CN1150705C - The third generation mobile communication W-CDMA adaptive coherent receiving method and receiver - Google Patents

Abstract

Translated fromChinese

发明的方法是信号测量基础上的自适应相干接收方法。方法具体流程是主公共导频信道(适用于下行接收机)或者上行专用物理控制信道(Uplink DPCCH，适用于上行接收机)去除扰码和信道化码影响，做某一长度SF的积分，产生输出比特，测量其信噪比Eb/It。再使用上述输出比特与经过匹配滤波器后的业务信道比特做相关接收，测量相关接收后数据流中的残留频差Δf。根据上述两个测量结果Eb/It和Δf，自适应决定下一周期内主公共导频信道或者Uplink DPCCH的积分长度SF。基于本发明方法而设计的W-CDMA自适应相干接收机，包括可控积分长度的匹配滤波器，信噪比测量器，自适应算法控制器，时分开关，自适应刷新时钟，残留频差测量器，取共轭器，乘法器。本发明提出的W-CDMA自适应相干接收方法，提高解调信噪比，保证了移动台射频稳定度不高，移动台变速移动或无线信道非平稳特征显著的情况下解调信噪比的稳定性，同时没有增加解调用户数据的处理延时，从而提高了系统性能。

The invented method is an adaptive coherent receiving method based on signal measurement. The specific process of the method is to remove the influence of the scrambling code and the channelization code on the main common pilot channel (applicable to the downlink receiver) or the uplink dedicated physical control channel (Uplink DPCCH, applicable to the uplink receiver), and integrate a certain length of SF to generate Output bits and measure their signal-to-noise ratio Eb/It. Then use the above output bits and the traffic channel bits after the matched filter to perform correlation reception, and measure the residual frequency difference Δf in the data stream after correlation reception. According to the above two measurement results Eb/It and Δf, the integration length SF of the main common pilot channel or Uplink DPCCH in the next cycle is adaptively determined. The W-CDMA adaptive coherent receiver designed based on the method of the present invention includes a matched filter with controllable integration length, a signal-to-noise ratio measurer, an adaptive algorithm controller, a time division switch, an adaptive refresh clock, and residual frequency difference measurement device, conjugator, multiplier. The W-CDMA self-adaptive coherent receiving method proposed by the present invention improves the demodulation signal-to-noise ratio, and ensures that the radio frequency stability of the mobile station is not high, the mobile station moves at variable speed, or the wireless channel has significant non-stationary characteristics. stability without increasing the processing delay for demodulating user data, thereby improving system performance.

Description

3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance and receiver

(1) technical field:

The invention belongs to 3G (Third Generation) Moblie Wideband Code Division Multiple Access (WCDMA) (W-CDMA) technical field, especially design 3G (Third Generation) Moblie W-CDMA adaptive coherent method of reseptance and receiver.

(2) background technology:

Wideband Code Division Multiple Access (WCDMA) (W-CDMA) spread spectrum communication mode is one of 3-G (Generation Three mobile communication system) that is realizing at present.Outside the excellent specific properties such as it declines except the anti-interference and anti-multipath with conventional code division multiple access system, and power system capacity is big, and up, provisional capital employing coherent reception down, stronger to the adaptive capacity of channel, the error rate further reduces.But, in the W-CDMA system, only adopt automatic frequency control (AFC) can not eliminate the frequency difference instability of receiving-transmitting sides, Doppler frequency shift and channel random phase fully and disturb the influence that brings, these three some effects will influence the error rate of high-rate service to a great extent, need take W-CDMA adaptive coherent method of reseptance to overcome this three kinds of influences.

Traditional coherent reception method is that received signal is carried out despreading by the pilot channel matched filter, obtain pilot frequency channel signal, received signal is carried out despreading by the Traffic Channel matched filter simultaneously, obtains service bits stream, and both output is used for coherent demodulation.This coherent reception method has adopted fixing structure, and it is high to adapt to the travelling carriage radio frequency stability, the travelling carriage speed change move or wireless channel non-stationary characteristic significant situation under the transmission of high speed digit rate.

