CN101237632A - Signal downlink transmitting method and device - Google Patents
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- CN101237632A CN101237632ACNA2008100831122ACN200810083112ACN101237632ACN 101237632 ACN101237632 ACN 101237632ACN A2008100831122 ACNA2008100831122 ACN A2008100831122ACN 200810083112 ACN200810083112 ACN 200810083112ACN 101237632 ACN101237632 ACN 101237632A
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Abstract
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of signal downlink transmitting method and device, can be applied to the base station of code division multiple access (CDMA) system.
Background technology
CDMA (Code Division Multiple Access) is a kind of access mode based on spread spectrum communication, and this technology mainly is to utilize between the different user orthogonality of spreading code to distinguish the user.
In mobile communication, a uncertainty that characteristics are wireless environments of wireless channel, this is comprising different wireless fading channels, and these declines all can produce bigger influence to the reception and the demodulation of signal.At this influence, effectively one of solution is exactly that the transmitting power that promotes transmitter remedies these declines, to improve the power that receiver receives.
And another characteristics of wireless channel are multipath transmission, because the influence of surrounding buildings thing and landform, different paths and time delay will inevitably appear in radio wave propagation, and the signal that receiver is received occurs rising and falling and decline.At this problem, adopting diversity to merge reception technique is the method for highly effective opposing multipath fading, cdma system can adopt RAKE receiver to overcome the influence that the multipath transmission brings, thereby the multipath of eliminating part disturbs, simultaneously can also make full use of effective multipath signal, better demodulate signal, bring corresponding multipath gain, improve the receptivity of receiver.
Therefore, improving the simplest method of downlink quality is to increase the downlink signal energy, also can receive the stronger effective multipath of more signals simultaneously and suitably improve its multipath that brings gain, to reach the purpose that improves descending demodulation performance by the increase RAKE receiver.
Descending increase transmitting power can have higher requirement to the power amplifier of equipment, and down transmission diversity can improve descending performance simultaneously.But in the existing down transmission diversity, the corresponding increase equipment complexity of meeting in the process that realizes need could be used under the situation that terminal (for example, mobile phone) is supported simultaneously, therefore seldom adopts this transmit diversity for prior network device.
Fig. 1 is the schematic diagram according to the single-antenna transmission of correlation technique.As shown in fig. 1,, have only one road main collection emissionradio frequency unit 101, after it receives baseband signal, directly send to main collection antenna through radio frequency processing for downlink.Receiving terminal UE side also can only receive from the next signal of an antenna transmission.
Therefore, do not propose as yet at present can effectively carry out the diversity downlink to improve the technical scheme of signal receiving quality.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is to provide a kind of signal downlink transmitting case, and the diversity downlink realizes the big problem of difficulty in the correlation technique to solve.
According to embodiments of the invention, a kind of signal downlink transmitting method is provided, be applied to the base station of code division multiple access system, wherein, the base station comprises main collection emission radio frequency unit.
This method comprises: step S202, antenna amount according to the base station is provided with at least one the diversity emission radio frequency unit that is connected with main collection emission radio frequency unit in the base station, make the antenna of diversity emission radio frequency unit and main collection emission radio frequency unit and base station connect one to one; Step S204, the delay of configuration diversity emission radio frequency unit; Step S206 after main collection emission radio frequency unit receives baseband signal, informs diversity emission radio frequency unit with baseband signal; Step S208, main collection emission radio frequency unit downlink baseband signal, the baseband signal that diversity emission radio frequency unit is informed by main collection emission radio frequency unit according to pre-configured delay downlink.
Wherein, in step S206, main collection emission radio frequency unit informs that with baseband signal the processing of diversity emission radio frequency unit is specially: main collection emission radio frequency unit duplicates the designated parameter of baseband signal, and designated parameter is sent to diversity emission radio frequency unit.
And, in step S208, diversity emission radio frequency unit downlink is specially by the processing of the baseband signal that master's collection emission radio frequency unit is informed: diversity emission radio frequency unit is determined baseband signal according to the designated parameter that receives, and the definite baseband signal of downlink.
