CN102404272A - System and a method for processing wireless signals based on coded orthogonal frequency division multiplexing - Google Patents

System and a method for processing wireless signals based on coded orthogonal frequency division multiplexing Download PDF

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CN102404272A
CN102404272A CN2011104140318A CN201110414031A CN102404272A CN 102404272 A CN102404272 A CN 102404272A CN 2011104140318 A CN2011104140318 A CN 2011104140318A CN 201110414031 A CN201110414031 A CN 201110414031A CN 102404272 A CN102404272 A CN 102404272A
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burst
signal sequence
cofdm
fft
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CN102404272B (en
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吴华夏
徐劲松
杨良勇
刘劲松
孙英良
方小伟
张铭权
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Anhui aviation optoelectronic Research Institute Co.,Ltd.
Anhui Huamin Avionics System Co ltd
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Anhui East China Institute of Optoelectronic Technology
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Abstract

The invention relates to a system and a method for processing wireless signals based on coded orthogonal frequency division multiplexing, which can reduce the peak-to-average-power ratio of the wireless signals. The invention provides a method and a system for reducing the peak-to-average-power ratio by combining dynamic constellation expansion with arranging sub-carrier channels based on researching the current method for reducing the peak-to-average-power ratio so as to effectively solve the conflicts on the peak-to-average-power ratio with error code ratio of transmission, transmission efficiency and complexity of realization and improve the comprehensive performance. The invention is suitable for the fields of multi-carrier communication, portable wireless video communication, handheld transmission terminals and high-efficiency radio frequency communication.