The object of the present invention is to provide a kind of adaptive coherent method of reseptance and receiver that is applicable to 3G (Third Generation) Moblie W-CDMA physical layer architecture.It is not high that this method and receiver can adapt to the travelling carriage radio frequency stability, the travelling carriage speed change move or the significant situation of wireless channel non-stationary characteristic under high speed digit rate transmission.

(3) summary of the invention:

Technical scheme of the present invention is as follows:

The method of invention is that the adaptive coherent on the signal measurement basis receives.

The inventive method is Primary Common Pilot Channel (being applicable to downlink receiver) or special physical controlling channel of upward (Uplink DPCCH, be applicable to uplink receiver) removal scrambler and channel code influence, do the integration of length SF (value is between 4-256), produce the output bit, measure its signal to noise ratio Eb/It.Re-use above-mentioned output bit and do correlation reception, the residual frequency difference Δ f after the measurement correlation reception in the data flow through the Traffic Channel bit behind the matched filter.According to above-mentioned two measurement result Eb/It and Δ f, the integration lengths SF of adaptive determining interior Primary Common Pilot Channel of following one-period or Uplink DPCCH.

Uplink DPCCH removes scrambler and channel code influence, does the integration of length SFc (value is between 4-256), produces the output bit, measures its signal to noise ratio Eb/It.The Uplink DPDCH that re-uses above-mentioned output bit and process matched filter does correlation reception, residual frequency difference Δ f in the data flow after the correlation reception that measures.According to Eb/It and Δ f, the integration lengths SFc of adaptive determining Uplink DPCCH in following one-period.

The value of the said thresholding of the inventive method can be fixed, also can the self adaptation adjustment.

The W-CDMA adaptive coherent receiver that designs based on the inventive method comprises the matched filter of controlled integration lengths, snr measurement device, the adaptive algorithm controller, time-division switching, self adaptation refresh clock, residual frequency difference measuring appliance is got conjugator, multiplier.The physical layer architecture different according to the W-CDMA uplink and downlink, the descending self-adapting coherent receiver is slightly different with up adaptive coherent receiver.

Wherein, descending self-adapting coherent receiver structure is as follows, and the input of the matched filter of the controlled integration lengths of Primary Common Pilot Channel is the baseband receiving signals of travelling carriage, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other.The output of snr measurement device links to each other with the input of adaptive algorithm controller.The matched filter input of Traffic Channel is the baseband receiving signals of travelling carriage, and output links to each other with the input of multiplier, and another input of this multiplier links to each other with the output of getting conjugator.The output of multiplier links to each other with time-division switching.The output bifurcation of time-division switching, an output downlink dedicated physical control channel (DownlinkDPCCH) is to residual frequency difference measuring appliance, and another exports downlink dedicated physical data channel (Downlink DPDCH), promptly many bit user data streams.Residual frequency difference measuring appliance outputs to the adaptive algorithm controller.The SFp that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of Primary Common Pilot Channel.Three of self adaptation refresh clock outputs divide to be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller.

The structure of up adaptive coherent receiver is to descending similar substantially, structure is as follows, and the input of the matched filter of the controlled integration lengths of Uplink DPCCH is the baseband receiving signals of base station, the output bifurcation, one links to each other with the snr measurement device, another with get conjugator and link to each other.The output of snr measurement device links to each other with the input of adaptive algorithm controller.The matched filter input of up Dedicated Physical Data Channel (Uplink DPDCH) is the baseband receiving signals of travelling carriage, and output links to each other with the input of multiplier, and another input of this multiplier links to each other with the output of getting conjugator.The output of multiplier links to each other with the input of residual frequency difference measuring appliance, and exports many bit user data streams simultaneously.Residual frequency difference measuring appliance outputs to the adaptive algorithm controller.The SFc that the output of adaptive algorithm controller refreshes is to the matched filter of the controlled integration lengths of Uplink DPCCH.Three of self adaptation refresh clock outputs divide to be clipped to snr measurement device, residual frequency difference measuring appliance and adaptive algorithm controller.

Beneficial effect of the present invention is as follows:

The W-CDMA adaptive coherent method of reseptance that the present invention proposes, improve the demodulation signal to noise ratio, guaranteed that the travelling carriage radio frequency stability is not high, the travelling carriage speed change move or the significant situation of wireless channel non-stationary characteristic under the stability of demodulation signal to noise ratio, do not increase the processing time-delay of demodulation user data simultaneously, thereby improved systematic function.