Wherein, designated parameter one of comprises at least: amplitude information, phase information.
In addition, under the situation that is provided with a plurality of diversity emission radio frequency units, in step S204, dispose the delay of each diversity emission radio frequency unit respectively, wherein, the delay of a plurality of diversity emission radio frequency units is same to each other or different to each other.
In addition, the size of above-mentioned delay is n * m, and wherein, m is a chip lengths, and n is the integer more than or equal to zero, and wherein, for different diversity emission radio frequency units, n gets identical value or different value.
According to another embodiment of the present invention, provide a kind of signal downlink emitter, be applied to the base station of code division multiple access system, wherein, the base station comprises main collection emission radio frequency unit.
This device comprises: first configuration module, be used at least one the diversity emission radio frequency unit that is connected with main collection emission radio frequency unit being set in the base station, make the antenna of diversity emission radio frequency unit and main collection emission radio frequency unit and base station connect one to one according to the antenna amount of base station; Second configuration module, the delay that is used to dispose each diversity emission radio frequency unit;
Wherein, main collection emission radio frequency unit is used for receiving baseband signal, and baseband signal is informed diversity emission radio frequency unit, and the downlink baseband signal; Diversity emission radio frequency unit is connected with main collection emission radio frequency unit, is used for the baseband signal of being informed by main collection emission radio frequency unit according to pre-configured delay downlink.
This device can further comprise: the parameter sending module is used to duplicate the designated parameter of baseband signal, and designated parameter is sent to diversity emission radio frequency unit.
And this device can further comprise: determination module is used for determining baseband signal according to the designated parameter that is received by diversity emission radio frequency unit.
Wherein, above-mentioned designated parameter one of can comprise at least: amplitude information, phase information.
By technique scheme of the present invention, can strengthen down transmitting power, power gain when improving received signal and multipath gain, thus improve descending demodulation performance, the decline of effectively resisting wireless channel; And, can very significantly improve descending demodulation performance for the cell edge area, thereby enlarge descending coverage, also be applicable to the application of aspects such as super covering far away.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that carries out the downstream signal emission according to the employing single antenna of correlation technique;
Fig. 2 is the flow chart according to the signal downlink transmitting method of the inventive method embodiment;
Fig. 3 is the flow chart according to the processing example of the method for the inventive method embodiment;
Fig. 4 is the schematic diagram that is applied to dual-antenna system according to the method for the inventive method embodiment;
Fig. 5 is the schematic diagram that is applied to two above antenna systems according to the method for the inventive method embodiment; And
Fig. 6 is the block diagram according to the signal downlink emitter of apparatus of the present invention embodiment.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing.
Method embodiment
In the present embodiment, provide a kind of signal downlink transmitting method, be applied to the base station of code division multiple access system, wherein, the base station comprises main collection emission radio frequency unit.
As shown in Figure 2, comprise according to the present embodiment signal downlink transmitting method: step S202, antenna amount according to the base station is provided with at least one the diversity emission radio frequency unit that is connected with main collection emission radio frequency unit in the base station, make the antenna of diversity emission radio frequency unit and main collection emission radio frequency unit and base station connect one to one; Step S204, the delay of configuration diversity emission radio frequency unit; Step S206 after main collection emission radio frequency unit receives baseband signal, informs diversity emission radio frequency unit with baseband signal; Step S208, main collection emission radio frequency unit downlink baseband signal, the baseband signal that diversity emission radio frequency unit is informed by main collection emission radio frequency unit according to pre-configured delay downlink.
Wherein, in step S206, main collection emission radio frequency unit informs that with baseband signal the processing of diversity emission radio frequency unit is specially: main collection emission radio frequency unit duplicates the designated parameter of baseband signal, and designated parameter is sent to diversity emission radio frequency unit.
And, in step S208, diversity emission radio frequency unit downlink is specially by the processing of the baseband signal that master's collection emission radio frequency unit is informed: diversity emission radio frequency unit is determined baseband signal according to the designated parameter that receives, and the definite baseband signal of downlink.
