CN105933052B - Time domain cross polarization interference offsets method - Google Patents
Time domain cross polarization interference offsets method Download PDFInfo
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- CN105933052B CN105933052B CN201610340886.3A CN201610340886A CN105933052B CN 105933052 B CN105933052 B CN 105933052B CN 201610340886 A CN201610340886 A CN 201610340886A CN 105933052 B CN105933052 B CN 105933052B
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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
- H04B7/10—Polarisation diversity; Directional diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3863—Compensation for quadrature error in the received signal
Abstract
The present invention proposes that a kind of time domain cross polarization interference offsets method, it is desirable to provide it is a kind of simple and reliable, complexity it is low offset method.The technical scheme is that: first, phase search unit will be sent into through the two paths of signals I and Q of same A/D sampling clock, it translates in I, Q all the way, two paths of signals is set to be sequentially generated m phase difference, and the related coefficient of I, Q signal is calculated in related coefficient computing unit, after completing m related coefficient calculating, takes the corresponding phase of related coefficient maximum value to export as the signal of phase search unit, complete the phase alignment of I, Q signal；Then, the related coefficient c of aligned position two paths of signals is multiplied into a coefficient k according to experiment or experience setting, polarization interference components intensity of the signal penetration all the way into another way is estimated；Finally, subtracting c*k*I to the road Q signal in interference cancellation unit, the road the I interference permeated in the road Q is eliminated, can similarly eliminate the road the Q interference permeated in the road I.
Description
Technical field
The invention belongs to the interference cancellation classes in high-rate reception demodulator, relate generally to a kind of logical suitable for high speed satellite
The cross polarization interference of letter system regions offsets method.
Background technique
With the development of earth observation technology, the remote sensing information capacity of acquisition increases by geometric progression, and satellite is obtained
Initial data, which transfers back to ground, becomes more and more difficult.The information rate that satellite-ground link needs to transmit is higher and higher, the band of occupancy
It is wide also more and more wider, the inexorable trend of broadband high-speed transmission with having become star data transmission development.Occupy broader frequency band and
Improving frequency spectrum resource utilization rate is to improve two technological approaches of transmission rate, it is clear that it is more worth for improving frequency spectrum resource utilization rate
The technological approaches studied and used.Improving frequency spectrum resource utilization rate, there are mainly two types of methods: first is that using M-ary digital modulation
(including amplitude, frequency, phase and its combined modulation) system improves the transmitted bit number of unit bandwidth or every symbol；It is another
Kind method is to utilize the polarized wave of a pair of orthogonal simultaneously in identical frequency band using channeling (also referred to as polarization multiplexing) technology
2 carrier signals are transmitted, realize that transmission capacity doubles, this is a kind of not only practical but also economic side for improving frequency spectrum resource utilization rate
Method.But in high speed satellite communication system, polarization multiplexing technology has an inevitable problem precisely due to transmission channel
The factors such as non-ideal characteristic, ionosphere depolarising, antenna physical error cause to exist to a certain degree between two-way orthogonal signalling
Cross polarization interference, i.e. the two-way orthogonally polarized signal of simultaneous transmission has Partial Power and is leaked to another polarization direction
On, cross polarization interference is caused, communication system performance is deteriorated.In order to eliminate cross jamming in two polarization directions or
It improves the polarization isolation of antenna or uses cross polarization interference technology for eliminating.Isolation due to improving antenna can be significantly
Increase the manufacturing cost of antenna, and increase rate is limited；Therefore, polarize interference cancellation technology (XPIC, Cross
Polarization Interference Cancellation) become high speed satellite communication system one of key technology.
