CN106101037A - The method that cross polarization interference offsets - Google Patents
The method that cross polarization interference offsets Download PDFInfo
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- CN106101037A CN106101037A CN201610436336.1A CN201610436336A CN106101037A CN 106101037 A CN106101037 A CN 106101037A CN 201610436336 A CN201610436336 A CN 201610436336A CN 106101037 A CN106101037 A CN 106101037A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03305—Joint sequence estimation and interference removal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03312—Arrangements specific to the provision of output signals
Abstract
The invention provides a kind of method that cross polarization interference offsets, utilize the present invention can significantly solve to disturb signal to cause main signal signal to noise ratio to reduce, the problem of penalty.The technical scheme is that: main signal and reference signal are converted to digital signal by respective ADC by digital demodulation receiver respectively, main digital signal, after carrier wave demodulation loop carries out carrier wave demodulation process, obtains the base band component of main signal by clock recovery loop clock recovery；Reference digital signal carries out down coversion by the carrier wave demodulation loop information of main signal, then carries out resampling by the clock recovery loop information of main signal, it is thus achieved that the base band component of reference signal；The base band component of main signal and the base band component of reference signal jointly enter cross polarization interference and offset module, by sef-adapting filter output interference signal baseband component, the base band component of main signal deducts the interference signal baseband component of sef-adapting filter output, exports the signal after offseting.
Description
Technical field
The present invention relates in wireless communication field, the receiving device for polarization multiplexing system provides a kind of simple possible
Cross polarization interference offsets method.More specifically, the present invention passes through the demodulation loop information of main signal to interference reference signal
Carry out down coversion and resampling, extract interference base band component.And realize what cross polarization interference offseted by sef-adapting filter
Method.
Technical background
Radio-frequency spectrum is the natural resources of a kind of preciousness.Along with the gradually ripe of wireless communication technology and Communications Market
Expand rapidly.Existing frequency spectrum resource is just tending to exhausted.Polarization multiplexing technology utilizes polarization of electromagnetic wave characteristic, uses vertical polarization
Transmit signal with horizontal polarization respectively, thus the utilization rate of frequency spectrum can be made to double, be a kind of weight improving the availability of frequency spectrum
Want means.Ideally. the perpendicular polarisation components of electromagnetic wave and horizontal polarized components are mutually isolated, and do not have therebetween
Interference.But in a practical situation, polarization of electromagnetic wave direction can deflect, thus cause polarization interference.Polarization rotation
Reason includes: transmitter, receiver feed system in polarization separation device and transmitting, reception antenna itself non-ideal
Property, scattering that the multipath effect in electromagnetic wave propagation path and rain, snow, dust cause etc..Polarization rotation causes horizontal polarization
And interfere between vertical polarization, so that signal to noise ratio declines, the bit error rate rises, under serious conditions, will result in communication disruption.
Due to the impact of cross polarization interference, can be mixed into horizontal polarization signals in vertical polarization receiver, vice versa.This interference
The bit error rate can be caused to rise, even result in communication disruption.Future communications satellite will progressively develop into the comprehensive large satellite of performance,
Data acquisition, navigate, the aspect such as communication realizes high-performance, high efficiency, the requirement to the rate of information throughput reaches G magnitude.It is full
Foot high speed data transfer demand, conventional technological means includes selecting high order modulation system, selecting higher frequency section to carry out data biography
Defeated, use channeling technology.Polarization multiplexing is favorably improved the utilization ratio of radio-frequency spectrum, but necessary in it uses
Coordinate and use polarization interference cancellation (XPIC) measure.
Cross polarization interference is a kind of interference that channeling brings.Due to channel non-ideal characteristic, isolation between antennas etc.
Factor, the mutual aliasing of two-channel independent of channeling, cross interference.The existence of interference signal causes main signal signal to noise ratio to drop
Low, penalty.In the wireless system for transmitting data shown in Fig. 3, transmitting terminal uses cross-polarized channeling technology, sends out
Penetrate antenna and reception antenna utilizes the electromagnetic wave level when spatial transmission to transmit two be polarized in identical frequency band with vertical two in
Individual independent signal and s2(t).Due to impacts such as the polarization isolation of antenna, the multipath fading of communication space, scattering, misty rains, lead
The mutual aliasing of the number of writing, i.e. polarize cross interference.Receive aliasing signal and x2(t).The existence of interference signal causes main signal
Signal to noise ratio reduces, penalty.
