CN104883229B - A kind of code division multibeam signals separation method based on FDMA system - Google Patents
A kind of code division multibeam signals separation method based on FDMA system Download PDFInfo
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- CN104883229B CN104883229B CN201510142427.XA CN201510142427A CN104883229B CN 104883229 B CN104883229 B CN 104883229B CN 201510142427 A CN201510142427 A CN 201510142427A CN 104883229 B CN104883229 B CN 104883229B
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Abstract
The present invention relates to a kind of code division multibeam signals separation method based on FDMA system, belong to microwave signal measurement field.The inventive method utilizes prior information, the Signal averaging after multidiameter delay is mixed, and is then passed through low pass filter and the matched filter of common branch, the multiplexed signals of frequency division is all moved base band；Again because the corresponding beam signal of each frequency has each different coded sequences, its respective auto-correlation function can be used to distinguish each beam signal, therefore carry out obtaining relevant peaks after related operation and the detection of relevant peaks using matched multidiameter delay Code acquisition module, relevant peaks are carried out decorrelation computing and is finally recovered out signal.Contrast the separation method of traditional code division multibeam signals based on FDMA system, the inventive method is passed through to introduce decorrelation computing, the down conversion module of complicated multidiameter delay and matched filter module are simplified, significantly save hardware resource, improve operation efficiency, save resource consumption.
Description
Technical field
The present invention relates to a kind of signal separating method, divided based on the code division multibeam signals of FDMA system particularly to a kind of
From method, belong to microwave signal measurement field.
Background technology
In multiple beam forming network real system, in multiple beam forming network, the factor such as sensor gain and phase uncertainties of analog device can lead to
Between array channel, the amplitude of each beamformer output and phase relation deviate preset value.Therefore it is precisely separating out the FDMA of antenna system
(frequency division multiple access) multibeam signals, and calculate the Amplitude-phase relation between each multibeam signals according to the multibeam signals isolated
There is important practical significance, only accurately estimate the passage sensor gain and phase uncertainties of antenna system and compensate, Cai Nengbao
The quality of card beam shaping, makes multiple beam forming network accurately and effectively work.The method that tradition separates FDMA multibeam signals only needs
By the matched filter module by parallel multichannel down conversion module and multidiameter delay for the multibeam signals, down conversion module bag
Include mixing, two parts of low pass filter, in this way can be by separation complete for FDMA multibeam signals.
In actual applications, the matched filter module of multidiameter delay down coversion and multidiameter delay need to consume substantial amounts of
High-speed gear DSP48, logical resource Slice etc. in FPGA resource, such as piece.Therefore, dividing of FDMA multibeam signals will be realized
From with the increase of parallel FDMA multibeam signals frequency points, using the consumption of traditional wave beam signal separating method resource
Amount can not be estimated.
Content of the invention
The purpose of the present invention is that traditional FDMA multibeam signals separation method hardware resource consumption is big, arithmetic speed in order to solve
Slow problem, it is proposed that a kind of code division multibeam signals separation method based on FDMA system, this process simplify system structure,
Reduce resource consumption, decrease the Signal separator time.
Idea of the invention is that utilizing prior information, that is, the multibeam signals of FDMA also meet the condition of code division simultaneously, will
Signal averaging after multidiameter delay mixing, is then passed through low pass filter and the matched filter of common branch, answering frequency division
All move base band with signal；Again because the corresponding beam signal of each frequency has each different coded sequences, it is each
Auto-correlation function can be used to distinguish each beam signal, therefore carry out phase using matched multidiameter delay Code acquisition module
It is finally recovered out signal after closing computing and related blob detection.
The present invention is achieved by the following technical solutions.
A kind of code division multibeam signals separation method based on FDMA system, its key step is as follows：
Step one, information source produce FDMA signal, each frequency corresponding wave beam not only frequency division, also code division simultaneously；
Step 2, receiving terminal receive FDMA multibeam signals, carry out the mixing operation of multidiameter delay, and FDMA multi-beam is believed
Number move base band from respective frequency respectively；
Result after step 3, the multidiameter delay mixing obtaining step 2 is overlapped, jointly through low pass after superposition
Wave filter filters high fdrequency components；
Step 4, the signal obtaining step 3 carry out matched filtering through matched filter, reduce intersymbol interference, improve
The bit error rate；
Step 5, the signal obtaining step 4, through the Code acquisition module of multidiameter delay, carry out correlation to input signal
Computing and related blob detection, obtain the correlation peak signal of each road Code acquisition module output, and the correlation peak signal obtaining is and separates
The beam signal opened；
Step 6, each road relevant peaks that step 5 is obtained carry out decorrelation computing, and the signal calculating is after separating
The signal of no multi-access inference.