The elimination of cross polarization interference is generally using polarization interference canceller (s (XPIC).There are many structure of XPIC is general:
1st kind is that the transversal filter equilibrium based on LMS/RLS offsets structure, and it is synchronous, packet that this method, which needs two polarized signals,
The signal delay for including respective carrier wave, sign synchronization and two-way is consistent, and the performance offseted can just be guaranteed, is realized
Complexity is relatively large.2nd kind is to offset structure based on the combined equilibrium that polarizes, and complexity is bigger, since it divides interference
Amount extracts, and the branch road for being added to useful is enhanced detection performance, obtains diversity and merge gain.3rd kind is to be based on
The thinking that signal correlation offsets in the presence of interference, has certain related since two paths of signals is independent random process
Property, interference signal is the interference components in main channel multiplied by related coefficient.
From the point of view of the position of canceller, XPIC can be the canceller based on sampling after A/D, and it is same to be also possible to receiver
Canceller based on mark space or over-sampling mark space after walking.Therefore polarization interference volume (XPI, Cross
Polarization Interference) estimation can be the error extractive technique based on judgement, be also possible to based on correlation
Interference extractive technique.
Have three in place of above-mentioned the shortcomings of the prior art:
First is that the operating condition of polarization interference canceller (s requires harshness.Such as the transversal filter based on LMS/RLS is balanced
It must be synchronous, including respective carrier synchronization and sign synchronization and two-way that canceller method, which requires two polarized signals,
Signal delay must be consistent, just can guarantee the working performance of canceller.
Second is that implementation complexity is larger, to resource requirement height.For meet first point requirement, need to XPIC module carry out compared with
Complicated design, such as: the design of low-pass filter, multiphase filter structure design of parallel receiver etc. need largely to multiply
Musical instruments used in a Buddhist or Taoist mass resource, therefore the FPGA resource of realization algorithm is required also higher.
Third is that the adaptability of interference canceller (s.Current major part XPIC canceller is placed in after receiver synchronizes, and is based on
Mark space or over-sampling mark space can not handle signal because of the feelings that polarization interference causes receiver that can not synchronize
Condition.
Summary of the invention
In order to overcome deficiency existing for existing cross-polarization canceller technology, the present invention provides a kind of simple and reliable, complicated
Spend it is low, do not require the operations such as signal carrier is synchronous, demodulation decision error is extracted, mould is transmitted for different modulating and code communication
Consistent cross polarization interference offsets method under formula.
Above-mentioned purpose of the invention is reached by following measures.Firstly, a pair is sampled by same A/D sampling clock
Base band quadrature polarized signal, be denoted as the road I and the road Q respectively, be sent into phase search unit, phase search unit searches I, Q two-way
The aligned position of signal, by all the way, making two paths of signals be sequentially generated m phase difference, and in phase in translation I, Q two paths of signals
The related coefficient that I, Q two paths of signals are calculated in coefficient calculation unit is closed, to the phase of each translation I of phase difference calculating, Q signal
Relationship number takes the corresponding phase of related coefficient maximum value as phase search unit after completing m signal related coefficient calculating
Signal output, completes the phase alignment of I, Q two paths of signals；Then, by the related coefficient c of aligned position two paths of signals multiplied by one
According to the coefficient k of experiment or experience setting, signal penetration all the way is carried out to the polarization interference components intensity x in another way signal
Estimation；Finally, subtracting c*k*I to the road Q signal in interference cancellation unit, it is dry that the road the I signal permeated in the signal of the road Q can be eliminated
It disturbs；Similarly eliminate the road I signal in the road Q infiltration interference, wherein m be search phase sum and, n is natural number.
The beneficial effect of present invention method compared with prior art is:
It is simple and reliable, complexity is low.The present invention is directly based upon A/D sample progress time domain cross polarization interference and offsets,
All calculating carry out in the time domain.Related coefficient computing unit is using parallel multiplier, the parallel adder, product being sequentially connected in series
Zero filter IDF (Integrate and Dump Filter) and moving average filter MA (Moving Average) is distinguished to constitute
Cascade structure avoids the multiphase filter structure of parallel receiver instead of low-pass filter, simplifies algorithm design.In FPGA
In realization, related coefficient calculates structure other than using correlator multiplier, without multiphase filter structure and a large amount of multiplier resources,
FPGA resource is greatly saved, the implementation complexity of algorithm is enormously simplified while taking into account interference canceller (s performance.