(4) description of drawings:

Fig. 1 is a W-CDMA down link self adaption receiver schematic diagram.

Fig. 2 is a W-CDMA adaptive uplink receiver schematic diagram.

(5) embodiment:

Below in conjunction with description of drawings working of an invention optimal way:

As shown in Figure 1:

Make following agreement for convenience of description: the scrambler S of Primary Common Pilot Channel_P, the channel code C of Primary Common Pilot Channel_P, the scrambler S of user traffic channel_D, the channel code C of user traffic channel_D, the refresh cycle of adaptive algorithm: T_A

Wherein, 1 is the matched filter of the controlled integration lengths of Primary Common Pilot Channel, and 2 is the matched filter of Traffic Channel, 3 is the snr measurement device, 4 is the adaptive algorithm controller, and 5 is the self adaptation refresh clock, and 6 is time-division switching, 7 is residual frequency difference measuring appliance, 8 is many bit user data outputs, and 9 is the signal to noise ratio Eb/It of snr measurement device 3 outputs, and 10 is the residual frequency difference Δ f of residual frequency difference measuring appliance 7 outputs, 11 SFp that refresh for 4 outputs of adaptive algorithm controller, 12 for getting conjugator.

As shown in Figure 2:

Make following agreement for convenience of description: the scrambler of Uplink DPCCH and Uplink DPDCH is: S_D, the channel code of Uplink DPCCH: C_C, the channel code of Uplink DPDCH: C_D, the refresh cycle of adaptive algorithm: T_A

Wherein, 13 is the matched filter of the controlled integration lengths of Uplink DPCCH, 14 is the matched filter of Uplink DPDCH, 15 is the snr measurement device, 16 is the adaptive algorithm controller, 17 is the self adaptation refresh clock, 18 is residual frequency difference measuring appliance, 19 is the signal to noise ratio Eb/It of snr measurement device 15 outputs, 20 is the residual frequency difference Δ f of residual frequency difference measuring appliance 18 outputs, 21 the SFc that refresh for 16 outputs of adaptive algorithm controller, 22 for getting conjugator, and 23 is the output of many bit user data stream.

Referring to Fig. 1

The code stream of matched filter 1 despreading of the controlled integration lengths of Primary Common Pilot Channel contains the factor (1 one j) by the decision of W-CDMA Primary Common Pilot Channel modulating characteristic, because W-CDMA Primary Common Pilot Channel transmitting terminal has been modulated a factor (1+j).

Snr measurement device 3 can adopt various snr measurement algorithms, its output signal is that the residual frequency difference measuring appliance 7 of Eb/It. can adopt various residual frequency difference Measurement Algorithm, each subchannel among the Downlink DPCCH is carried out residual frequency difference to be measured, usually use the pilot subchannel among the Downlink DPCCH to carry out residual frequency difference measurement, its output signal is Δ f.The output signal Δ f of the output signal Eb/It of snr measurement device 3 and residual frequency difference measuring appliance 7 is input to adaptive algorithm controller 4.

Can have multiple adaptive algorithm in the adaptive algorithm controller 4, the general formula of this class adaptive algorithm is$S{F}_P[n+1]=\mathrm{Function}\left(\frac{\mathrm{Eb}}{\mathrm{It}}\right[n],\mathrm{\Δf}[n],{\mathrm{SF}}_P[n\left]\right),$Wherein, SF_P[n] represents n employed SF of self adaptation cycle_P,Represent what n self adaptation period measurement went outΔ f[n] n Δ f that the self adaptation period measurement goes out of expression.

