CN101667845B - Self-adapting combination method and self-adapting combination system for multi-channel signals - Google Patents
Self-adapting combination method and self-adapting combination system for multi-channel signals Download PDFInfo
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Abstract
The invention discloses a self-adapting incorporative method and a self-adapting incorporative method system for multi-channel signals, which are applied to a global system for mobile communications GSM and/or an enhanced data rate GSM evolution system. The method comprises the following steps: estimating a single carrier-to-interference ratio before an interference restraint incorporation IRC and the carrier-to-interference ratio after the IRC incorporation according to a plurality of received baseband signals; acquiring the estimation value of a carrier-to-interference ratio gain of the IRC according to the single carrier-to-interference ratio and the carrier-to-interference ratio after the incorporation; and judging whether the estimation value is greater than a predetermined threshold or not, if so, performing the IRC incorporation of the plurality of received baseband signals, otherwise, performing a maximum ratio incorporation MRC of the plurality of received baseband signals. Technical scheme provided by the invention can judge correctly in a large range of the carrier-to-interference ratio, thereby ensuring the optimal incorporation of the plurality of signals.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of multiple signals self adaptation merging method and device.
Background technology
At present, second generation mobile cellular communication system-Global Communications System (Global Systemfor Mobile Communication is referred to as GSM) is widely applied in worldwide.Ever-increasing to the demand of high-speed data service and the demand of whole Communications Market in order to satisfy people, strengthen the competitiveness of existing system, (the Telecommunications Industry of Telecommunications Industries Association, referred to as TIA) and the European Telecommunication Standard chemistry can unite proposed a kind of based on time division multiple access (Time Division Multiple Access, referred to as TDMA) wireless access technology-enhanced data rates for gsm class hour technology (Enhanced Data Rates for GSM Revolution, referred to as EDGE), EDGE provides data communication service at a high speed with existing GSM frequency range, and, in order in existing cellular system, to provide higher data communication rates, EDGE has introduced octaphase-shift keying (8Phase Shift Keying is referred to as 8PSK) modulation system.
For the GSM/EDGE system, the signal that transmitter sends not only can be subject to the impact of multipath channel, but also can be subject to the impact of co-channel interference, in order to reduce the interference of the signal that receives, can a plurality of antennas be set at receiving terminal, perhaps, by carrying out to received signal over-sampling to disturb inhibition, carry out equalizing demodulation to disturbing the signal after suppressing.
At present, disturbance restraining method commonly used has the inhibition of interference to merge (InterferenceRejection Combing, referred to as IRC) and high specific merging (Maximum RatioCombing, referred to as MRC), IRC can well suppress to disturb, and compares its interference free performance with MRC and is greatly improved; But IRC performance under glitch-free noise limited environment will be worse than MRC.
Prior art one has proposed the merging method of multiple signals, the method is at first calculated the ratio of the cross-correlation coefficient of variance minimum in the correlation matrix and minimum, then by this ratio and the thresholding of being scheduled to are compared, if this ratio surpasses this thresholding, then cross-correlation coefficient is decayed with this Ratio index level, carry out follow-up IRC with the correlation matrix after the decay and process.
Prior art two has proposed a kind of for each burst that receives, and calculates the ratio of interference and noise variance and whole reception signal energies and determines that current is interference-limited or the noise limited environment.
Although prior art one can improve the performance that the IRC under glitch-free noise limited environment processes, but still do not reach the performance that MRC processes; Prior art two is when carrier/interface ratio is low, and channel estimation errors is larger, and the noise variance of calculating is not accurate enough, thereby can cause misjudgment.
Summary of the invention
In view of this, the present invention proposes a kind of multiple signals self adaptation merging method, can't carry out the optimum problem that merges of multiple signals for concrete environment to solve in the prior art.
According to an aspect of the present invention, provide a kind of multiple signals self adaptation merging method, the method is applied to GSM and/or enhanced data rates for gsm evolution system.