The current visible cross polarization interference of document offsets method and mainly divides main two classes: radio frequency or intermediate frequency carry out cross polarization
Interference cancellation, and base band carries out cross polarization interference and offsets.Radio frequency or intermediate frequency scheme advantage are without carrier synchronization and code element
Synchronizing, shortcoming is that operand is relatively big, especially for high speed signal, owing to the rate of information throughput is high, systematic sampling rate
Reach G magnitude.Carrying out related operation, search arithmetic under G magnitude speed, resource consumption is very big, is therefore more likely in high-speed digital transmission
Base band scheme.
Existing base band carries out cross polarization interference method, is first demodulated two paths of signals respectively, then will demodulation
After the mutual computing of baseband signal, deduction interference signal.Carry out carrier synchronization due to two paths of signals respectively and clock synchronizes, main letter
Interference components down converted frequencies in number is main signal carrier frequency, and the interference components down converted frequencies in reference signal is ginseng
Examine signal frequency.Therefore, when two paths of signals has carrier beat, conversion frequencies is different, causes two interference components after down coversion
The most consistent.Therefore the situation of two signal carrier frequency differences cannot be adapted to.Meanwhile, the interference components resampling rate in main signal is
Main signal chip rate, and the interference components resampling rate in reference signal is reference signal chip rate.Therefore believe when two-way
During number chip rate difference, sampling rate is different, causes two interference components after resampling the most consistent.Therefore cannot adapt to
The situation that two signal element speed is different.
Summary of the invention
In place of it is an object of the invention to for above-mentioned the deficiencies in the prior art, proposing a kind of resource consumption little, stability is high,
Interference components in main signal is Tong Bu with the interference components in reference signal, it is possible to adapt to two signal(-) carrier frequency differences, two
The method that the cross polarization interference of individual signal element speed different situations offsets.To solve to disturb signal to cause main signal signal to noise ratio
Reduce, the problem of penalty.
In order to achieve the above object, the method that a kind of cross polarization interference that the present invention proposes offsets, there is following technology
Feature: in digital demodulation receiver, the down coversion of reference signal uses main signal coherent carrier, reference signal after down coversion
Resampling clock uses main signal chip clock, makes the interference components in main signal keep same with the interference components in reference signal
Step；Digital demodulation receiver is by the main signal of two-way polarization multiplexing received and reference signal, respectively by respective modulus
Main signal and reference signal are converted to digital signal by transducer ADC, and main digital signal carries out carrier wave solution through carrier wave demodulation loop
After mediating reason, obtained the base band component of main signal by clock recovery loop clock recovery；Reference digital signal passes through main signal
Carrier wave demodulation loop information carry out down coversion, then carry out resampling by the clock recovery loop information of main signal, it is thus achieved that
The base band component of reference signal；The last base band component of main signal and the base band component of reference signal jointly enter cross polarization and do
Disturb and offset module, carry out cross polarization and offset；The base band component of reference signal is in cross polarization interference offsets module, by certainly
Adaptive filter output interference signal baseband component, the base band component of main signal deducts the interference signal of sef-adapting filter output
Base band component, exports the signal after offseting.
In digital demodulation receiver, the down coversion of reference signal uses main signal coherent carrier, with reference to letter after down coversion
Number resampling clock use main signal chip clock, make interference components in main signal protect with the interference components in reference signal
Hold synchronization；Main signal and the reference signal of the two-way polarization multiplexing received are passed through analog digital conversion by digital demodulation receiver respectively
Device ADC, is converted into digital signal by analogue signal, and main signal carrier wave demodulation loop carries out carrier wave demodulation or lower change to digital signal
Frequently, being converted to zero intermediate frequency signals, clock recovery loop obtains baseband signal to zero intermediate frequency signals resampling.Then by two-way base band
Signal is input to cross polarization and offsets module, carries out cross polarization and offsets.First main signal circuit and reference signal circuit are distinguished
By respective ADC, main signal and reference signal being converted to digital signal, the ADC of two circuit shares same reference clock；So
Rear main digital signal, after carrier wave demodulation loop is demodulated processing, obtains main signal by clock recovery loop clock recovery
Base band component；Reference digital signal carries out down coversion by the carrier wave demodulation loop information of main signal, then by main signal
Clock recovery loop information carries out resampling, it is thus achieved that the base band component of reference signal；The base band component of last main signal and reference
The base band component of signal jointly enters cross polarization interference and offsets module, carries out cross polarization and offsets.Cross polarization interference offsets
In module, the base band component of reference signal is by adaptive-filtering output interference signal baseband component；Then the base band of main signal
Component deducts the interference signal baseband component of sef-adapting filter output, exports the signal after offseting.Subtracted signal conduct simultaneously
The input signal of decision device in sef-adapting filter, the signal after simultaneously subtracted signal being offseted as cross polarization interference, real
Existing cross polarization interference offsets.