Provide a kind of the most frequently used gradient adaptive algorithm now:

The discriminant function in n self adaptation cycle is:

$\mathrm{\φ}\left[n\right]=\left(\frac{\mathrm{SIR}\_\mathrm{TH}-\frac{\mathrm{Eb}}{\mathrm{It}}\left[n\right]}{\mathrm{SIR}\_\mathrm{TH}}\right)+\mathrm{\α}\·\left(\frac{f_C-\left|\mathrm{\Δf}\right[n\left]\right|}{f_C}\right)$

Self adaptation refreshes rule:

Wherein, φ [n] is a discriminant function, and SIR_TH is a signal-noise ratio threshold, f_C(f among the W-CDMA_C=3.84MHz) be the frequency of chip, α (α＞0) is a weight factor, φ _ th1 and φ _ th2 are the discriminant function thresholding, SF_P_ MAX and SF_p_ MIN is the maximum occurrences and the minimum value of spreading factor respectively, and max () and min () are respectively and get max function and get minimum value function.

The cycle of self adaptation refresh clock 5 is T_A, get T usually_A=kT_SLOT, k ∈ N,$T_{\mathrm{SLOT}}=\frac{2}{3}\mathrm{ms},$This clock is used for controlling snr measurement device 3,, adaptive algorithm controller 4, residual frequency difference measuring appliance 7 synchronous workings.

Time-division switching 6 belongs to DownlinkDPCCH according to which bit in the regulation decision Traffic Channel of W-CDMA system, and which bit belongs to Downlink DPDCH.Many bit user data output 8 is of time-division switching 6 outputs, is Downlink DPDCH, promptly many bit user data streams, and certainly, many bit user data outputs 8 subsequent operation such as also need to decode just can obtain truly user data.

Getting conjugator 12 is used for the input complex signal is exported after getting conjugation.

Referring to Fig. 2

The matched filter 13 of the controlled integration lengths of Uplink DPCCH and the matched filter 14 of Uplink DPDCH have used same scrambler.The code stream of despreading contains the factor (j), this is by the decision of the up modulating characteristic of W-CDMA, because Uplink DPCCH transmitting terminal has been modulated a factor j in the matched filter 13 of the controlled integration lengths of Uplink DPCCH.Snr measurement device 15, adaptive algorithm controller 16, self adaptation refresh clock 17, residual frequency difference measuring appliance 18, it is similar with the corresponding construction in the accompanying drawing 1 to get conjugator 22.

Getting conjugator 12 in the adaptive coherent receiver of above-mentioned down link also can be replaced by channel estimation filters or loop filter.

Getting conjugator 22 in the adaptive coherent receiver of above-mentioned up link also can be replaced by channel estimation filters or loop filter.

Adaptive algorithm controller 4 also can use other adaptive algorithm to replace the gradient adaptive algorithm in the adaptive coherent method of reseptance of above-mentioned down link.

Adaptive algorithm controller 16 also can use other adaptive algorithm to replace the gradient adaptive algorithm in the adaptive coherent method of reseptance of above-mentioned up link.

In the baseband receiving signals of travelling carriage, isolate multipath signal in the adaptive coherent method of reseptance of above-mentioned down link, use RAKE to merge then, each has all used the structure of the adaptive coherent method of reseptance of the W-CDMA down link among the present invention in that RAKE merges, with many bit user data stream addition of all these branches, merge the customer traffic of output as RAKE at last.

In the baseband receiving signals of base station, isolate multipath signal in the adaptive coherent method of reseptance of above-mentioned up link, use RAKE to merge then, each has all used the structure of the adaptive coherent method of reseptance of the W-CDMA up link among the present invention in that RAKE merges, with many bit user data stream addition of all these branches, merge the customer traffic of output as RAKE at last.

Thresholding can all be fixed in the above-mentioned adaptive coherent receiver, perhaps all self adaptation adjustment, and perhaps a part is fixed, and another part self adaptation is adjusted.

Claims (8)