Multiple signals self adaptation merging method according to the present invention comprises: according to the multichannel baseband signal that receives, estimate that interference suppresses to merge IRC single channel carrier/interface ratio and IRC before and merges carrier/interface ratio afterwards; According to the carrier/interface ratio after single channel carrier/interface ratio and the merging, obtain the estimated value of the carrier/interface ratio gain of IRC; Judge that estimated value whether greater than default thresholding, is in the situation that is in judged result, the multichannel baseband signal that receives is carried out IRC merge; Otherwise, the multichannel baseband signal that receives is carried out MRC merges.
According to another aspect of the present invention, provide a kind of multiple signals self adaptation to merge device, this application of installation is in GSM and/or enhanced data rates for gsm evolution system.
Merging device according to multiple signals self adaptation of the present invention comprises: estimation module, acquisition module, judge module and merging module.Wherein, estimation module is used for according to the multichannel baseband signal that receives, and estimation interference inhibition merges single channel carrier/interface ratio and the IRC merging carrier/interface ratio afterwards before the IRC; Carrier/interface ratio after single channel carrier/interface ratio before the IRC that acquisition module is used for estimating according to estimation module and IRC merge is obtained the estimated value of the carrier/interface ratio gain of IRC; Whether the estimated value that the carrier/interface ratio that acquisition module calculates of being used for judge module judging gains is greater than default thresholding; Merge module for the result who judges according to judge module, select IRC or high specific to merge MRC the multichannel baseband signal that receives is carried out merging.
By above-mentioned at least one technical scheme of the present invention, estimate to select the mode that merges by calculating carrier/interface ratio gain that IRC merges, than prior art, can in very large carrier/interface ratio scope, judge soundly, thereby the optimum that has guaranteed multiple signals merges.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the basic schematic diagram of gsm system transceiver;
Fig. 2 is the data format schematic diagram of conventional burst and access burst in the EDGE system;
Fig. 3 is the flow chart according to the multiple signals self adaptation merging method of the embodiment of the invention;
Fig. 4 is the specific implementation flow chart of the multiple signals self adaptation merging method of the embodiment of the invention;
Fig. 5 A is the structural representation that merges device according to the multiple signals self adaptation of the embodiment of the invention;
Fig. 5 B is that the multiple signals self adaptation merges the structural representation of device according to the preferred embodiment of the invention.
Embodiment
As mentioned above, the present invention is directed at present and can't carry out the optimum problem that merges of multiple signals for concrete environment, a kind of multiple signals self adaptation Merge Scenarios has been proposed, this scheme is by the carrier/interface ratio after estimating IRC merging single channel carrier/interface ratio before and merging, obtain the estimated value of the carrier/interface ratio gain of IRC, according to the magnitude relationship of this estimated value and given thresholding, select suitable merging method again, the multichannel baseband signal is merged.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
For the ease of understanding, the below at first by reference to the accompanying drawings 1 and Fig. 2 respectively the data format of conventional burst and access burst pulse in the operation principle of gsm system transceiver and the EDGE system is carried out brief description.
Fig. 1 is the basic schematic diagram of gsm system transceiver, as shown in Figure 1, after the data of transmitting end channel coding module 101 outputs are sent into interleaving block 102 processing, via baseband modulation module 103, this module is sent into wireless channel after the data of input are carried out GMSK or 8PSK modulation, up-converter module 104 and transmitting antenna 105; At receiving terminal, the signal that multichannel or single channel reception antenna 106 are received is after down conversion module 107, obtain the baseband signal of single-time sampling or over-sampling, this baseband signal is sent into respectively signal demodulation module 110 and Timing Advance (Time Advance, referred to as TA) and channel parameter estimation module 108, module 108 will estimate channel parameter and send into merging module 109, after 109 pairs of multiple signals that receive of merging module merge, signal after merging is outputed to signal demodulation module 110, signal after signal demodulation module 110 modules are combined carries out demodulation, demodulation result is sent into de-interleaving block 111, and 112 outputs of final channel decoder module.
