifth embodiment, each data stream is a different layer data stream of the same mobile station Therefore, the mobile station can superimpose the coded and interleaved data streams into one signal, and after DFT transform, transmit the data streams on the same time-frequency resource. However, in this embodiment, each data stream is a data stream of a different mobile station, as shown in FIG. 12 . The interleavers of each mobile station are interleavers with different interleaving rules. This interleaver group is used to distinguish the data streams of different mobile stations. Each mobile station transforms the interleaved data stream of its own mobile station into The OFDM mode modulates on the same time-frequency resource, and transmits each data stream on the same time-frequency resource. This enables the receiving end to recover various data streams from the same time-frequency resource according to different interleaving modes, thereby improving the spectrum utilization rate of the system. the
需要说明的是，如图12所示的各移动台可视为一组移动台，在实际应用中，可以包含多组这样的移动台，对于每个组而言，通过该组中的不同规则的交织器区分各移动台；组与组之间，通过映射到不同的时频资源来区分各组的移动台，因此不同组内的交织器可以相同，也可以不同。 It should be noted that each mobile station shown in Figure 12 can be regarded as a group of mobile stations. In practical applications, multiple groups of such mobile stations can be included. For each group, different rules in the group The interleavers of different groups distinguish each mobile station; between groups, the mobile stations of each group are distinguished by mapping to different time-frequency resources, so the interleavers in different groups can be the same or different. the
本发明的第七实施方式涉及一种无线信号发射系统，如图13所示，包含：N个编码单元，分别用于对N路数据流进行冗余性编码；N个不同的交织器，分别用于对每个编码单元输出的编码结果进行交织；发射单元，用于将各交织器输出的交织结果以OFDM方式调制在相同的时频资源上发射。其中，N为大于1的整数。通过使用不同的交织器，使多路数据流可以共享相同的时频资源，接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 The seventh embodiment of the present invention relates to a wireless signal transmission system, as shown in FIG. 13 , including: N encoding units, respectively used to perform redundancy encoding on N data streams; N different interleavers, respectively It is used for interleaving the coding result output by each coding unit; the transmitting unit is used for modulating and transmitting the interleaving result output by each interleaver on the same time-frequency resource in OFDM mode. Wherein, N is an integer greater than 1. By using different interleavers, multiple data streams can share the same time-frequency resource, and the receiving end can recover each data stream from the same time-frequency resource according to different interleaving methods, thereby improving the spectrum utilization of the system . the
具体地说，编码单元中包含进行扩频编码的子单元和/或进行重复编码的子单元。通过扩频编码的子单元和/或重复编码的子单元，可以将一个有效信息位扩展为多个有效信息位，使得编码的冗余度较高，一方面可以提高在接收端被正确解出的概率，另一方面较大的冗余度使系统在多路数据流复用相同的时频资源时仍有较低的误码率。 Specifically, the coding unit includes a subunit for performing spread spectrum coding and/or a subunit for performing repetition coding. Through the sub-units of spread spectrum coding and/or sub-units of repeated coding, one effective information bit can be expanded into multiple effective information bits, so that the redundancy of coding is high, and on the one hand, it can improve the accuracy of being correctly decoded at the receiving end. On the other hand, the greater redundancy makes the system still have a lower bit error rate when multiple data streams multiplex the same time-frequency resources. the
而且，编码单元中还可包含进行纠错编码的子单元，用于对数据进行纠错编码后输出到扩频编码的子单元和/或进行重复编码的子单元。以降低信息传输速率，通过增加冗余来提高信息传输的准确度，从而提高了在接收端被正确解出的概率。 Moreover, the coding unit may also include a subunit for performing error correction coding, which is used to perform error correction coding on the data and output it to a subunit for spreading coding and/or a subunit for performing repetitive coding. In order to reduce the information transmission rate, the accuracy of information transmission is improved by increasing redundancy, thereby increasing the probability of being correctly solved at the receiving end. the
交织器可以由至少两个比该交织器短的交织器级联而成。使得在硬件上更容易实现，而且处理时延较短。 An interleaver may be formed by cascading at least two interleavers shorter than the interleaver. This makes it easier to implement on hardware, and the processing delay is shorter. the