Description

Wireless signal treatment system and method based on COFDM
Technical field
The present invention relates to wireless communication field, be specifically related to wireless signal treatment system and method based on the reduced peak-to-average force ratio of COFDM.
Background technology
In recent years; Rise along with cordless communication networks such as GPRS, CDMA, 3G (TD-SCDMA, WCDMA, CDMA2000), OFDM; Wireless video transmission system is with its maneuverability, visual pattern, advantage such as easy to operate; Be widely used in every field such as army individual-soldier operation, public security remote monitoring evidence obtaining, TV programme relay, the monitoring of mine oilfield safety, the environmental monitoring of underground garage supermarket, cell environment monitoring, and become that people realize at a distance, a kind of important means of on-site supervision on a large scale.COFDM (Coded Orthogonal Frequency Division Multiplexing; COFDM) transmission rate of technology is high, antijamming capability is strong, and this makes realizes that at " in the high-speed motion " and " non-looking under the poker spare " high-quality realtime graphic and transfer of data become possibility.
Ofdm signal is independently to be formed through the sub-carrier signal addition of ovennodulation by a plurality of; The peak value average power ratio is one of intrinsic problem of ofdm system, and the amplifier in the transmitter has been proposed very high linear requirement, when the range of linearity of amplifier can not satisfy the signal variation; Will produce nonlinear distortion to the bigger signal of dynamic range; The frequency spectrum of ofdm signal is changed, destroy the orthogonality of each sub-channel signal, thereby cause the deterioration of whole system performance.
Because ofdm signal time domain waveform envelope has unsteadiness, how to suppress to send the signal peak-to-average power specific characteristic and has caused extensive studies interest.Reduce the method for peak-to-average force ratio at present and probably divide three types: signal distortion technology, probability class methods and coding method.The signal distortion technology is to carry out nonlinear distortion through the signal before the pair amplifier to reach reduction peak-to-average force ratio purpose; Like margining amplitude technique; These class methods are direct, simple, complexity is low, but the signal distortion meeting brings the outer interference of in-band noise and band, thereby reduce the BER performance and the spectrum efficiency of system; The probability class methods are that signal is carried out linear process, reduce the probability that peak value occurs as far as possible.Have can not make that signal distorts, it uses and does not receive advantages such as carrier number restriction, frequency spectrum loss be little, but these class methods are cost to the performance that peak-to-average force ratio reduces to increase system complexity.Thereby coding method reduces peak-to-average force ratio through avoiding the use of those coding patterns that can generate big peak power signal; For example adopt the coding round-robin method; This method reduces effective to peak-to-average force ratio, can not cause signal distortion, but has shortcomings such as coding pattern quantity is few, code efficiency is low.
More than these methods respectively have shortcoming, can regard the compromise of peak-to-average force ratio rejection and different factors such as transmission performance, spectrum efficiency, implementation complexity as, therefore study novel reduction peak-to-average force ratio algorithm and have very important significance for improving systematic function.
Summary of the invention
In view of this, the present invention provides a kind of wireless signal processing methods that reduces the wireless signal peak-to-average force ratio.
The present invention is achieved in that a kind of wireless signal processing methods based on COFDM, and it comprises the steps:
Step 1: frequency-region signal sequence
Figure 2011104140318100002DEST_PATH_IMAGE001
is carried out N point IFFT conversion, the time-domain signal sequence that obtains
Figure 288788DEST_PATH_IMAGE002
;
Step 2: time-domain signal sequence
Figure 2011104140318100002DEST_PATH_IMAGE003
is carried out 4 times successively rise sampling and π/4 LPFs, the burst that obtains
Figure 41455DEST_PATH_IMAGE004
;
Step 3: the burst to carries out the amplitude limiting processing of amplitude thresholding for , the burst that obtains
Figure 775373DEST_PATH_IMAGE006
;
Step 4: the burst to
Figure 310260DEST_PATH_IMAGE006
carries out π/4 LPFs, 4 times of down-samplings and FFT successively and changes the frequency-region signal sequence that obtains
Figure 2011104140318100002DEST_PATH_IMAGE007
;
Step 5: will X c Frequency-region signal sequence and X burst subtract each other, through the gain after again with the addition of X burst, obtain
Figure 971179DEST_PATH_IMAGE008
Burst;
Step 6: right
Figure 958727DEST_PATH_IMAGE008
the real and imaginary parts for the limiter to get
Figure 2011104140318100002DEST_PATH_IMAGE009
signal sequence;
Step 7: right
Figure 996084DEST_PATH_IMAGE010
the real and imaginary parts choose to build to get
Figure 2011104140318100002DEST_PATH_IMAGE011
signal sequence;
Step 8:
Figure 189737DEST_PATH_IMAGE011
carried out the FFT conversion, obtain the burst of
Figure 474088DEST_PATH_IMAGE012
.
The present invention also provides a kind of wireless signal treatment system that reduces the wireless signal peak-to-average force ratio.
A kind of wireless signal treatment system based on COFDM; It is characterized in that; Comprise that IFFT converter, 4 times rise sampler, a π/4 low pass filters, amplitude limiter, the 2nd π/4 low pass filters, 4 times of down-samplers, a FFT converter, first adder, gain controller, second adder, limit filtration device, constellation extension device and the 2nd FFT converters, the input termination of IFFT converter
Figure 948932DEST_PATH_IMAGE001
The frequency-region signal sequence, right XBurst carries out N point IFFT conversion, obtains
Figure 711352DEST_PATH_IMAGE002