Fig. 2 is the data format schematic diagram of conventional burst and access burst in the EDGE system, and as shown in Figure 2, for conventional burst (Normal Burst is referred to as NB), its information data is divided into two groups of each 58 symbols.Inserted the training sequence of 26 (bit) between this two segment data, wherein the beginning and end of this 26bit respectively has 5bit to protect the interval, and middle 16bit data are used for estimating channel parameter and Timing Advance.3 tail bit " 0 " are added on the both sides of useful information section.The last of NB data is the time of 8.25bit, do not send out signal any, as the protection section of adjacent time-slots.
Based on said GSM system transceiver and data format, according to the embodiment of the invention, at first provide a kind of multiple signals self adaptation merging method, the method is applied to gsm system and/or EDGE system.
Fig. 3 is the flow chart according to the multiple signals self adaptation merging method of the embodiment of the invention, as shown in Figure 3, mainly comprises following processing (step S301-step S309) according to the multiple signals self adaptation merging method of the embodiment of the invention:
Step S301: according to the multichannel baseband signal that receives, estimate that interference suppresses to merge IRC single channel carrier/interface ratio and IRC before and merges carrier/interface ratio afterwards;
Step S303: according to the carrier/interface ratio after above-mentioned single channel carrier/interface ratio and the above-mentioned merging, obtain the estimated value of the carrier/interface ratio gain of IRC;
Step S305: judge that the estimated value of above-mentioned carrier/interface ratio gain of obtaining whether greater than default thresholding, if so, then enters step S307, otherwise, carry out step S309;
Step S307: the multichannel baseband signal that receives is carried out IRC merge;
Step S309: the multichannel baseband signal that receives is carried out MRC merge.
Below further describe each details of above-mentioned processing.
(1) step S301
In this step, the carrier/interface ratio after the single channel carrier/interface ratio of obtaining the multichannel baseband signal that receives and IRC merging at first will be processed the multiple signals that receive, and particularly, step S301 can may further comprise the steps:
Step 1: the multichannel baseband signal that receives is carried out the symbol despining.
The signal that the multichannel of receiving terminal or single channel reception antenna 106 receive carries out sign-inverted to the every road signal that receives after down conversion module 107.
Step 2: the channel parameter estimation and the TA that calculate respectively through the every roadbed band signal after the despining estimate.
Step 3: according to channel parameter estimation and the Timing Advance of multichannel baseband signal, determine the estimated value of noise covariance matrix and IRC single channel carrier/interface ratio before.
Take a two-way diversity system as example, suppose wherein one road signal that moment k receives be x (k) (in the present embodiment, training sequence in the signal that receives is calculated as receiving signal), the signal that sends is s (k), the interference signal and the noise that receive from other travelling carriage are I (k), then have:
x(k)＝Hs(k)+I(k) (1)
In the formula, H is the channel impulse response of j tap;
Covariance matrix R
UuCan utilize training sequence Y (this training sequence is the training sequence of presetting, i.e. the training sequence of receiving terminal and transmitting terminal agreement) to estimate by formula 2:
According to the covariance matrix R that obtains
Uu, the definable channel estimate matrix:
Then the reception of the single channel before IRC carrier/interface ratio is estimated as:
Step 4: according to the channel parameter estimation of above-mentioned noise covariance matrix and multichannel baseband signal, determine that IRC merges the estimated value of carrier/interface ratio afterwards.
Take above-mentioned two-way diversity system as example, the carrier/interface ratio after the IRC is estimated as:
(2) step S303
In concrete implementation process, the estimated value of the carrier/interface ratio of IRC gain is:
CIR-improve＝CIR-est2—CIR-est1 (5)
(3) step S305
In this step, estimated value CIR-improve and the default thresholding of the carrier/interface ratio obtained among step S303 gain compared, thereby determine selection IRC or MRC merges.