The wave beam completing the code division multibeam signals based on FDMA system through above-mentioned seven steps separates.
Beneficial effect
The present invention is a kind of wave beam separation method of the code division multibeam signals based on FDMA system.The many ripples of traditional FDMA
Bundle signal separating method needs frequency mixing module, the low pass filter blocks of multidiameter delay and the coupling of multidiameter delay of multidiameter delay
Filtration module, the operation of multidiameter delay can consume substantial amounts of FPGA resource, requires relatively for common fpga chip resource capacity
High.And adopt the inventive method, by after the Signal averaging after mixing common through low pass filter and matched filter, by low pass
Filtering and matched filter can reduce n-1 (n is the frequency points of frequency division signal) individual low-pass filtering after transferring to common branch
Device and the composite module of matched filter, significantly decrease resource consumption, improve operation efficiency, reduce operation time.
Simultaneously as FDMA multibeam signals each coded sequence is different, so the multi-access inference causing after Signal averaging also can
Enough pass through the little decorrelation computing of consumed resource to remove, thus all wave beams are separated.
In sum, present invention utilizes the condition that the multibeam signals of FDMA meet code division understands although introducing simultaneously
Related operation consumes a small amount of resource, but the down conversion module of complicated multidiameter delay and matched filter module have been carried out letter
Change, substantial amounts of save hardware resource, improve arithmetic speed.
Brief description
Fig. 1 is the separation method schematic flow sheet of traditional code division multibeam signals based on FDMA system；
Fig. 2 is the separation method schematic flow sheet of the code division multibeam signals based on FDMA system of the embodiment of the present invention；
Fig. 3 is the separation method of code division multibeam signals based on FDMA system for the tradition and the present invention based on FDMA system
The separation method of code division multibeam signals bit error rate comparison schematic diagram；
Fig. 4 is that the code division multibeam signals separation method based on FDMA system of the embodiment of the present invention is based on FDMA with tradition
The time-consuming comparison diagram of the separation method of code division multibeam signals of system.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, also described technical solution of the present invention simultaneously
Solve technical problem and beneficial effect it should be pointed out that described embodiment is intended merely to facilitate the understanding of the present invention,
And any restriction effect is not risen to it.
It is the separation method schematic flow sheet of the code division multibeam signals based on FDMA system for the tradition as shown in Figure 1, mainly
Method is the frequency division multibeam signals that the send information source matched filter in parallel through multichannel down conversion module and multidiameter delay
Module, wherein down conversion module include mixing, two parts of low pass filter.Taking a road down conversion module as a example, frequency mixing module
Main Function be that the multibeam signals of FDMA are moved base band, high-frequency signal can be produced simultaneously；The effect of low pass filter
Exactly retain baseband signal, filter high-frequency signal；Baseband signal is mated by the matched filter module of multidiameter delay
Filtering, reduces intersymbol interference, improves the bit error rate；Then utilize the good autocorrelation of coded sequence in code division signal, through excessive
The detection that the parallel Code acquisition module in road carries out related operation and relevant peaks obtains the relevant peaks on each road, you can obtains wave beam and separates
Result afterwards.
It is that the separation method flow process of the code division multibeam signals based on FDMA system of the embodiment of the present invention is shown as shown in Figure 2
Be intended to, main method be the code division multibeam signals based on FDMA system that information source is sent in parallel through multichannel frequency mixing module,
FDMA signal is moved base band, the aliasing of signal spectrum can be produced simultaneously, but can ensure that each wave beam is shifted to
Base band.Multiple signals after mixing are added, now Signal averaging, spectral aliasing, but still be can guarantee that each ripple
It is constant that bundle retains primary signal in baseband portion.Signal after superposition is filtered the high frequency of signal after aliasing through low pass filter
Component, signal now only remains base band component and partially due to the low frequency component of mixing generation, passes through signal further
Matched filter carries out matched filtering.Then again signal be can get the correlation on each road through the Code acquisition module of multidiameter delay
Peak-to-peak signal, the multibeam signals of code division are due to introducing multi-access inference in the overlap-add operation in down conversion module, so needing
Carry out decorrelation computing and eliminate multi-access inference after Code acquisition module, the multiple signals after decorrelation computing are final wave beam
Separating resulting.