The operations such as signal carrier is synchronous, demodulation decision error is extracted are not required, in different modulating and code communication mode
Under, it is with uniformity.Cross polarization interference of the invention offsets method after A/D sampling and before carrier synchronization, only
The estimation and elimination that polarization interference is carried out using A/D sampled signal, polarization offsets scheme before belonging to a kind of inspection, therefore does not require to carry
The operations such as wave is synchronous, demodulation decision error is extracted.Simultaneously because the estimation of entire polarization interference and eliminating process and signal
Modulation system and coding mode are unrelated, the correlation being only dependent upon between signal, therefore this method is logical in different modulating and coding
It is with uniformity under letter mode, it avoids due to modulating the difference with code communication mode and needs to interfere using different polarization
Removing method needs to carry out parameter adjustment.
The present invention is suitable for space flight measurement and control, satellite remote sensing etc. using the receiver device with frequency polarized channel multiplexing.It can be wide
It is general to be applied to the transmission of broadband satellite signal, remote sensing and high-speed radio signal processing.
Detailed description of the invention
Fig. 1 is the overall connection block diagram of time domain cross polarization interference canceller of the present invention.
Fig. 2 is the working principle diagram of Fig. 1 phase search unit.
Fig. 3 is related coefficient computing unit working principle diagram.
Fig. 4 is Fig. 1 interference cancellation cell operation schematic diagram.
Specific embodiment
This method is further illustrated with reference to the accompanying drawings and detailed description.
Refering to fig. 1.I, Q two paths of signals is considered as independent random process, therefore only when there are cross polarizations to do between I, Q
When disturbing, can just there be certain correlation between I, Q two paths of signals, which derives from the friendship that I, Q two paths of signals interpenetrate
Fork interference, this correlation can be calculated by related coefficient computing unit.Since I, Q two paths of signals are in the processes such as transmission and sampling
In may generate phase offset, therefore using phase search unit searches and the phase offset between I, Q need to be corrected.Enable I and Q
For a pair of orthogonal signalling by downconverting to base band, there is the cross polarization interference to interpenetrate between I, Q, below to eliminate
For the road I signal is to the polarization interference of the road Q signal.It is dry to the polarization of the road I signal that the road Q signal can be eliminated using same method
It disturbs.
Firstly, a pair of of base band quadrature polarized signal is carried out A/D sampling using same sample frequency, it is denoted as the road I letter respectively
Number and the road Q signal, be sent into phase search unit carry out signal alignment, two are searched for by way of traversal search within the set range
The aligned position of road signal, to compensate the signal phase as caused by the non-ideal characteristic of signals transmission between the signal of the road I, Q
Position offset.In phase search unit, using sliding, signal, another way signal keep the way of search of phase invariant all the way, will
Signal respectively forwardly or slides backward m/2 or m/2-1 (m=2 all the wayn), wherein m is search phase sum, and n is natural number, n
Value be determined according to the issuable phase offset of two paths of signals, representative value 6.To eliminate the road I signal to the road Q signal
Polarization interference for, keep the road I signal phase it is constant, the road Q signal is slided, and the sliding each time to the road Q signal is all counted
The related coefficient for calculating and recording the road I and the road Q signal can get two paths of signals in m different discrete phase in a next round is sought
The related coefficient of position position, the corresponding phase of related coefficient maximum value is that I, Q two paths of signals phase are currently aligned in a wheel
Position.It will be exported together after the road Q parallel moving of signal to the corresponding phase of related coefficient maximum value with the road I signal, that is, eliminate I, Q
The phase offset of two paths of signals.Then, the related coefficient c of aligned position two paths of signals is set multiplied by one according to experiment or experience
Fixed coefficient k estimates signal penetration all the way to the interference components intensity x in another way signal；In interference cancellation unit
In, c*k*I is subtracted to the road Q signal, the road the I signal interference permeated in the signal of the road Q can be eliminated；Q in the signal of the road I can similarly be eliminated
The infiltration on road is interfered.Above-mentioned signal alignment process is a circulation, and in order to track the variation of the characteristic of channel, phase search unit exists
After every m related coefficient of progress calculates, repaired according to translation phase of the new maximum correlation coefficient corresponding phase to the road Q signal
Just.Wherein, the signal related coefficient of phase search unit is calculated by related coefficient computing unit.Related coefficient calculates single
The grade that member is constituted using the parallel multiplier, parallel adder, integrate-dump filter IDF and the moving average filter MA that are sequentially connected in series
It is coupled structure, sums again after calculating the discrete signal value multiplication of two paths of signals corresponding position, can be obtained the phase relation of two paths of signals
Numerical value；Finally, the related coefficient c of aligned position two paths of signals is multiplied by an estimation coefficient k according to experiment or experience setting, it is right
Signal penetration is estimated to the interference components intensity x in another way signal all the way；In interference cancellation unit, to the road Q signal
The road the I signal for subtracting c*k weighting, can eliminate the road the I signal interference permeated in the road Q；Same method can eliminate the road I signal
The infiltration of the middle road Q signal is interfered.
