CN101345567B - Diversity reception method and device based on synchronization sequence - Google Patents
Diversity reception method and device based on synchronization sequence Download PDFInfo
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- CN101345567B CN101345567B CN200810045848A CN200810045848A CN101345567B CN 101345567 B CN101345567 B CN 101345567B CN 200810045848 A CN200810045848 A CN 200810045848A CN 200810045848 A CN200810045848 A CN 200810045848A CN 101345567 B CN101345567 B CN 101345567B
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Abstract
The invention discloses a diversity reception method based synchronous sequence. Radio signal frame has at least two continuous synchronous sequences. For each branch there are sliding related step, delay step, conjugate multiplication step, step of computing diversity detection value and outputting diversity detection signal. Comparing diversity detection signal of each branch, maximum value branch is selected as diversity output branch. The invention overcomes deficiency of existing technology of complex computation, long-time delay for antenna switch, high error rate, provides a simplified diversity reception method for timingly switching diversity antenna, effectively resisting multi-path fading and doppler effect, improving error rate property, which can be widely used in wireless mobile communication field.
Description
Technical field
The present invention relates to a kind of diversity system and method, be specifically related to diversity system and method in receiving station.
Background technology
In mobile communication, often use multi-antenna diversity and receive, it is that many reception antennas are kept certain distance in the space that multi-antenna diversity receives; That every antenna all receives is incoherent each other, multiple signals independently; The energy of these multichannel separation signals is merged to get up by certain rule, make the useful signal energy of reception maximum, thereby improve the power signal-to-noise ratio of receiving terminal; As far as digital signal, make the error rate minimum.Merging mode commonly used has selecting type merging, maximum rate merging, equal gain combining etc.The signal that adopts selecting type to merge promptly to choose the highest or branch road that the error rate is minimum of signal to noise ratio is as the output signal.Existing many antennas selecting type merges implementation method (technology) and may be summarized to be following two kinds:
Be the selection criterion based on received signal level: this is the simplest diversity receiving method; As shown in Figure 1; Each tributary signal sequence carries out inserting modulator or switch logic after the gain controlling through variable gain module; The variable-gain module realizes that the signal to noise ratio (snr) average of each branch road equates, selects the highest branch road output of instantaneous signal-to-noise ratio.But in practical application; Owing to be difficult to measure SNR, thereby in fact use signal level plus noise level (S+N) or noise level (N) as judging parameter, detailed content is seen " wireless communication principles and application "; Theodore S.Rappaport work, the Electronic Industry Press published in 1999.
Selecting type merging based on channel estimating: this is the method for reseptance that generally adopts at present, and is as shown in Figure 2, and each tributary signal sequence S1 is through extraction pilot tone or the training sequence module is calculated again and compare channel parameter estimation value hn (t); The maximum branch road of selective channel parameter value is done the demodulation equilibrium treatment, selects maximum R1 place branch road for dividing collection output branch road.Detailed content is seen " wireless channel during sky ", Gregory .D. moral gold work, and publishing house of Xi'an Communications University published in 2004.
Existing many antennas selecting type merges implementation method (technology), and the shortcoming that they exist is:
Selecting type based on received signal level merges diversity reception, needs instantaneous calculating SNR, and in fact uses (S+N)/N to replace SNR, does not consider channel fading, and the multipath fading and the Doppler frequency shift effect of opposing signal are relatively poor.
Though the selecting type merging diversity receiving technology based on channel estimating utilizes the anti-channel fading of channel estimating, wireless communication signals adopts pilot signal to do channel estimating more at present, causes system-computed complicated, and the antenna handoff delay is bigger, and the error rate is high.
Summary of the invention
The present invention has overcome the deficiency of prior art, and a kind of diversity receiving method that replaces channel estimating with peak value is provided.
For solving above-mentioned technical problem, adopt following technical scheme based on the diversity receiving method of synchronizing sequence:
Based on the diversity receiving method of synchronizing sequence, have two continuous synchronizing sequences in the wireless signal frame at least, carry out according to following steps:
(1), handle to step D according to steps A for each branch road:
A. the correlation step of sliding, the discrete signal X of receiving branch, it is relevant to slide with sequence length k and local synchronizing sequence P, exports correlated results Y;
B. postpone step, the signal Y that steps A is exported delays time, and time-delay length equals the synchronizing signal time span, exports time delayed signal Z then;
C. the conjugate multiplication step is done conjugater transformation to the time delayed signal Z after handling through step B, and the correlated results Y of A step output does the processing of multiplying each other with this moment, and coherent signal S obtains delaying time;
D. calculate to divide the collection detected value, time degree that adds up again of the quadrature signal P after the discrete signal X mould value of the time-delay coherent signal S of step C output and receiving branch square is compared for the signal Q of k does division, output divides and collects detection signal L;
(2) then the branch collection detection signal L of each branch road is compared, select maximum R place branch road for dividing collection output branch road.