对于N路数据流是同一移动台的不同层数据流的情况而言，发射单元包含：加法器，用于将各交织器输出的交织结果叠加为一路信号；映射子单元，用于将加法器输出的信号映射到时频资源上；和调制子单元，用于对映射子单元的输出结果进行OFDM调制后发射。该发射单元还可以包含DFT子单元，用于对加法器输出的信号进行DFT变换后输出到映射子单元，以降低发射同步序列的PAPR。 For the case where the N data streams are different layer data streams of the same mobile station, the transmitting unit includes: an adder for superimposing the interleaving results output by each interleaver into one signal; a mapping subunit for combining the adder The output signal is mapped to the time-frequency resource; and the modulation subunit is used to perform OFDM modulation on the output result of the mapping subunit before transmitting. The transmitting unit may also include a DFT subunit, which is used to perform DFT transformation on the signal output by the adder and output it to the mapping subunit, so as to reduce the PAPR of transmitting the synchronization sequence. the
对于N路数据流是N个不同移动台的数据流的情况而言，发射单元有N个，每个移动台中包含一个编码单元，一个交织器，和一个发射单元。发射单元包含：映射子单元和调制子单元。映射子单元用于将交织器输出的信号映射到时频资源上，其中，N个移动台中的映射子单元都将信号映射到相同的时频资源上；调制子单元用于对映射子单元的输出结果进行OFDM调制后发射。该发射单元还可以包含DFT子单元，用于对来自交织器的交织结果进行DFT变换后输出到映射子单元，以降低发射同步序列的PAPR。 For the case where the N data streams are the data streams of N different mobile stations, there are N transmitting units, and each mobile station includes a coding unit, an interleaver, and a transmitting unit. The transmitting unit includes: a mapping subunit and a modulating subunit. The mapping subunit is used to map the signal output by the interleaver to the time-frequency resource, wherein, the mapping subunits in the N mobile stations all map the signal to the same time-frequency resource; the modulation subunit is used to map the signal of the mapping subunit The output result is transmitted after OFDM modulation. The transmitting unit may also include a DFT subunit, which is used to perform DFT transformation on the interleaving result from the interleaver and output it to the mapping subunit, so as to reduce the PAPR of transmitting the synchronization sequence. the
本发明的第八实施方式涉及一种无线信号发射系统，该系统包含K(K为大于或等于2的整数)个子系统，每个子系统为第七实施方式的无线信号发射系统，不同的子系统使用不同的时频资源。通过将交织复用(InterleaveDivision Multiplexing，简称“IDM”)与OFDMA的结合，使本系统与OFDMA系统和IFDMA系统相比都有更高的频谱利用率。 The eighth embodiment of the present invention relates to a wireless signal transmission system, the system includes K (K is an integer greater than or equal to 2) subsystems, each subsystem is the wireless signal transmission system of the seventh embodiment, different subsystems Use different time-frequency resources. By combining Interleave Division Multiplexing (Interleave Division Multiplexing, "IDM") with OFDMA, the system has a higher spectrum utilization rate than the OFDMA system and the IFDMA system. the
本发明的第九实施方式涉及一种移动台，包含：编码单元，用于对数据 流进行冗余性编码；交织器，用于对编码单元输出的编码结果进行交织；发射单元，用于将交织器输出的交织结果以OFDM方式调制在与其它移动台共享的时频资源上发射。 The ninth embodiment of the present invention relates to a mobile station, comprising: a coding unit, configured to perform redundant coding on a data stream; an interleaver, configured to interleave the coding result output by the coding unit; a transmitting unit, configured to The interleaving result output by the interleaver is modulated by OFDM and transmitted on the time-frequency resource shared with other mobile stations. the
具体地说，编码单元中包含进行扩频编码的子单元和/或进行重复编码的子单元。通过扩频编码的子单元和/或重复编码的子单元，可以将一个有效信息位扩展为多个有效信息位，使得编码的冗余度较高，一方面可以提高在接收端被正确解出的概率，另一方面较大的冗余度使系统在多路数据流复用相同的时频资源时仍有较低的误码率。而且，编码单元中还可包含进行纠错编码的子单元，用于对数据进行纠错编码后输出到扩频编码的子单元和/或进行重复编码的子单元。以降低信息传输速率，通过增加冗余来提高信息传输的准确度，从而提高了在接收端被正确解出的概率。交织器可以由至少两个比该交织器短的交织器级联而成。使得在硬件上更容易实现，而且处理时延较短。 Specifically, the coding unit includes a subunit for performing spread spectrum coding and/or a subunit for performing repetition coding. Through the sub-units of spread spectrum coding and/or sub-units of repeated coding, one effective information bit can be expanded into multiple effective information bits, so that the redundancy of coding is high, and on the one hand, it can improve the accuracy of being correctly decoded at the receiving end. On the other hand, the greater redundancy makes the system still have a lower bit error rate when multiple data streams multiplex the same time-frequency resources. Moreover, the coding unit may also include a subunit for performing error correction coding, which is used to perform error correction coding on the data and output it to a subunit for spreading coding and/or a subunit for performing repetitive coding. In order to reduce the information transmission rate, the accuracy of information transmission is improved by increasing redundancy, thereby increasing the probability of being correctly solved at the receiving end. An interleaver may be formed by cascading at least two interleavers shorter than the interleaver. This makes it easier to implement on hardware, and the processing delay is shorter. the