Wherein, default thresholding can arrange according to the utilization of reality, is an empirical value, because of the way of the baseband signal that receives different different.
(4) step S307
When the estimated value of carrier/interface ratio gain during greater than default thresholding, illustrate and disturbs greatlyr in the current environment that use IRC merging method to merge and can obtain larger gain, therefore, employing IRC merges the multichannel baseband signal that receives.
(5) step S309
When the estimated value of carrier/interface ratio gain is less than or equal to default thresholding, illustrate in the current environment almost noiselessly, use IRC merging method to merge and can not obtain larger gain, therefore, employing MRC merges the multichannel baseband signal that receives.
After the multichannel baseband signal that receives was merged, with the signal input signal demodulation module 110 after merging, the signal after being combined carried out demodulation, then through de-interleaving block 111 and channel decoding module 112 outputs.
Said method by the embodiment of the invention provides can for the method for specific environment self adaptation adjustment merging, can guarantee optimum merging in the maximum magnitude.
Below in conjunction with Fig. 1 the specific implementation process of the multiple signals self adaptation merging method of embodiment of the invention proposition is described.
Fig. 4 is the specific implementation flow chart of the multiple signals self adaptation merging method of embodiment of the invention proposition, as shown in Figure 4, mainly may further comprise the steps:
Step S401: each road signal that multichannel or single channel reception antenna 106 receive, and with each road signal input down conversion module 107;
Step S403: down conversion module 107 each road signal of output are carried out the symbol despining, and with the input TA of the signal after the despining and channel parameter estimation module 108;
Channel parameter estimation and TA that step S405:TA and channel parameter estimation module 108 are calculated respectively each the road signal after the despining estimate, and will calculate channel parameter estimation and TA estimation and each road signal input merging module 109 of gained;
Step S407: merge module 109 and utilize formula (2) calculating noise variance matrix R;
Step S409: merge module 109 and utilize formula (3) to calculate IRC reception carrier interference ratio C/I R-est1 before;
Step S411: merge the carrier interference ratio C/I R-est2 after module 109 is utilized formula (4) calculating IRC;
Above-mentioned steps S401-step S411 is corresponding to the step S301 among Fig. 3;
Step S413: merge module 109 and utilize formula (5) to calculate the carrier/interface ratio gain CIR-improve of IRC, this step is corresponding to the step S303 among Fig. 3;
Step S415: merge module 109 and judge that CIR-improve whether greater than thresholding Th, if so, then enters step S417, carry out IRC and merge, otherwise enter step S419, carry out MRC and merge, this step is corresponding to the step S305 among Fig. 3;
Step S417: each the road signal that merges 109 pairs of inputs of module carries out IRC and merges, corresponding to the step S307 among Fig. 3;
Step S419: each the road signal that merges 109 pairs of inputs of module carries out MRC and merges, corresponding to the step S309 among Fig. 3;
Step S421: the signal after being combined carries out follow-up demodulation process.
According to the embodiment of the invention, also provide a kind of multiple signals self adaptation to merge device, be applied to gsm system and/or EDGE system, this device can be realized above-mentioned multiple signals self adaptation merging method.
Fig. 5 A is the structural representation that merges device according to the multiple signals self adaptation of the embodiment of the invention, Fig. 5 B is that the multiple signals self adaptation merges the structural representation of device according to the preferred embodiment of the invention, shown in Fig. 5 A, merge device according to the multiple signals self adaptation of the embodiment of the invention and comprise: estimation module 51, acquisition module 53, judge module 55 and merge module 57.Further describe above-mentioned modules below in conjunction with accompanying drawing.