Technical scheme further is each branch road while to calculate branch according to steps A to step D to collect detected value.
Technical scheme further is that sequence length k is 2048.
Root technical scheme further is that wireless signal has adopted beacon, and beacon comprises identification signal of transmitter and two identical synchronizing signals.
The present invention can also be made up of with at least one judging module two perhaps above branch road modules based on the diversity receiving device of synchronizing sequence, wherein:
The burst X of branch road module branch road and local synchronizing sequence P input correlation module generate correlated results Y, and correlated results Y input time delay module output time delayed signal Z is again through the coherent signal S that obtains delaying time behind conjugate module and the correlated results Y input multiplier module; The time-delay coherent signal S input module of being divided by, the burst X of branch road gets into a mould value square module and obtains quadrature signal P, input signal P accumulator module obtain cumulative signal Q after also get into the module of being divided by, the module of being divided by output divides collection detection signal L;
The branch collection detection signal L of each branch road module all is input to judging module, and judging module selects the branch road at the value R place of maximum branch road branch collection detection signal L to collect the output branch road for dividing.
Diversity receiving device technical scheme further based on synchronizing sequence is that the sequence length of correlation module and the degree of depth that adds up in the accumulator module all are same value k.
Diversity receiving device technical scheme further based on synchronizing sequence is that sequence length k is 2048.
Based on the diversity receiving device technical scheme further of synchronizing sequence is that the burst X of branch road module branch road has adopted beacon, and beacon comprises identification signal of transmitter and two identical synchronizing signals.
Compared with prior art, the invention has the beneficial effects as follows and simplified diversity reception that help the timely switching of diversity antenna, the influence of effectively resisting multipath fading and Doppler effect improves bit error rate performance.
Description of drawings
Fig. 1 is the sketch map based on the merging of received signal level selecting type of prior art.
Fig. 2 is the sketch map based on the merging of channel estimating selecting type of prior art.
Fig. 3 is the step sketch map of the inventive method.
Fig. 4 is a structure drawing of device of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further elaboration.
As shown in Figure 4, form by first branch road module, second branch road module and a judging module based on the diversity receiving device of synchronizing sequence.Wherein:
The burst X of first branch road module branch road and local synchronizing sequence P input correlation module generate correlated results Y, and correlated results Y input time delay module output time delayed signal Z is again through the coherent signal S that obtains delaying time behind conjugate module and the correlated results Y input multiplier module; The time-delay coherent signal S input module of being divided by, the burst X of branch road gets into a mould value square module and obtains quadrature signal P, input signal P accumulator module obtain cumulative signal Q after also get into the module of being divided by, the module of being divided by output divides collection detection signal L.
Second branch road module branch road and first branch road module are just the same.
The branch collection detection signal L of first branch road module all is input to judging module, and second branch road module branch road divides collection detection signal L all to be input to judging module.
Receive the wireless signal that has adopted beacon at the first branch road, beacon comprises identification signal of transmitter and two identical synchronizing signals, and wireless signal according to shown in Figure 3, is handled according to following steps in first branch road module successively,
E. the correlation step of sliding, the discrete signal X of receiving branch, it is relevant to slide with sequence length 2048 and local synchronizing sequence P, exports correlated results Y;
F. postpone step, the signal Y that steps A is exported delays time, and time-delay length equals the synchronizing signal time span, exports time delayed signal Z then;
G. the conjugate multiplication step is done conjugater transformation to the signal Z after handling through step B, and the correlated results Y of A step output does the processing of multiplying each other with this moment, and coherent signal S obtains delaying time;
H. calculate dividing the collection detected value, is that 2048 signal Q does division and compares with time degree that adds up again of the quadrature signal P after the discrete signal X mould value of the time-delay coherent signal S of step C output and receiving branch square, and output divides collection detection signal LA;
The second branch road receives the wireless signal that has adopted beacon; Beacon comprises identification signal of transmitter and two identical synchronizing signals; Wireless signal is equally handling according to first branch road module by signal treatment step in second branch road module simultaneously, obtains branch collection detection signal LB.
To divide collection detection signal LA and divide collection detection signal LB to compare, if LA LB, then select the first branch road as a minute collection output branch road, otherwise select the second branch road as a minute collection output branch road.