Wherein, designated parameter one of comprises at least: amplitude information, phase information.
In addition, under the situation that is provided with a plurality of diversity emission radio frequency units, in step S204, dispose the delay of each diversity emission radio frequency unit respectively, wherein, the delay of a plurality of diversity emission radio frequency units is same to each other or different to each other.
In addition, the size of above-mentioned delay is n * m, and wherein, m is a chip lengths, and n is the integer more than or equal to zero, and wherein, for different diversity emission radio frequency units, n gets identical value or different value.
As can be seen, this method is provided with diversity emission radio frequency unit at the quantity of antenna.
As shown in Figure 3, when reality realized, processing procedure was as follows:
(1) base station equipment is installed and is disposed corresponding diversity emission radio frequency unit.
(2) main collection emission radio frequency unit obtains that base band sends here transmit after, judge whether to dispose the radio frequency unit that has diversity, if exist, then will lead the collection baseband signal and be distributed to diversity, the normal transmission of main simultaneously collection; Otherwise do not carry out the diversity emission, processing finishes;
(3) after diversity signal obtains corresponding data,, select the certain transmission delay of configuration, send then according to different situations.
Fig. 4 is the schematic diagram that carries out downlink when applying the present invention to dual-antenna system.Compare with downlink situation shown in Figure 1, it has mainly increased by one tunnel diversity emissionradio frequency unit 402 and inner time delay processing (module) 403 thereof, wherein, this diversity emissionradio frequency unit 402 is connected with main collection emissionradio frequency unit 401, and comprise systems such as power amplifier required in the emission process, antenna feeder, simultaneously for having certain path to carry out corresponding data interaction between the main diversity radio frequency unit.
Fig. 5 is the schematic diagram that carries out downlink when applying the present invention to two above antenna systems.Wherein, mainly be a plurality of diversity emission radio frequency units of configuration and respective delay thereof, and carry out respective delay operation and transmission.
The first step is added the corresponding diversity emission of configuration radio frequency unit.Wherein, to comprise complete ballistic device in each radio frequency unit of increase, could guarantee effective transmission of diversity signal like this, simultaneously, the emission radio frequency unit of diversity also will and the radio frequency unit of main collection have certain path to guarantee exchanges data between it.If the improperly-configured of step 1, then the operation of back all can't normally move, and can not finish descending emission enhancement function.
In second step, main collection emission radio frequency unit is confirmed the existence of diversity emission radio frequency unit after receiving the baseband signal that base band sends here, if configuration exists the baseband signal copy that receives is distributed to diversity emission radio frequency unit.Wherein comprised the information such as amplitude-phase of data in the copies data, and guaranteed that main diversity transmission signal is identical.
The 3rd step, after diversity emission radio frequency unit obtains the baseband signal of main collection distribution, to send signal delay one fixed response time according to concrete configuration, can (n can be set to 0 equally here for n chip (chip), that is, do not postpone, at this moment, just complete synchronized transmission between the main diversity), the signal after the delay will be passed to diversity antenna and send.
In the first step, need every antenna configurations is launched radio frequency unit accordingly, the baseband signal that just will lead the collection transmission in second step copies respectively to each emission radio frequency unit, and each radio frequency unit carries out respective delay ni chip respectively after receiving signal, and passing to separately then, antenna sends.Wherein, need decide according to actual conditions for the delay configuration of each diversity emission radio frequency unit, its concrete configuration method is not in discussion scope of the present invention.
Signal according to the top-operation transmission, terminal such as mobile phone can receive the signal that sends on each antenna when receiving, and receive and have certain time delay between the most powerful path on each antenna, like this, not only strengthened the signal energy that receives, also can bring bigger multipath gain simultaneously, can better resist the loss of signal that deep fade causes recipient's RAKE receiver, can the descending demodulation quality of more effective raising.
Device embodiment
In the present embodiment, provide a kind of signal downlink emitter, be applied to the base station of code division multiple access system, wherein, the base station comprises main collection emission radio frequency unit.