Embodiment
To test user for 8 (i.e. 8 frequencies), select and there is the multi-beam width phase as spreading code for the nonopiate codeword sequence
As a example test system, the specific implementation process of the present invention is illustrated.
Step one, make multi-beam width phase test system test user be 8 (i.e. 8 groups of spreading codes), information source sends 8 frequency divisions
Multi-address signal, the corresponding beam signal of each frequency also correspond to one of 8 groups of spreading codes simultaneously.Spreading code can select Gold
Code, m-sequence, ZCZ sequence etc., the spread spectrum code character selecting in this example is m-sequence.Frequency arbitrarily can set, in this example, if
Frequency is 100MHz, 110MHz, 120MHz, 130MHz, 140MHz, 150MHz, 160MHz, 170MHz.
The multibeam signals receiving are carried out 8 parallel tunnel mixing behaviour according to known 8 frequencies by step 2, receiving terminal
Make, the frequency division signal of 8 frequencies is moved base band respectively.Only corresponding frequency in the optical mixing process on each road, that is, in this example,
Frequency is 100MHz, and the signal of 110MHz, 120MHz, 130MHz, 140MHz, 150MHz, 160MHz, 170MHz could be moved
To base band (0MHz), such as in first via mixing operation, the only signal for 100MHz for the frequency has been shifted to base band, remaining 7
The signal of frequency is distributed near baseband.This step can produce the parallel signal in 8 tunnels, and each road signal all comprises this road and corresponds to
The baseband signal of frequency, the high-frequency signal of corresponding frequency, and result after the corresponding mixing of remaining frequency；
Step 3, the multi-path parallel signal obtaining step 2 are superimposed, and comprise the base of 8 wave beams in the data now obtaining
Band signal, also has the aliasing signal of the near baseband after mixing simultaneously.Signal after addition filters high frequency through low pass filter
Component, complete remains baseband signal, and in this example, low pass filter design is Keyser window function, and filter bandwidht is set to
500KHz, Sidelobe Suppression is 40dBc, and the tap coefficient of wave filter is 144；
Step 4, the signal obtaining step 3 are through matched filter module.Wherein matched filter can adopt root
Raised cosine filter, Square-Wave Filter etc., select root raised cosine filter, the design of root raised cosine filter in the present embodiment
For over-sampling rate 16, rolloff-factor is 1, and filter tap coefficients are 482；
Step 5, the signal exporting matched filter carry out the Code acquisition module of the parallel PN code in 8 tunnels, Code acquisition module
Slippage correlation acquisition method, digital matched filter (DMF) and the fast Acquisition method based on FFT can be adopted.In the present embodiment
Code acquisition module selects digital matched filter (DMF), and the parallel digital matched filter in each road is respectively from the code of 8 groups of superpositions
The signal using arbitrary group of predetermined pattern in 8 groups of spreading codes known in step one is selected, other are using different in sub-signal
The signal of pattern can not be despread because of different from the local pattern that receiver produces, using the good autocorrelation of m-sequence
The code division multibeam signals of 8 tunnel superpositions can be separated.If making the signal that r is that receiving terminal receives,Solve for expectation
Primary signal, A is PN code character, AHFor the transposition of PN code character, the operational formula of digital matched filter isSignal warp
The relevant peaks of each road output signal are obtained after crossing digital matched filter.Do because the overlap-add operation after mixing introduces multiple access
Disturb, the parallel correlation peak signal in 8 tunnels now obtaining still does not have complete separating；
Step 6, using decorrelation matrix operational formula：H=(AHA)-1, wherein A is PN code character, AHRepresent PN code character
Transposition, the upper right corner " -1 " representing matrix inverts.Corresponding 8 groups of spread spectrum code sequence computings are obtained corresponding decorrelation matrix.
The relevant peaks of obtain in step 58 road Code acquisition module outputs are conciliate correlation matrix Combined Calculation, solution formula is：Can get the signal after the no separation of multi-access inference.
Experimental result
For above-described embodiment, following table is the code division multibeam signals separation method based on FDMA system for the use tradition and basis
The FPGA resource consumption contrast of the code division multibeam signals separation method based on FDMA system of embodiment, used in this example
FPGA model xc6vlx240t.