The present invention has the advantages that compared to prior art
The present invention can adapt to two signal(-) carrier frequency different situations.In interference components in main signal and reference signal
In interference components synchronization process, the frequency needed for reference signal down coversion and phase information, use both from synchronization master
The carrier wave demodulation loop of signal, reference signal carries out down coversion by external number controlled oscillator, replaces carrier wave demodulation loop, conversion
For zero intermediate frequency signals, the interference components that the interference components comprising main signal and reference signal comprise carries out identical frequency conversion
Processing, no matter main signal is the most identical with reference signal carrier frequency, and after two interference components are downconverted, carrier frequency is still
Keep consistent.Therefore, the present invention adapts to two different situations of signal(-) carrier frequency.
The present invention can adapt to two signal element speed different situations.Needed for the present invention uses reference signal resampling
Clock and phase information, both from the clock recovery loop of synchronization main signal, reference signal is carried out by external clock
Resampling, replaces clock recovery loop to obtain baseband signal, the interference that the interference components that main signal comprises and reference signal comprise
Component carries out identical resampling process.
Stability is high.The interference components that the interference components that main signal of the present invention comprises and reference signal comprise carries out complete phase
Same ADC, down coversion and resampling process, and interference components keeps consistent in two kinds of signals.Therefore at cross polarization interference pair
Disappearing in module, reference signal base band component extracts interference components, the interference components of this extraction and main letter by sef-adapting filter
Number interference components comprised can be by subtracting each other counteracting.Thus solve interference signal and cause main signal signal to noise ratio to reduce, performance is disliked
The problem changed.
The present invention is applicable to various needs and carries out the digital demodulation receiver that cross polarization offsets, and is applicable to the two poles of the earth
Change signal(-) carrier frequency different, or the situation that chip rate is different.
Accompanying drawing explanation
In order to be more clearly understood that the present invention, now referring concurrently to accompanying drawing, this will be described by the embodiment of the present invention
Bright, wherein:
Fig. 1 is the theory diagram that the cross polarization interference of the present invention offsets.
Fig. 2 is the operation principle schematic diagram that Fig. 1 cross polarization interference offsets module.
Fig. 3 is that in prior art, cross polarization interference produces schematic diagram.
Detailed description of the invention
Refering to Fig. 1.According to the present invention, in digital demodulation receiver, the down coversion of reference signal uses main signal to be concerned with
Carrier wave, after down coversion, the resampling clock of reference signal uses main signal chip clock, makes the interference components in main signal and ginseng
Examine the interference components in signal to keep synchronizing；Digital demodulation receiver is by the main signal of two-way polarization multiplexing received and reference
Signal respectively by analog-digital converter ADC, analogue signal is converted into digital signal, main signal carrier wave demodulation loop to numeral believe
Number carrying out carrier wave demodulation or down coversion, be converted to zero intermediate frequency signals, clock recovery loop obtains base to zero intermediate frequency signals resampling
Band signal.Then two-way baseband signal is input to cross polarization and offsets module, carry out cross polarization and offset.Main signal circuit and
Main signal and reference signal are converted to digital signal by respective ADC by reference signal circuit the most respectively, the ADC of two circuit
Share same reference clock；Then main digital signal is after carrier wave demodulation loop is demodulated processing, and passes through clock recovery loop
Clock recovery obtains the base band component of main signal；Reference digital signal carries out lower change by the carrier wave demodulation loop information of main signal
Frequently, then resampling is carried out by the clock recovery loop information of main signal, it is thus achieved that the base band component of reference signal；The most main letter
Number base band component and the base band component of reference signal jointly enter cross polarization interference and offset module, carry out cross polarization pair
Disappear.Cross polarization interference offsets in module, and the base band component of reference signal is divided by adaptive-filtering output interference signal baseband
Amount；Then the base band component of main signal deducts the interference signal baseband component of sef-adapting filter output, exports the letter after offseting
Number.Subtracted signal is as the input signal of decision device in sef-adapting filter simultaneously, simultaneously using subtracted signal as cross polarization
Signal after interference cancellation, it is achieved cross polarization interference offsets.
