CN110336599A - A kind of multiple signals waveform merging method corrected based on phase error - Google Patents
A kind of multiple signals waveform merging method corrected based on phase error Download PDFInfo
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- CN110336599A CN110336599A CN201910531943.XA CN201910531943A CN110336599A CN 110336599 A CN110336599 A CN 110336599A CN 201910531943 A CN201910531943 A CN 201910531943A CN 110336599 A CN110336599 A CN 110336599A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/0871—Hybrid systems, i.e. switching and combining using different reception schemes, at least one of them being a diversity reception scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/106—M-ary FSK
Abstract
A kind of multiple signals waveform merging method corrected based on phase error of the disclosure of the invention, belongs to the signal diversifying reception technique field in wireless communication.The invention is a kind of waveform merging method.First with the phase difference of the phase difference estimation method estimation two paths of signals based on signal correlation method, waveform merging is carried out to two paths of signals after correcting wherein signal all the way.Emulation shows that the program is that have apparent merging gain suitable for the MFSK modulation system under short wave channel.
Description
Technical field
The invention belongs to the signal diversifying reception technique field in wirelessly communicating, it is low to be related to a kind of computation complexity, is not necessarily to
Prior channel information, the multiple signals waveform merging method without channel estimation.
Background technique
Since there are the characteristics such as multidiameter delay and Doppler frequency shift for short wave channel, it will appear frequency by the data of short wave channel
Rate Selective intensity.It is a kind of method for fighting short wave channel decline that diversity, which merges, common signal merge mode have based on
With the merging measured after filtering, although the effect of such merging mode confrontation synchronous error preferably must be first to multiple signals
Make matched filtering respectively, the expense of one-channel signal processing is larger, is unfavorable for being uniformly processed for signal.In order in receiving end to signal
The uniformity of the work such as demodulation coding must take place at compared with front end when signal is associated with, i.e., based on the merging of waveform.If directly
Merging is weighted to two paths of signals, since there are phase differences for two paths of signals, not estimating that phase directly merges can make to believe after merging
Number decline is more serious, because may be reversed in certain sections of two paths of signals, doing phase correction before waveform merging seems especially
It is important.
Summary of the invention
The present invention is a kind of waveform merging method.The invention firstly uses the phase difference estimation methods based on signal correlation method
Estimate the phase difference of two paths of signals, waveform merging is carried out to two paths of signals after correcting wherein signal all the way.Emulation shows the program
Suitable for the MFSK modulation system under short wave channel, there is apparent merging gain.
Technical scheme is as follows:
Two-way input signal corresponding position is segmented, to avoid phase drift, every of time should not take too long, guarantee
Two paths of signals has approximation to have constant phase difference in the period.Calculate separately two segment signals average energy and two-way it is mutual
Correlation function, and with the phase difference of cross-correlation coefficient and variance evaluation two-way, phase wherein all the way is corrected with the phase difference of estimation
Position, makes two paths of signals phase alignment.Signal after merging two sections of alignment.So the merging to two paths of signals merges paragraph by paragraph,
Because to carry out phase correction paragraph by paragraph.It is following that signal merging process is described using discrete digital signal, but this method is also applied for
Continuous analog signal.The merging process of multiple signals can regard the repetition of several two paths of signals merging process as, so hereafter main
The merging method of two paths of signals is described, the merging of multiple signals can analogize to obtain.
Technical solution of the present invention is a kind of two paths of signals waveform merging method corrected based on phase error, and this method includes
Following steps:
Step 1 is segmented two-way input signal；Respectively to two-way input signal s1(n),s2(n), n=1,2 ... N segmentation,
Assuming that every time is Ts, sampling number is M in every section；Two paths of signals is respectively { s after segmentation1 1(m),s1 2(m),…s1 N/M
(m)},{s2 1(m),s2 2(m),…s2 N/M(m) }, m=1,2 ... M；
Step 2, the signal s for extracting two-way corresponding segment paragraph by paragraph1 i(m),s2 i(m), and the average energy of two paths of signals is calculated separately
Measure S1 i,S2 i；Calculation formula is as follows:
Wherein: ' * ' indicates conjugation
Step 3, the cross-correlation function for calculating two paths of signals paragraph by paragraph, such as i-th section of cross-correlation function are R12 i(0)；
Calculation formula is as follows:
Step 4, the phase difference for seeking two paths of signals paragraph by paragraph
Step 5, with gained adjusting offset wherein signal all the way, signal is after adjustmentMethod of adjustment are as follows:Wherein []HFor Hilbert transform, real { } is to take real part；
Two paths of signals waveform adder is exported y (n) by step 6；
Merge in section:Final output: y (n)=[y1(m),y2(m),...,yi
(m),...yN/M(m)]；Wherein si(m) unadjusted signal all the way in step 5 is indicated.