As shown in Figure 6, signal downlink emitter according to present embodiment comprises:first configuration module 602, be used at least one the diversity emission radio frequency unit that is connected with main collection emission radio frequency unit being set in the base station, make the antenna of diversity emission radio frequency unit and main collection emission radio frequency unit and base station connect one to one according to the antenna amount of base station;Second configuration module 604, the delay that is used to dispose each diversity emission radio frequency unit;
Wherein, main collection emission radio frequency unit is used for receiving baseband signal, and baseband signal is informed diversity emission radio frequency unit, and the downlink baseband signal; Diversity emission radio frequency unit is connected with main collection emission radio frequency unit, is used for the baseband signal of being informed by main collection emission radio frequency unit according to pre-configured delay downlink.
This device can further comprise: the parameter sending module is used to duplicate the designated parameter of baseband signal, and designated parameter is sent to diversity emission radio frequency unit.
And this device can further comprise: determination module is used for determining baseband signal according to the designated parameter that is received by diversity emission radio frequency unit.
Wherein, above-mentioned designated parameter one of can comprise at least: amplitude information, phase information.
The present invention has introduced two kinds of different modes and has improved descending performance, promptly, transmit and strengthen down transmitting power by increasing descending diversity, and introduce transmission delay between the descending main diversity, that is, introduce suitable multipath skew, can make mobile phone when receiving signal demodulation, can not only obtain the gain on the power, also can bring simultaneously bigger multipath gain, improve descending demodulation performance, thus the decline of more effective opposing wireless channel.And, can very significantly improve descending demodulation performance for the cell edge area, thereby enlarge descending coverage, also be applicable to the application of aspects such as super covering far away.
When the reality realization is of the present invention, can also adjust the time delay skew of downlink flexibly, adapting to different environment, and the present invention do not have too much to increase the complexity of transmitting terminal and receiving terminal, especially do not need UE side corresponding modification and makes this invention applicable surface wider.This invention can also expand in many antenna emissions simultaneously, also can strengthen descending power with it to descending many antenna emissions, improves the multipath gain.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. signal downlink transmitting method is applied to the base station of code division multiple access system, and wherein, described base station comprises main collection emission radio frequency unit, it is characterized in that described method comprises:
Step S202, antenna amount according to described base station is provided with at least one the diversity emission radio frequency unit that is connected with described main collection emission radio frequency unit in described base station, make the antenna of described diversity emission radio frequency unit and described main collection emission radio frequency unit and described base station connect one to one;
Step S204, the delay of disposing described diversity emission radio frequency unit;
Step S206 after described main collection emission radio frequency unit receives baseband signal, informs described diversity emission radio frequency unit with described baseband signal;
Step S208, the described baseband signal of described main collection emission radio frequency unit downlink, the described baseband signal that described diversity emission radio frequency unit is informed by described main collection emission radio frequency unit according to pre-configured described delay downlink.
2. method according to claim 1 is characterized in that, in described step S206, described main collection emission radio frequency unit informs that with described baseband signal the processing of described diversity emission radio frequency unit is specially:
Described main collection emission radio frequency unit duplicates the designated parameter of described baseband signal, and described designated parameter is sent to described diversity emission radio frequency unit.
3. method according to claim 2 is characterized in that, in described step S208, described diversity emission radio frequency unit downlink is specially by the processing of the described baseband signal that described main collection emission radio frequency unit is informed:
Described diversity emission radio frequency unit is determined described baseband signal according to the described designated parameter that receives, and the definite described baseband signal of downlink.
4. according to claim 2 or 3 described methods, it is characterized in that described designated parameter one of comprises at least: amplitude information, phase information.
5. according to each described method in the claim 1 to 3, it is characterized in that, under the situation that is provided with a plurality of described diversity emission radio frequency units, in described step S204, dispose the delay of each diversity emission radio frequency unit respectively, wherein, the delay of described a plurality of diversity emission radio frequency units is same to each other or different to each other.
6. according to each described method in the claim 1 to 3, it is characterized in that the size of described delay is n * m, wherein, m is a chip lengths, and n is the integer more than or equal to zero, and wherein, for different diversity emission radio frequency units, n gets identical value or different value.