Translated fromChinese

1.一种第三代移动通信W-CDMA自适应相干接收方法，其下行链路方法按以下流程：去除主公共导频信道中扰码和信道化码的影响，做某一长度SFp的积分，产生输出比特，测量其信噪比Eb/It，再使用上述输出比特与经过匹配滤波器的业务信道做相关接收，得到的相关接收后的数据流经过时分开关后，输出的一支为下行专用物理控制信道，测量此下行专用物理控制信道中的残留频差Δf，根据Eb/It和Δf，自适应决定下一周期内主公共导频信道的积分长度SFp；1. A third-generation mobile communication W-CDMA adaptive coherent receiving method, its downlink method is as follows: remove the influence of scrambling code and channelization code in the main common pilot channel, and do the integral of a certain length SFp , generate output bits, measure its signal-to-noise ratio Eb/It, and then use the above-mentioned output bits to perform correlation reception with the traffic channel that has passed through the matched filter. Dedicated physical control channel, measuring the residual frequency difference Δf in the downlink dedicated physical control channel, and adaptively determining the integration length SFp of the main common pilot channel in the next period according to Eb/It and Δf;其上行链路方法按以下流程：上行专用物理控制信道去除扰码和信道化码影响，做某一长度SFc的积分，产生输出比特，测量其信噪比Eb/It，再使用上述输出比特与经过匹配滤波器的上行专用物理控制信道做相关接收，测量得到的相关接收后的数据流中残留频差Δf，根据Eb/It和Δf，自适应决定下一周期内上行专用物理控制信道的积分长度SFc。Its uplink method follows the following process: remove the influence of scrambling code and channelization code on the uplink dedicated physical control channel, do the integration of a certain length SFc, generate output bits, measure its signal-to-noise ratio Eb/It, and then use the above output bits and The uplink dedicated physical control channel through the matched filter is used for correlation reception, and the residual frequency difference Δf in the data stream after the correlation reception is measured. According to Eb/It and Δf, the integral of the uplink dedicated physical control channel in the next cycle is adaptively determined. Length SFc.2.一种第三代移动通信W-CDMA自适应相干接收机，其特征在于由可控积分长度的匹配滤波器，信噪比测量器，自适应算法控制器，时分开关，自适应刷新时钟，残留频差测量器，取共轭器，乘法器组成，其中：2. A third-generation mobile communication W-CDMA adaptive coherent receiver, characterized in that by a matched filter with controllable integral length, a signal-to-noise ratio measuring device, an adaptive algorithm controller, a time-division switch, and an adaptive refresh clock , the residual frequency difference measurer is composed of a conjugator and a multiplier, where:A、下行链路自适应相干接收机中，主公共导频信道可控积分长度的匹配滤波器的输入是移动台的基带接收信号，输出分两支，一支和信噪比测量器相连，另一支和取共轭器相连，信噪比测量器的输出与自适应算法控制器的输入相连，业务信道的匹配滤波器输入是移动台的基带接收信号，输出和乘法器的输入相连，此乘法器的另一输入与取共轭器的输出相连，乘法器的输出与时分开关相连，时分开关的输出分两支，一支输出下行专用物理控制信道到残留频差测量器，另一支输出下行专用物理数据信道，即多比特用户数据流，残留频差测量器输出到自适应算法控制器，自适应算法控制器输出刷新的积分长度SFp到主公共导频信道可控积分长度的匹配滤波器，自适应刷新时钟输出三支，分别到信噪比测量器，残留频差测量器和自适应算法控制器；A. In the downlink adaptive coherent receiver, the input of the matched filter of the controllable integration length of the main common pilot channel is the baseband received signal of the mobile station, and the output is divided into two branches, one is connected with the signal-to-noise ratio measuring device, The other branch is connected with the conjugator, the output of the signal-to-noise ratio measuring device is connected with the input of the adaptive algorithm controller, the matched filter input of the traffic channel is the baseband receiving signal of the mobile station, and the output is connected with the input of the multiplier, The other input of this multiplier is connected with the output of the conjugator, and the output of the multiplier is connected with the time-division switch. The branch outputs the downlink dedicated physical data channel, that is, the multi-bit user data stream, and the residual frequency difference measurer outputs to the adaptive algorithm controller, and the adaptive algorithm controller outputs the refreshed integration length SFp to the controllable integration length of the main common pilot channel Matched filter, three adaptive refresh clock outputs, respectively to the signal-to-noise ratio measurer, residual frequency difference measurer and adaptive algorithm controller;B、上行链路自适应相干接收机中，上行专用物理控制信道可控积分长度的匹配滤波器的输入是基站的基带接收信号，输出分两支，一支和信噪比测量器相连，另一支和取共轭器相连，信噪比测量器的输出与自适应算法控制器的输入相连，上行专用物理数据信道的匹配滤波器输入是移动台的基带接收信号，输出和乘法器的输入相连，此乘法器的另一输入与取共轭器的输出相连，乘法器的输出与残留频差测量器的输入相连，并同时输出多比特用户数据流，残留频差测量器输出到自适应算法控制器，自适应算法控制器输出刷新的积分长度SFc到上行专用物理控制信道可控积分长度的匹配滤波器，自适应刷新时钟输出三支，分别到信噪比测量器，残留频差测量器和自适应算法控制器。