Estimation module 51 is used for according to the multichannel baseband signal that receives, the carrier/interface ratio after the single channel carrier/interface ratio before the estimation IRC and IRC merge;
Acquisition module 53 is connected with estimation module 51, and the carrier/interface ratio after the single channel carrier/interface ratio before the IRC that is used for estimating according to estimation module and IRC merge is obtained the estimated value of the carrier/interface ratio gain of IRC;
Judge module 55 is connected with acquisition module 53, is used for judging that whether estimated value that carrier/interface ratio that acquisition module calculates gains is greater than default thresholding;
Merge module 57 and be connected with judge module 55, be used for the result according to judge module 55 judgements, select IRC or MRC that the multichannel baseband signal that receives is carried out and merge.
Particularly, shown in Fig. 5 B, estimation module 51 can comprise: gyrator module 511, calculating sub module 513, first are determined submodule 515 and second definite submodule 517.Wherein, gyrator module 511 is used for the respectively DO symbol despining operation of multichannel baseband signal to receiving; Calculating sub module 513 is connected with gyrator module 511, is used for calculating respectively channel parameter estimation and Timing Advance through the multichannel baseband signal after the despining; First determines that submodule 515 is connected with calculating sub module 513, is used for channel parameter estimation and Timing Advance according to the multichannel baseband signal of calculating sub module 513 calculating, determines the estimated value of noise covariance matrix and IRC single channel carrier/interface ratio before; Second determines that submodule 517 is connected with calculating sub module with the first definite submodule 515 is connected, be used for determining the noise covariance matrix that submodule 515 is determined according to first, the channel parameter estimation of the multichannel baseband signal that calculating sub module 513 is calculated determines that IRC merges the estimated value of carrier/interface ratio afterwards.
According to the said apparatus that the embodiment of the invention provides, can select adaptively the merging method that the multichannel baseband signal is merged according to actual conditions.
As mentioned above, the technique scheme that provides by the embodiment of the invention, can be according to the multichannel baseband signal that receives, estimate that single channel carrier/interface ratio and IRC before carrying out IRC merges merge carrier/interface ratio afterwards, thereby obtain carrying out the gain of the carrier/interface ratio that IRC merges, according to this gain, can judge and select IRC or MRC merges the multichannel baseband signal that receives, therefore, can in very large carrier/interface ratio scope, judge soundly, carry out the optimum merging of multiple signals thereby reach according to concrete environment.
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 modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a multiple signals self adaptation merging method is applied to global system for mobile communications GSM and/or enhanced data rates for gsm evolution system, it is characterized in that described method comprises:
According to the multichannel baseband signal that receives, estimate that interference suppresses to merge IRC single channel carrier/interface ratio and IRC before and merges carrier/interface ratio afterwards;
According to the carrier/interface ratio after described single channel carrier/interface ratio and the described merging, obtain the estimated value of the carrier/interface ratio gain of IRC;
Judge that described estimated value whether greater than default thresholding, is in the situation that is in judged result, the described multichannel baseband signal that receives is carried out IRC merge; Otherwise,
The described multichannel baseband signal that receives is carried out high specific merge the MRC merging;
Wherein, the estimated value of described carrier/interface ratio gain is carrier/interface ratio after the described merging and the difference between the described single channel carrier/interface ratio.
2. method according to claim 1 is characterized in that, the carrier/interface ratio after the single channel carrier/interface ratio before the described estimation IRC and IRC merge specifically comprises:
The described multichannel baseband signal that receives is carried out respectively the symbol despining;
Calculate respectively channel parameter estimation and Timing Advance through the described multichannel baseband signal after the despining;
According to channel parameter estimation and the Timing Advance of described multichannel baseband signal, determine the estimated value of noise covariance matrix and IRC single channel carrier/interface ratio before;
According to the channel parameter estimation of described noise covariance matrix and described multichannel baseband signal, determine that IRC merges the estimated value of carrier/interface ratio afterwards.