该发射单元包含：映射子单元和调制子单元。映射子单元用于将交织器输出的信号映射到与其它移动台共享的时频资源上；调制子单元用于对映射子单元的输出结果进行OFDM调制后发射。该发射单元还可以包含DFT子单元，用于对来自交织器的交织结果进行DFT变换后输出到映射子单元，以降低发射同步序列的PAPR。 The transmitting unit includes: a mapping subunit and a modulating subunit. The mapping subunit is used to map the signal output by the interleaver to the time-frequency resource shared with other mobile stations; the modulation subunit is used to perform OFDM modulation on the output result of the mapping subunit before transmitting. The transmitting unit may also include a DFT subunit, which is used to perform DFT transformation on the interleaving result from the interleaver and output it to the mapping subunit, so as to reduce the PAPR of transmitting the synchronization sequence. the
综上所述，在本发明的实施方式中，通过使用不同的交织器，使多路数据流可以共享相同的时频资源，接收端可以根据不同的交织方式从相同的时频资源中恢复出各路数据流，从而提高了系统的频谱利用率。 To sum up, in the embodiments of the present invention, by using different interleavers, multiple data streams can share the same time-frequency resource, and the receiving end can recover from the same time-frequency resource according to different interleaving methods. Various data streams, thereby improving the spectrum utilization of the system. the
将数据流分为多个组，每一组中以不同的交织方式区分相同时频资源上的不同数据流，不同的组使用不同的时频资源。通过将IDM与OFDMA的结合，与OFDMA系统和IFDMA系统相比都有更高的频谱利用率。 The data streams are divided into multiple groups, and different interleaving methods are used in each group to distinguish different data streams on the same time-frequency resource, and different groups use different time-frequency resources. By combining IDM with OFDMA, compared with OFDMA system and IFDMA system, there is a higher spectrum utilization rate. the
通过扩频编码和/或重复编码，将一个有效信息位扩展为多个有效信息 位，编码的冗余度较高，一方面可以提高在接收端被正确解出的概率，另一方面较大的冗余度使系统在多路数据流复用相同的时频资源时仍有较低的误码率。 Through spread spectrum coding and/or repeated coding, one effective information bit is expanded into multiple effective information bits, and the redundancy of coding is high, which can improve the probability of being correctly solved at the receiving end on the one hand, and on the other hand, it is larger The redundancy makes the system still have a low bit error rate when multiple data streams multiplex the same time-frequency resources. the
通过对数据流先进行纠错编码，可以提高在接收端被正确解出的概率。 By performing error correction coding on the data stream first, the probability of being correctly decoded at the receiving end can be improved. the
先DFT变换后进行OFDM调制，而OFDM调制中包含IDFT变换，相当于以时域形式发射数据流，所以发射同步序列的峰均比得以降低，传输性能得以提高。 The OFDM modulation is performed after the DFT transformation, and the IDFT transformation is included in the OFDM modulation, which is equivalent to transmitting the data stream in the time domain, so the peak-to-average ratio of the transmission synchronization sequence is reduced and the transmission performance is improved. the
由多个较短的交织器级联成一个较长的交织器，更便于硬件实现，而且处理时延较短。 The cascading of multiple shorter interleavers into one longer interleaver is more convenient for hardware implementation, and the processing delay is shorter. the
虽然通过参照本发明的某些优选实施方式，已经对本发明进行了图示和描述，但本领域的普通技术人员应该明白，可以在形式上和细节上对其作各种改变，而不偏离本发明的精神和范围。 Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention. the
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| CN102684840B (en)* | 2012-05-29 | 2014-12-24 | 上海交通大学 | Novel coding modulation method and device for low-density parity check code |
| EP2938147A4 (en)* | 2013-01-18 | 2015-12-30 | Huawei Tech Co Ltd | Information transmission method and device |
| CN103973395A (en)* | 2013-01-28 | 2014-08-06 | 华为技术有限公司 | Data processing method, device and system in wireless communication |
| CN104811410B (en)* | 2014-01-26 | 2018-05-04 | 上海数字电视国家工程研究中心有限公司 | Construction method, sending method and the demodulation method of physical frame |
| CN105262559A (en)* | 2014-07-15 | 2016-01-20 | 中国移动通信集团公司 | Data sending method, data receiving method and related device |
| CN108432168B (en)* | 2016-06-14 | 2020-11-03 | 华为技术有限公司 | A method and device for demodulation and decoding |
| CN108306707B (en)* | 2017-01-12 | 2024-02-20 | 中兴通讯股份有限公司 | Method, device and communication system for multiple access |
| CN113556206B (en)* | 2020-04-22 | 2023-10-10 | 广州海格通信集团股份有限公司 | Anti-interference communication system, method, computer device and storage medium |
| CN114598419B (en)* | 2021-11-12 | 2023-08-01 | 北京智芯微电子科技有限公司 | Interleaver, deinterleaver, and methods of performing the same |
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