Claims (7)
1. based on the diversity receiving method of synchronizing sequence, have two continuous synchronizing sequences in the wireless signal frame at least, it is characterized in that carrying out according to following steps:
(1), handle to step D according to steps A for each branch road:
A. the correlation step of sliding, the discrete signal of receiving branch (X), it is relevant to slide with sequence length k and local synchronizing sequence P, exports correlated results (Y);
B. postpone step, the signal (Y) of steps A output is delayed time, time-delay length equals the synchronizing signal time span, exports time delayed signal (Z) then;
C. the conjugate multiplication step is done conjugater transformation to the time delayed signal (Z) after handling through step B, and the correlated results (Y) of A step output is done the processing of multiplying each other with this moment, and coherent signal (S) obtains delaying time;
D. calculate and divide the collection detected value; The time-delay coherent signal (S) of step C output is done division with cumulative signal (Q) to be compared; Output divides collection detection signal (L), wherein said cumulative signal (Q) signal that time degree obtains for k in order the quadrature signal (P) after discrete signal (X) the mould value of receiving branch square is added up again;
(2) then the branch collection detection signal (L) of each branch road is compared, select maximum R place branch road for dividing collection output branch road.
2. the diversity receiving method based on synchronizing sequence according to claim 1 is characterized in that described each branch road calculates branch according to steps A to step D simultaneously and collects detected value.
3. the diversity receiving method based on synchronizing sequence according to claim 2 is characterized in that described sequence length k is 2048.
4. the diversity receiving method based on synchronizing sequence according to claim 3 is characterized in that described wireless signal has adopted beacon, and beacon comprises identification signal of transmitter and two identical synchronizing signals.
5. use the device of the diversity receiving method based on synchronizing sequence according to claim 1; It is characterized in that forming with at least one judging module by two branch road modules that perhaps surpass two; Described branch road module comprises correlation module, time delay module, conjugate module, the module of being divided by, mould value square module, accumulator module and multiplier module, wherein:
The burst (X) of branch road module branch road generates correlated results (Y) with local synchronizing sequence P input correlation module; Correlated results (Y) input time delay module output time delayed signal (Z); Do conjugater transformation through conjugate module again, then with the signal after the conjugater transformation and and correlated results (Y) import together and obtain delaying time coherent signal (S) behind the multiplier module; Time-delay coherent signal (S) the input module of being divided by, the burst of branch road (X) gets into a mould value square module and obtains quadrature signal (P), and input signal (P) also gets into the module of being divided by after accumulator module obtains cumulative signal (Q), and the module of being divided by output divides and collects detection signal (L);
The branch collection detection signal (L) of each branch road module all is input to judging module, and judging module selects the branch road at the value R place of maximum branch road branch collection detection signal (L) to collect the output branch road for dividing.
6. the device of the diversity receiving method based on synchronizing sequence according to claim 5 is characterized in that described sequence length k is 2048.
7. the device of the diversity receiving method based on synchronizing sequence according to claim 6 is characterized in that the burst (X) of described branch road module branch road has adopted beacon, beacon to comprise identification signal of transmitter and two identical synchronizing signals.
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| CN109495418B (en) * | 2018-12-27 | 2021-09-14 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | OFDM signal synchronization method, apparatus and computer readable storage medium |
| CN112886985B (en) * | 2021-01-28 | 2023-04-21 | 展讯通信（上海）有限公司 | Bluetooth signal receiving/transmitting method, device, chip and equipment |
| CN113660011B (en) * | 2021-08-17 | 2023-08-22 | 中铁二院工程集团有限责任公司 | Diversity receiving method and system for vacuum pipeline maglev train-ground wireless communication |
| CN113890577B (en) * | 2021-09-28 | 2023-03-14 | 电子科技大学 | Rapid diversity method based on signal similarity |
| CN117097413A (en) * | 2023-08-25 | 2023-11-21 | 北京理工大学 | Multi-sequence merging and balancing single-array element virtual time reversal underwater acoustic communication method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149363A (en) * | 1994-05-31 | 1997-05-07 | 艾利森公司 | Diversity receiver for signals with multipath time dispersion |
| CN1369981A (en) * | 2001-01-31 | 2002-09-18 | 株式会社Ntt都科摩 | Receiving processing method of mobile communicating system and receiving appts. thereof |
| CN1677885A (en) * | 2005-05-26 | 2005-10-05 | 北京航空航天大学 | Diversity receiving method in spread spectrum communication system based on linear frequency regulation series |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149363A (en) * | 1994-05-31 | 1997-05-07 | 艾利森公司 | Diversity receiver for signals with multipath time dispersion |
| CN1369981A (en) * | 2001-01-31 | 2002-09-18 | 株式会社Ntt都科摩 | Receiving processing method of mobile communicating system and receiving appts. thereof |
| CN1677885A (en) * | 2005-05-26 | 2005-10-05 | 北京航空航天大学 | Diversity receiving method in spread spectrum communication system based on linear frequency regulation series |
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