In above-mentioned digital demodulation receiver, reference signal carries out down coversion by external number controlled oscillator, replaces carrier wave
Demodulation loop, is converted to zero intermediate frequency signals, and the interference components that the interference components comprising main signal and reference signal comprise is carried out
Identical frequency-conversion processing.Reference signal carries out resampling by external clock, replaces clock recovery loop, it is thus achieved that base band is believed
Number.The down coversion of reference signal uses main signal coherent carrier, and after down coversion, the resampling clock of reference signal uses main signal
Chip clock so that the interference components in main signal keeps Tong Bu with the interference components in reference signal.Assume first that digital solution
Adjust receiver with the two-way polarization multiplexing signal that receives as main signal, for reference signal, by two-way polarization multiplexing signal and point
Analog-digital converter ADC, carrier wave demodulation or down coversion, resampling Tong Guo not obtain baseband signal；Then two-way baseband signal is carried out
Cross polarization offsets.Main signal is converted to digital signal by ADC, after carrier wave demodulation loop is demodulated processing, when passing through
Clock recovers loop clock and recovers to obtain main signal base band component；Reference signal is converted to digital signal by ADC, this reference signal
The ADC of circuit and the ADC of main signal circuit shares same reference clock, then by the carrier wave demodulation loop on main signal circuit
Information carries out down coversion, carries out resampling finally by the clock recovery loop clock on main signal circuit, it is thus achieved that reference signal
Base band component；Main signal base band component and reference signal base band component jointly enter cross polarization interference and offset module.Intersecting
In polarization interference cancellation module, reference signal base band component disturbs signal baseband component by sef-adapting filter output, and will
Main signal base band component deducts the interference signal baseband component of sef-adapting filter output, it is achieved offset.
With x1T () is main signal, x2T () is reference signal as a example by, main signal passes through carrier wave demodulation loop and clock recovery ring
Road is to main signal x1T () is normally carried out demodulation, complete carrier wave demodulation and clock recovery；Reference signal x2(t) and main signal x1(t)
Share same sample reference clock fs；By main signal x1T the carrier wave demodulation loop of () provides the sinusoidal component of down coversion to divide with cosine
Amount sin/cos, by low-converter to x2T () carries out down coversion；After down coversion completes, by main signal x1The symbol synchronization of (t)
Clock fcTo reference signal x2T () carries out resampling；Finally, main signal x1Main signal base band component I of (t)x1(n)/Qx1(n) with
x2Reference signal base band component I of (t)x2(n)/Qx2N () jointly enters cross polarization interference and offsets module.
Refering to Fig. 2.Cross polarization interference offsets module and includes: delayer and by transversal filter and decision device form from
Adaptive filter, wherein, delayer series connection sef-adapting filter.In cross polarization interference offsets module, reference signal x2(t)
Two base band component Ix2(n)/Qx2N sef-adapting filter output interference that () forms via transversal filter and decision device etc.
Signal baseband componentMain signal x1Two base band component I of (t)x1(n)/Qx1N () postpones defeated by delayer
Go out and interference signal baseband componentThe I of alignment on timex1(n+N)/Qx1(n+N).Delayer output Ix1(n+
N)/Qx1(n+N) with sef-adapting filter output interference signal baseband componentSubtract each other, it is thus achieved that after eliminating interference
SignalRealize cross polarization and offset function.Eliminate the signal after interferenceBy decision device, obtain
Output demodulated signal I must be adjudicatedd1(n)/Qd1(n)；Then judgement is exported demodulated signal Id1(n)/Qd1N () disturbs with elimination after
SignalSubtract each other acquisition error signal Ie(n)/Qe(n)；And by this error signal Ie(n)/QeN () is multiplied by step-length
Factor mu feeds back to transversal filter, regulates filter coefficient.
Sef-adapting filter includes transversal filter, decision device.Wherein: fsFor ADC reference clock；Sin/cos is main letter
The sinusoidal component of number carrier wave demodulation loop and cosine component；Ix1(n)/Qx1N () is main signal base band component；Ix2(n)/Qx2(n) be
Reference signal base band component；For sef-adapting filter output interference signal baseband component；Ix1(n+N)/Qx1(n+
N) it is Ix1(n)/Qx1N () delayer exports；For Ix1(n+N)/Qx1(n+N) withThe knot subtracted each other
Really；Id1(n)/Qd1N () is that decision device exports demodulated signal；Ie(n)/QeN () is Id1(n)/Qd1(n) withSubtract each other
Error signal；μ is step factor.