When merging to multiple signals, two paths of signals has been elected first and has been closed using the method for above-mentioned steps 1 to step 6
And then remaining signal is successively merged with the signal after merging using same procedure.
Beneficial effect of the present invention are as follows: there is significant merging gain than single channel compared with performance using merging method of the invention,
Waveform merges to be completed in the relatively front end of signal processing, is provided great convenience for the diversity reception of digital modulation signals, is kept away
Exempt to carry out reception processing to each road signal respectively, has improved the complexity for reducing signal processing while gain.
Detailed description of the invention
The mentioned method of Fig. 1 present invention and single channel receive the performance comparison of signal.
Specific embodiment
With reference to the accompanying drawings and examples, technical solution of the present invention is described in detail.But it is above-mentioned that this should not be interpreted as to the present invention
The range of main body is only limitted to following embodiment, all to be all belonged to the scope of the present invention based on the technology that the content of present invention is realized.
According to program, the following parameter of Initialize installation:
For the diversity reception of fsk modulated signal, if sample frequency Fs=9600Hz, it is known that sampling number in a symbol
Nsamps=77.Signal to be combined is the short-wave reception signal that two-way has obvious frequency selective fading.
Steps are as follows for waveform merging:
Step 1 receives signal { s to two-wayk(t), k=1,2 } to obtain { s after sample frequency Fs samplingk(n), k=1,2；n
=1,2 ... N }, it is N per data length all the way, data { s is received to two-way respectivelyk, k=1,2 } and segmentation；Specific framing side
Method and parameter setting are as follows: being segmented one by one for one section to signal is received with 77, the segments that the data of N long are total isI.e.
For the symbolic number of transmission.So becoming [r after the segmentation of reception sequence r (n) all the way that length is N1(n),r2(n)...ri
(n),...,rfn(n)], wherein each element indicates one piece of data；
Step 2, the signal s for extracting two-way corresponding segment paragraph by paragraph1 i(m),s2 i(m), and the average energy of two paths of signals is calculated separately
Measure S1 i,S2 i；Calculation formula is as follows:
Note: ' * ' indicates conjugation
Step 3, the cross-correlation function for calculating two paths of signals paragraph by paragraph, such as i-th section of cross-correlation function are R12 i(0)；
Calculation formula is as follows:
Step 4, the phase difference for seeking two paths of signals paragraph by paragraph
Through deriving:Therefore have:
Step 5, with gained adjusting offset wherein signal (assuming that adjustment second road signal) all the way, signal is after adjustment
Method of adjustment are as follows:
Two paths of signals waveform adder is exported y (n) by step 6.
Merge in section:Final output: y (n)=[y1(m),y2(m),...,yi
(m),...yfn(m)]；
Monte Carlo simulation is carried out under short wave channel, simulation parameter is arranged as shown in table 1-1:
Table 1-1 short wave channel waveform merges simulation parameter
It sends signal to encode using (24,12) Golay, carries out 4FSK modulation after coded signal is carried out gray mappings,
Signal passes through two independent short wave channels, the short wave channel selection standard ITU-R shortwave that F.1487 (2000) give after modulation
Channel model ' iturHFMM ', the channel model belong to the mild channel model of middle latitude, can simulate the slightly good reality of electromagnetic environment
Border short wave channel situation.Identical transmission signal by two independent channels, suffered decline be also it is independent, reality can be simulated
Two positions in border receive signal condition.Two paths of signals, which is received, carries out property obtained by demodulation coding using after the merging of mentioned merging method
Energy line is that as a comparison, only wherein directly will carry out performance line obtained by demodulation coding as shown in figure 1 all the way as shown in figure 1 shown in red line
Shown in blue line.