7. signal downlink emitter is applied to the base station of code division multiple access system, and wherein, described base station comprises main collection emission radio frequency unit, it is characterized in that described device comprises:
First configuration module, be used at least one the diversity emission radio frequency unit that is connected with described main collection emission radio frequency unit being set in described base station, make the antenna of described diversity emission radio frequency unit and described main collection emission radio frequency unit and described base station connect one to one according to the antenna amount of described base station;
Second configuration module, the delay that is used to dispose each described diversity emission radio frequency unit;
Wherein, described main collection emission radio frequency unit is used for receiving baseband signal, and described baseband signal is informed described diversity emission radio frequency unit, and the described baseband signal of downlink; Described diversity emission radio frequency unit is connected with described main collection emission radio frequency unit, is used for the described baseband signal of being informed by described main collection emission radio frequency unit according to pre-configured described delay downlink.
8. device according to claim 7 is characterized in that, further comprises:
The parameter sending module is used to duplicate the designated parameter of described baseband signal, and described designated parameter is sent to described diversity emission radio frequency unit.
9. device according to claim 8 is characterized in that, further comprises:
Determination module is used for determining described baseband signal according to the described designated parameter that is received by described diversity emission radio frequency unit.
10. according to Claim 8 or 9 described devices, it is characterized in that described designated parameter one of comprises at least: amplitude information, phase information.
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| CNA2008100831122ACN101237632A (en) | 2008-03-03 | 2008-03-03 | Signal downlink transmitting method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100831122ACN101237632A (en) | 2008-03-03 | 2008-03-03 | Signal downlink transmitting method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386952A (en)* | 2010-08-30 | 2012-03-21 | 中兴通讯股份有限公司 | Method for delaying diversity transmission and programmable logic device |
| CN102412882A (en)* | 2011-08-22 | 2012-04-11 | 中兴通讯股份有限公司 | Signal transmitting method and device |
| CN111180902A (en)* | 2020-02-13 | 2020-05-19 | 惠州Tcl移动通信有限公司 | MIMO system, method for distinguishing signals by MIMO system and mobile terminal thereof |
| CN111313940A (en)* | 2020-02-12 | 2020-06-19 | 惠州Tcl移动通信有限公司 | MIMO system and method for distinguishing signals of MIMO system |
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| US5574989A (en)* | 1993-04-26 | 1996-11-12 | Hughes Electronics | Time division multiple access cellular communication system and method employing base station diversity transmission |
| CN101057416A (en)* | 2004-10-07 | 2007-10-17 | 意大利电信股份公司 | Variable delay transmit diversity |
- 2008
- 2008-03-03CNCNA2008100831122Apatent/CN101237632A/enactivePending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5574989A (en)* | 1993-04-26 | 1996-11-12 | Hughes Electronics | Time division multiple access cellular communication system and method employing base station diversity transmission |
| CN101057416A (en)* | 2004-10-07 | 2007-10-17 | 意大利电信股份公司 | Variable delay transmit diversity |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386952A (en)* | 2010-08-30 | 2012-03-21 | 中兴通讯股份有限公司 | Method for delaying diversity transmission and programmable logic device |
| CN102412882A (en)* | 2011-08-22 | 2012-04-11 | 中兴通讯股份有限公司 | Signal transmitting method and device |
| WO2012151891A1 (en)* | 2011-08-22 | 2012-11-15 | 中兴通讯股份有限公司 | Signal transmission method and device |
| CN111313940A (en)* | 2020-02-12 | 2020-06-19 | 惠州Tcl移动通信有限公司 | MIMO system and method for distinguishing signals of MIMO system |
| CN111313940B (en)* | 2020-02-12 | 2022-05-06 | 惠州Tcl移动通信有限公司 | MIMO system and method for distinguishing signals of MIMO system |
| CN111180902A (en)* | 2020-02-13 | 2020-05-19 | 惠州Tcl移动通信有限公司 | MIMO system, method for distinguishing signals by MIMO system and mobile terminal thereof |
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