Refering to Fig. 2.The target of phase search unit is to find the phase alignment position of I, Q two paths of signals, to eliminate the road I, Q
Phase offset between signal, in order to subsequent interference removal process.The search phase sum that phase search unit is set as
M, m=2n, n is natural number, and distributes m related coefficient memory space, for storing the corresponding related coefficient of each phase, phase
Position search carries out in this m phase.The road I phase remains unchanged in search process, puts down forward centered on Q Lu Yiqi original phase
It moves and obtains m/2 forward phase, translation obtains m/2-1 backward phases backward.The related coefficient of each phase position I, Q signal
It is calculated, and stored by related coefficient computing unit, until m phase traversal is completed.Using I, Q signal related coefficient as
Criterion, by comparing the maximum value obtained in m related coefficient, which is the corresponding road I, Q signal alignment
The road Q parallel moving of signal to the phase output is obtained the alignment of I, Q two paths of signals by phase；Then, aligned position two-way is believed
Number related coefficient c multiplied by one according to experiment or experience setting coefficient k, to signal penetration all the way into another way signal
Interference components intensity x is estimated；In interference cancellation unit, c*k*I is subtracted to the road Q signal, can eliminate and be permeated in the signal of the road Q
The road I signal interference；The infiltration interference on the road Q in the signal of the road I can similarly be eliminated.For the variation of the tracking satellite characteristic of channel, i.e.,
The phase offset on the road I, Q can be slowly varying with the time in signals transmission, therefore above-mentioned phase search process is one
Circulation, one next round of every progress are sought, is i.e. after m phase search, is once updated to the output phase on the road Q.
Refering to Fig. 3.The length selection of reasonable integrate-dump filter IDF and moving average filter MA is that related coefficient calculates
As a result smooth, at the same again can reaction signal correlativity variation in time guarantee.Related coefficient computing unit is using in sequential series
Parallel multiplier, parallel adder, integrate-dump filter IDF and moving average filter MA constitute cascade structure, calculate I, Q two
Railway digital signal corresponding position signal value is summed after being multiplied.Wherein, the realization of moving average filter MA is based on accumulator and delay
Phase reducing.Integrate-dump filter exports accumulation result after the cumulative data for completing setting length every time, and resets tired
Add device to carry out accumulating operation next time, is functionally similar to a low-pass filter.The output of integrate-dump filter as a result,
It is sent to moving average filter MA, further progress sliding window filtering operation.
Refering to Fig. 4.I, after Q two paths of signals phase alignment, estimated using the related coefficient c of current phase position multiplied by one
Meter coefficient k (k needs are set and adjusted according to experimental result), penetrates into the interference in disturbed signal Q to interference signal I
Component intensity x is estimated.The road the I signal for subtracting c*k weighting to disturbed signal Q in interference cancellation unit, can eliminate I
Road signal penetration is interfered to the polarization in the signal of the road Q.Using same method, the road Q signal penetration can be eliminated into the road I signal
Polarization interference.