3. method according to claim 2 is characterized in that, described definite noise covariance matrix specifically comprises:
According to described Timing Advance, extract respectively the training sequence x in the described multichannel baseband signal
i, wherein, i=1,2 ...., n, n are the way of the baseband signal that receives;
Channel parameter estimation according to described multichannel baseband signal
Training sequence x in default training sequence Y and the described multichannel baseband signal of extraction
i, determine described noise covariance matrix
4. method according to claim 3 is characterized in that, the carrier/interface ratio after described definite IRC merges specifically comprises:
Utilize the channel parameter estimation of described multichannel baseband signal, the structure channel estimate matrix
Wherein, j is the footpath that every roadbed band signal comprises;
According to described channel estimate matrix
With described noise covariance matrix R
Uu, determine that IRC merges carrier/interface ratio afterwards
5. method according to claim 3 is characterized in that, the estimated value of the single channel carrier/interface ratio before described definite IRC comprises:
Utilize the channel parameter estimation of described multichannel baseband signal, the structure channel estimate matrix
Wherein, n is the way of the baseband signal that receives;
Training sequence x according to the every roadbed band signal that receives
i, default training sequence Y and described channel estimate matrix are determined IRC single channel carrier/interface ratio before
6. method according to claim 1 is characterized in that, the empirical value that described default thresholding arranges for the utilization according to reality.
7. a multiple signals self adaptation merges device, is applied to global system for mobile communications GSM and/or enhanced data rates for gsm evolution system, it is characterized in that described device comprises:
Estimation module is used for according to the multichannel baseband signal that receives, and estimation interference inhibition merges single channel carrier/interface ratio and the IRC merging carrier/interface ratio afterwards before the IRC;
Acquisition module, the carrier/interface ratio after the single channel carrier/interface ratio before the IRC that is used for estimating according to described estimation module and IRC merge is obtained the estimated value of the carrier/interface ratio gain of IRC;
Judge module, whether the estimated value of the described carrier/interface ratio gain that is used for judging that described acquisition module calculates is greater than default thresholding;
Merge module, be used for the result according to described judge module judgement, select IRC or high specific merging MRC that the described multichannel baseband signal that receives is carried out and merge;
Wherein, the estimated value of described carrier/interface ratio gain is carrier/interface ratio after the described merging and the difference between the described single channel carrier/interface ratio.
8. device according to claim 7 is characterized in that, described estimation module specifically comprises:
The gyrator module is used for the respectively DO symbol despining operation of described multichannel baseband signal to receiving;
Calculating sub module is used for calculating respectively channel parameter estimation and Timing Advance through the described multichannel baseband signal after the despining;
First determines submodule, is used for channel parameter estimation and Timing Advance according to the described multichannel baseband signal of described calculating sub module calculating, determines the estimated value of noise covariance matrix and IRC single channel carrier/interface ratio before;
Second determines submodule, for the described noise covariance matrix of determining according to described first definite submodule, and the channel parameter estimation of the described multichannel baseband signal of described calculating sub module calculating, determine that IRC merges the estimated value of carrier/interface ratio afterwards.
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| CN102065231B (en) * | 2010-11-26 | 2013-04-17 | 深圳中兴力维技术有限公司 | Multipath data fusion device, realization method thereof and multipath audio data processing system |
| CN104025472B (en) * | 2011-10-19 | 2017-09-26 | 爱立信(中国)通信有限公司 | Radio receiver for poliarizing antenna system |
| CN103379078B (en) * | 2012-04-27 | 2016-07-06 | 电信科学技术研究院 | A kind of method and apparatus of frequency domain equalization detection |
| CN103384226B (en) * | 2012-05-02 | 2016-06-08 | 电信科学技术研究院 | The method of a kind of frequency domain equilibrium detection and equipment |
| CN103516412B (en) * | 2012-06-28 | 2017-03-08 | 联芯科技有限公司 | The multiple-input and multiple-output detection method of receiving data and system |
| CN103873129B (en) * | 2012-12-14 | 2017-04-05 | 京信通信系统（中国）有限公司 | adaptive diversity merging method and device |
| CN107306141A (en) * | 2016-04-18 | 2017-10-31 | 深圳市中兴微电子技术有限公司 | AF panel merges and noise balances combination treatment method and device |
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