Can be obtained by upper table, substantial amounts of DSP48E1s and Slice resource can be consumed using traditional multi-beam separation method, and
The consumption that greatly reducing both resources based on the code division multibeam signals separation method of FDMA system of the present invention.
Be as shown in Figure 3 the separation method of code division multibeam signals based on FDMA system for the tradition and the present invention based on
The bit error rate of the separation method of code division multibeam signals of FDMA system compares.From figure 3, it can be seen that working as signal to noise ratio Eb/No
When 1 to 11 change, the bit error rate of two kinds of systems all reduces, the variation tendency that the bit error rate of two methods changes with signal to noise ratio
Unanimously it was demonstrated that the present invention does not cause the raising of the bit error rate to the change of traditional wave beam separation method structure.
Be as shown in Figure 4 the present invention the code division multibeam signals separation method based on FDMA system and tradition be based on FDMA
The time-consuming comparison diagram of the separation method of code division multibeam signals of system.Figure 4, it is seen that the wave beam when multibeam signals
When number is few, separated than the multi-beam proposing in the present invention using the time needed for traditional multibeam signals separation method
Method is more or less the same, but is as the increase of the wave beam number of multibeam signals, and frequency number also accordingly increases, both time-consuming differences
Value becomes big, and when wave beam number increases to 10, application the inventive method carries out multibeam signals separation and can improve efficiency
More than 10.
In sum, application the inventive method carries out Signal separator, can save big in the case of not changing the bit error rate
Amount hardware resource, reduces resource consumption, improves operation efficiency.
Above-described specific descriptions, have been carried out further specifically to the purpose of invention, technical scheme and beneficial effect
Bright, be should be understood that the specific embodiment that the foregoing is only the present invention, the protection model being not intended to limit the present invention
Enclose, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., should be included in the present invention
Protection domain within.
Claims (1)
1. a kind of code division multibeam signals separation method based on FDMA system is it is characterised in that comprise the steps：
Step one, information source produce FDMA signal, each frequency corresponding wave beam not only frequency division, also code division simultaneously；
Step 2, receiving terminal receive FDMA multibeam signals, carry out the mixing operation of multidiameter delay, FDMA multibeam signals are divided
Do not move base band from respective frequency；
Result after step 3, the multidiameter delay mixing obtaining step 2 is overlapped, jointly through low-pass filtering after superposition
Device filters high fdrequency components；
Step 4, the signal obtaining step 3 carry out matched filtering through matched filter, reduce intersymbol interference, reduce error code
Rate；
Step 5, the signal obtaining step 4 carry out the inspection of related operation and relevant peaks through the Code acquisition module of multidiameter delay
Survey, obtain the correlation peak signal of each road Code acquisition module output, separated with realizing wave beam；The operational formula of described Code acquisition module
ForWherein,Represent the primary signal that expectation solves out, r represents the signal that receiving terminal receives, and A represents PN code character,
AHRepresent the transposition of PN code character；
Step 6, each road relevant peaks that step 5 is obtained carry out decorrelation computing, and the signal calculating is no many after separating
The signal of location interference；Described decorrelation computing is by relevant peaks and decorrelation matrix multiple, and operational formula is as follows：
Wherein,Represent the primary signal that expectation solves out, r represents the signal that receiving terminal receives, and A represents PN code character, AHTable
Show the transposition of PN code character, the upper right corner " -1 " representing matrix is inverted.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7444128B1 (en) * | 2006-01-19 | 2008-10-28 | The United States Of America As Represented By The Secretary Of The National Security Agency | Method of estimating a high frequency carrier signal |
| CN101502007A (en) * | 2006-08-08 | 2009-08-05 | 高通股份有限公司 | Intermodulation distortion detection and mitigation |
| CN104365041A (en) * | 2012-06-19 | 2015-02-18 | 高通股份有限公司 | Block sharing using three-way transformers in wireless circuits |
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| ZA965340B (en) * | 1995-06-30 | 1997-01-27 | Interdigital Tech Corp | Code division multiple access (cdma) communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7444128B1 (en) * | 2006-01-19 | 2008-10-28 | The United States Of America As Represented By The Secretary Of The National Security Agency | Method of estimating a high frequency carrier signal |
| CN101502007A (en) * | 2006-08-08 | 2009-08-05 | 高通股份有限公司 | Intermodulation distortion detection and mitigation |
| CN104365041A (en) * | 2012-06-19 | 2015-02-18 | 高通股份有限公司 | Block sharing using three-way transformers in wireless circuits |
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