Claims (10)
1. a kind of time domain cross polarization interference offsets method, it is characterised in that include the following steps: firstly, by a pair by same
The base band quadrature polarized signal of A/D sampling clock sampling, is denoted as the road I and the road Q respectively, is sent into phase search unit, phase search
The aligned position of unit searches I, Q two paths of signals, by all the way, two paths of signals being made to be sequentially generated m in translation I, Q two paths of signals
A phase difference, related coefficient computing unit is using parallel multiplier, parallel adder, the integrate-dump filter being sequentially connected in series
IDF and moving average filter MA constitutes cascade structure, and the related coefficient of I, Q two paths of signals is calculated in related coefficient computing unit, right
The related coefficient of each translation I of phase difference calculating, Q signal take related coefficient after completing m signal related coefficient calculating
The corresponding phase of maximum value is exported as the signal of phase search unit, completes the phase alignment of I, Q two paths of signals, then by the road Q
It is exported together after parallel moving of signal to the corresponding phase of related coefficient maximum value with the road I signal, the phase for eliminating I, Q two paths of signals is inclined
It moves；Then, by the related coefficient c of aligned position two paths of signals multiplied by a coefficient k according to experiment or experience setting, to all the way
The polarization interference components intensity x that signal I is penetrated into another way signal Q is estimated；Finally, in interference cancellation unit, to Q
Road signal subtracts c*k*I, eliminates the road the I signal interference permeated in the signal of the road Q；The infiltration for similarly eliminating the road Q in the signal of the road I is dry
It disturbs, wherein m is search phase sum and m=2n, n is natural number, and the value of n is inclined according to the issuable phase of two paths of signals
Shifting is determined.
2. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: the setting of phase search unit
Search phase sum is m, and distributes m related coefficient memory space, for storing the corresponding related coefficient of each phase position,
Phase search carries out in this m phase.
3. time domain cross polarization interference as claimed in claim 2 offsets method, it is characterised in that: phase search unit searches mistake
The road I phase remains unchanged in journey, translates forward centered on Q Lu Yiqi original phase and obtains m/2 forward phase, and translation obtains backward
M/2-1 backward phases, and using I, Q signal related coefficient as criterion, compare the related coefficient of m phase position, time
It goes through and obtains related coefficient maximum value.
4. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: phase search unit is to every m
The secondary road Q sliding, updates the road the Q phase once exported.
5. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: the road Q signal is slided each time
It is dynamic, calculate and record the related coefficient of I, Q two paths of signals, obtained in a next round is sought two paths of signals m sequentially from
The related coefficient of dephasing potential difference position, wherein m is search phase sum and m=2n, n is natural number, and the value of n is according to two-way
The issuable phase offset of signal is determined.
6. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: when m related coefficient calculates
After out, the corresponding phase position of maximum related coefficient is the aligned position of I, Q two paths of signals, at this point, phase search list
The road Q parallel moving of signal to the position is completed the phase alignment of I, Q two paths of signals by member, and remain to m related coefficient of next round
It recalculates and finishes.
7. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: the realization of moving average filter MA
Phase reducing based on accumulator and delay.
8. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: integrate-dump filter is every
After the secondary cumulative data for completing setting length, accumulation result is exported, and reset accumulator to carry out accumulating operation next time.
9. time domain cross polarization interference as claimed in claim 7 offsets method, it is characterised in that: integrate-dump filter it is defeated
Out as a result, being sent to moving average filter MA, further progress sliding window filtering operation.
10. time domain cross polarization interference as described in claim 1 offsets method, it is characterised in that: in interference cancellation unit
The road the I signal that c*k weighting is subtracted to disturbed signal Q can eliminate the road I signal penetration to the polarization interference in the signal of the road Q.
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| CN108616476B (en) * | 2018-03-18 | 2021-03-09 | 西安电子科技大学 | Cross polarization interference elimination system and method suitable for high-order modulation mode |
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