B. In the uplink adaptive coherent receiver, the input of the matched filter with the controllable integration length of the uplink dedicated physical control channel is the baseband received signal of the base station, and the output is divided into two branches, one is connected with the signal-to-noise ratio measuring device, and the other is One is connected with the conjugator, the output of the signal-to-noise ratio measuring device is connected with the input of the adaptive algorithm controller, the input of the matched filter of the uplink dedicated physical data channel is the baseband receiving signal of the mobile station, and the output is the input of the multiplier The other input of the multiplier is connected to the output of the conjugator, the output of the multiplier is connected to the input of the residual frequency difference measurer, and simultaneously outputs a multi-bit user data stream, and the residual frequency difference measurer outputs to the adaptive Algorithm controller, adaptive algorithm controller outputs refreshed integration length SFc to matched filter with controllable integration length of uplink dedicated physical control channel, three adaptive refresh clock outputs, respectively to signal-to-noise ratio measuring device, residual frequency difference measurement Controller and Adaptive Algorithm Controller.3.如权利要求2所述的第三代移动通信W-CDMA自适应相干接收机，其特征在于取共轭器12也可被信道估计滤波器或环路滤波器代替。3. The third generation mobile communication W-CDMA adaptive coherent receiver as claimed in claim 2, characterized in that the conjugator 12 can also be replaced by a channel estimation filter or a loop filter.4.如权利要求2所述的第三代移动通信W-CDMA自适应相干接收机，其特征在于取共轭器22也可被信道估计滤波器或环路滤波器代替。4. The third generation mobile communication W-CDMA adaptive coherent receiver as claimed in claim 2, characterized in that the conjugator 22 can also be replaced by a channel estimation filter or a loop filter.5.如权利要求1所述的第三代移动通信W-CDMA自适应相干接收方法，其特征在于自适应算法控制器4中也可使用其它自适应算法代替梯度自适应算法。5. The third generation mobile communication W-CDMA adaptive coherent receiving method according to claim 1, characterized in that other adaptive algorithms can be used in the adaptive algorithm controller 4 to replace the gradient adaptive algorithm.6.如权利要求1所述的一种第三代移动通信W-CDMA自适应相干接收方法，其特征在于自适应算法控制器16中使用其它自适应算法代替梯度自适应算法。6. A third-generation mobile communication W-CDMA adaptive coherent receiving method according to claim 1, characterized in that other adaptive algorithms are used in the adaptive algorithm controller 16 to replace the gradient adaptive algorithm.7.如权利1要求所述的第三代移动通信W-CDMA自适应相干接收方法，其特征在于在移动台的基带接收信号中分离出多径信号，然后使用RAKE合并，在RAKE合并的每一支都使用了本发明中的W-CDMA下行链路的自适应相干接收方法的结构，最后将所有这些分支的多比特用户数据流相加，做为RAKE合并输出的用户数据流。7. The third generation mobile communication W-CDMA adaptive coherent receiving method as claimed in claim 1, characterized in that in the baseband received signal of the mobile station, the multipath signal is separated, and then RAKE is used to combine, and each step of the RAKE combination One branch uses the structure of the W-CDMA downlink adaptive coherent receiving method in the present invention, and finally adds the multi-bit user data streams of all these branches as the user data stream combined and outputted by RAKE.8.如权利要求1所述的一种第三代移动通信W-CDMA自适应相干接收方法，其特征在于其中门限可以都是固定的，或者可以都自适应调整，或者一部分是固定的，另一部分自适应调整。8. A third-generation mobile communication W-CDMA adaptive coherent receiving method as claimed in claim 1, wherein the thresholds can all be fixed, or can be adaptively adjusted, or a part is fixed, and the other Some adaptive adjustments.