Claims (10)
1. the method that cross polarization interference offsets, has following technical characteristic: in digital demodulation receiver, reference signal
Down coversion use main signal coherent carrier, after down coversion reference signal resampling clock use main signal chip clock, make
Interference components in main signal keeps Tong Bu with the interference components in reference signal；The two-way that digital demodulation receiver will receive
The main signal of polarization multiplexing and reference signal, changed main signal and reference signal by respective analog-digital converter ADC respectively
For digital signal, main digital signal is after carrier wave demodulation loop carries out carrier wave demodulation process, extensive by clock recovery loop clock
Obtain the base band component of main signal again；Reference digital signal carries out down coversion by the carrier wave demodulation loop information of main signal, so
Resampling is carried out afterwards, it is thus achieved that the base band component of reference signal by the clock recovery loop information of main signal；Last main signal
The base band component of base band component and reference signal jointly enters cross polarization interference and offsets module, carries out cross polarization and offsets；Ginseng
Examine the base band component of signal in cross polarization interference offsets module, divided by sef-adapting filter output interference signal baseband
Amount, the base band component of main signal deducts the interference signal baseband component of sef-adapting filter output, exports the signal after offseting.
2. the method that cross polarization interference as claimed in claim 1 offsets, it is characterised in that reference signal is by outside numerical control
Agitator carries out down coversion, replaces carrier wave demodulation loop, is converted to zero intermediate frequency signals, the interference components comprising main signal and ginseng
Examine the interference components that signal packet contains and carry out identical frequency-conversion processing, therefore adapt to two different feelings of signal(-) carrier frequency
Condition.
The method that a kind of cross polarization interference the most as claimed in claim 1 offsets, it is characterised in that reference signal is by outside
Clock carries out resampling, replaces clock recovery loop, it is thus achieved that baseband signal；No matter whether main signal and reference signal chip rate
Identical, two interference components, after resampling, still keep consistent.
The method that a kind of cross polarization interference the most as claimed in claim 1 offsets, it is characterised in that cross polarization interference offsets
Module includes: delayer and the sef-adapting filter being made up of transversal filter and decision device etc., and wherein, delayer series connection is adaptive
Answer wave filter.
The method that a kind of cross polarization interference the most as claimed in claim 1 offsets, it is characterised in that assuming that digital demodulation receives
Machine is with the two-way polarization multiplexing signal x received1T () is main signal, x2T () is reference signal, by two-way polarization multiplexing signal x1
(t) and x2T () is respectively by analog-digital converter ADC, carrier wave demodulation or down coversion, resampling acquisition baseband signal；Then two-way
Baseband signal carries out cross polarization and offsets.
6. the method that cross polarization interference as claimed in claim 5 offsets, it is characterised in that main signal passes through carrier wave demodulation ring
Road and clock recovery loop are to main signal x1T () is normally carried out demodulation, complete carrier wave demodulation and clock recovery.
7. the method that cross polarization interference as claimed in claim 6 offsets, it is characterised in that reference signal x2(t) and main signal
x1T the ADC of () shares same sample reference clock fs；By x1T the carrier wave demodulation loop of () provides the sinusoidal component of down coversion with remaining
String component sin/cos, by low-converter to reference signal x2T () carries out down coversion；After down coversion completes, by main signal x1
The symbol synchronization clock f of (t)cTo reference signal x2T () carries out resampling；Finally, main signal x1Two baseband I of (t)x1(n)/
Qx1(n) and x2Two base band component I of (t)x2(n)/Qx2N () jointly enters cross polarization interference and offsets module.
8. the method that cross polarization interference as claimed in claim 5 offsets, it is characterised in that offset mould at cross polarization interference
In block, reference signal x2Two base band component I of (t)x2(n)/Qx2N self adaptation that () forms via transversal filter and decision device
Wave filter output interference signal baseband componentMain signal x1Base band component I of (t)x1(n)/Qx1N () is by prolonging
Device postpones late, exports and disturbs signal baseband componentMain signal x of alignment on time1(t) baseband delays component
Ix1(n+N)/Qx1(n+N)。
9. the method that cross polarization interference as claimed in claim 8 offsets, it is characterised in that the main signal base of delayer output
Band postpones component Ix1(n+N)/Qx1(n+N) with sef-adapting filter output interference signal baseband componentSubtract each other,
Obtain the signal after eliminating interferenceRealize cross polarization and offset function.
10. the method that cross polarization interference as claimed in claim 9 offsets, it is characterised in that eliminate the signal after interferencePass through decision device, it is thus achieved that judgement output demodulated signal Id1(n)/Qd1(n)；Then judgement is exported demodulated signal
Id1(n)/Qd1(n) and the signal eliminated after disturbingSubtract each other acquisition error signal Ie(n)/Qe(n), and by this by mistake
Difference signal Ie(n)/QeN () is multiplied by step factor μ and is fed back to transversal filter, regulate filter coefficient.
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