Fig. 1 horizontal axis indicates that the signal-to-noise ratio of average one-channel signal, the longitudinal axis indicate the bit error rate of demodulation coding output.
Emulation shows under the mild short wave channel of middle latitude, estimates paragraph by paragraph in receiving end and corrects the wave of phase error
Shape, which merges, has obvious merging gain compared with single channel reception, as shown in Figure 1.Due to serious frequency selective fading under short wave channel,
The following form of signal waveform is received, two paths of signals different frequency ingredient is respectively by different degrees of fade-out.Waveform merges
It can be obtained under shortwave fading channel and merge gain.Because in order to reach 10 under short wave channel-2Error code, the noise needed compares
Height, the principal element for influencing demodulation effect at this time is signal fadeout, and two paths of signals fading severity is different, makes two by adjusting phase
Signal energy can be improved in road signal in-phase stacking, and then improves output signal-to-noise ratio, obtains and merges gain.
Claims (2)
1. a kind of multiple signals waveform merging method corrected based on phase error, method includes the following steps:
Step 1 is segmented two-way input signal；Respectively to two-way input signal s1(n),s2(n), n=1,2 ... N segmentation, it is assumed that
Every time is Ts, sampling number is M in every section；Two paths of signals is respectively { s after segmentation1 1(m),s1 2(m),…s1 N/M(m)},
{s2 1(m),s2 2(m),…s2 N/M(m) }, m=1,2 ... M；
Step 2, the signal s for extracting two-way corresponding segment paragraph by paragraph1 i(m),s2 i(m), and the average energy of two paths of signals is calculated separately
S1 i,S2 i；Calculation formula is as follows:
Wherein: ' * ' indicates conjugation
Step 3, the cross-correlation function for calculating two paths of signals paragraph by paragraph, such as i-th section of cross-correlation function are R12 i(0)；
Calculation formula is as follows:
Step 4, the phase difference for seeking two paths of signals paragraph by paragraph
Step 5, with gained adjusting offset wherein signal all the way, signal is after adjustmentMethod of adjustment are as follows:Wherein []HFor Hilbert transform, real { } is to take real part；
Two paths of signals waveform adder is exported y (n) by step 6；
Merge in section:Final output: y (n)=[y1(m),y2(m),...,yi(m),...yN/M
(m)]；Wherein si(m) unadjusted signal all the way in step 5 is indicated.
2. a kind of multiple signals merging method using claim 1 the method, it is characterised in that first from multiple signals
It has elected two paths of signals to merge using method of claim 1, then by remaining signal and closed using same procedure
Signal after and is successively merged.
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Citations (3)
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| CN102299750A (en) * | 2010-06-25 | 2011-12-28 | 中兴通讯股份有限公司 | Device and method for MIMO (multiple input multiple output) test |
| CN104981985A (en) * | 2012-11-30 | 2015-10-14 | 科诺索斯公司 | Methods and systems for a distributed radio communications network |
| CN105144598A (en) * | 2012-12-03 | 2015-12-09 | 数字无线功率有限公司 | Systems and methods for advanced iterative decoding and channel estimation of concatenated coding systems |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299750A (en) * | 2010-06-25 | 2011-12-28 | 中兴通讯股份有限公司 | Device and method for MIMO (multiple input multiple output) test |
| CN104981985A (en) * | 2012-11-30 | 2015-10-14 | 科诺索斯公司 | Methods and systems for a distributed radio communications network |
| CN105144598A (en) * | 2012-12-03 | 2015-12-09 | 数字无线功率有限公司 | Systems and methods for advanced iterative decoding and channel estimation of concatenated coding systems |
Non-Patent Citations (2)
| Title |
|---|
| BINHONG DONG等: ""A Subset-Based Coherent FFH System"", 《IEEE COMMUNICATIONS LETTERS》 * |
| 董彬虹等: ""一种M-FSK信号的能量度量Viterbi软译码算法性能分析"", 《电子与信息学报》 * |
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