The time-domain signal sequence, 4 times rise sampler and a π/4 low pass filters with the time-domain signal sequence
Figure 705984DEST_PATH_IMAGE003
Carry out 4 times successively and rise sampling and π/4 LPFs, obtain
Figure 223553DEST_PATH_IMAGE004
Burst, amplitude limiter is right
Figure 936425DEST_PATH_IMAGE004
Burst carry out the amplitude thresholding and do
Figure 502535DEST_PATH_IMAGE005
Amplitude limiting processing, obtain
Figure 600941DEST_PATH_IMAGE006
Burst, the 2nd π/4 low pass filters, 4 times of down-samplers and a FFT converter are right
Figure 227095DEST_PATH_IMAGE006
Burst carry out π/4 LPFs, 4 times of down-samplings and FFT conversion successively, obtain
Figure 427263DEST_PATH_IMAGE007
The frequency-region signal sequence, first adder will X c The frequency-region signal sequence with XBurst subtracts each other, and gain controller gains to the output signal of first adder, second adder to the output signal of gain controller with XThe burst addition obtains
Figure 593802DEST_PATH_IMAGE008
Burst, the limit filtration device is right
Figure 749977DEST_PATH_IMAGE008
Real part and imaginary part carry out respectively obtaining behind the amplitude limit
Figure 357151DEST_PATH_IMAGE009
Burst, the constellation extension device is right
Figure 28304DEST_PATH_IMAGE010
Real part and imaginary part select to make up and obtain
Figure 14846DEST_PATH_IMAGE011
Burst, the 2nd FFT converter is right Carry out the FFT conversion, obtain
Figure 55800DEST_PATH_IMAGE012
Burst.
Preferably, the burst of above-mentioned
Figure 151932DEST_PATH_IMAGE006
satisfies following condition:
Figure 2011104140318100002DEST_PATH_IMAGE013
。
Preferably, the burst of above-mentioned
Figure 473323DEST_PATH_IMAGE009
satisfies following condition:
Figure 604090DEST_PATH_IMAGE014
。
Preferably, the burst of above-mentioned
Figure 555997DEST_PATH_IMAGE011
satisfies following condition:
Figure 2011104140318100002DEST_PATH_IMAGE015
。
The present invention is on the existing reduction of research Peak-to-Average Power Ratio method basis; Proposition utilizes the method and system of the reduction peak-to-average force ratio that dynamic constellation extension combines with the preserved sub-carrier passage; Thereby effectively solve the contradiction of aspects such as peak-to-average force ratio and transmission error rates, efficiency of transmission, implementation complexity, the elevator system combination property.
Description of drawings
The sketch map that Fig. 1 provides for the embodiment of the invention based on the wireless signal treatment system of COFDM.
Signal power and the average power of Fig. 2 for not passing through any processing.
Fig. 3 is through signal power and average power behind the amplitude limit.
Fig. 4 is wireless signal processing methods and resultant signal power of wireless signal treatment system and an average power of utilizing the embodiment of the invention to provide.
Fig. 5 is that the error rate of amplitude limit algorithm and algorithm of the present invention compares.
Symbol description
The IFFT converter 1
4 times rise sampler 2
The one π/4 low pass filters 3
Amplitude limiter 4
The 2nd π/4 low pass filters 5
4 times of down-samplers 6
The one FFT converter 7
First adder 8
Gain controller 9
Second adder 10
The limit filtration device 11
The constellation extension device 12
The 2nd FFT converter 13
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of wireless signal processing methods based on COFDM, and it comprises the steps:
Step 1: frequency-region signal sequence
Figure 201742DEST_PATH_IMAGE001
is carried out N point IFFT conversion, the time-domain signal sequence that obtains
Figure 267437DEST_PATH_IMAGE002
.
Step 2: time-domain signal sequence
Figure 315027DEST_PATH_IMAGE003
is carried out 4 times successively rise sampling and π/4 LPFs, the burst that obtains
Figure 624786DEST_PATH_IMAGE004
.
Step 3: the burst to
Figure 508559DEST_PATH_IMAGE004
carries out the amplitude limiting processing of amplitude thresholding for
Figure 561966DEST_PATH_IMAGE005
; Obtain the burst of
Figure 464063DEST_PATH_IMAGE006
, wherein
Figure 757772DEST_PATH_IMAGE016
Step 4: the burst to
Figure 50213DEST_PATH_IMAGE006
carries out π/4 LPFs, 4 times of down-samplings and FFT successively and changes the frequency-region signal sequence that obtains
Figure 969627DEST_PATH_IMAGE007
.
Step 5: will X c Frequency-region signal sequence and X burst subtract each other, through the gain after again with the addition of X burst, obtain
Figure 663914DEST_PATH_IMAGE008
Burst,
Figure 2011104140318100002DEST_PATH_IMAGE017
, wherein G is planisphere development method (Active Constellation Extension, expansion gain ACE).
Step 6: real part to
Figure 190841DEST_PATH_IMAGE008
and the burst that imaginary part carries out obtaining behind the amplitude limit
Figure 46277DEST_PATH_IMAGE009
respectively; Guarantee that the individual unit amplitude can not surpass set-point L, L is the amplitude limit thresholding of ACE algorithm.The burst of
Figure 503803DEST_PATH_IMAGE009
satisfies following condition:
Figure 52597DEST_PATH_IMAGE014
Step 7: real part to
Figure 953688DEST_PATH_IMAGE010
and imaginary part are selected to make up the burst that obtains
Figure 283038DEST_PATH_IMAGE011
, and the burst of satisfies following condition:
Figure 698287DEST_PATH_IMAGE015
Wherein, Can expand its value of expression in the formula and be not more than maximum on the planisphere; Like QPSK, its value is not more than maximum
Figure 19547DEST_PATH_IMAGE018
.
Step 8: carried out the FFT conversion, obtain the burst of
Figure 386254DEST_PATH_IMAGE012
.
For implementing said method; The embodiment of the invention provides a kind of wireless signal treatment system based on COFDM as shown in Figure 1, and it comprises that 1,4 times in IFFT converter rises sampler 2, a π/4 low pass filter 3, amplitude limiter 4, the 2nd π/5,4 times of down-samplers of 4 low pass filters 6, a FFT converter 7, first adder 8, gain controller 9, second adder 10, limit filtration device 11, constellation extension device 12 and the 2nd FFT converter 13.This wireless signal treatment system programmable logic device FPGA capable of using makes up hardware and implements.
1,4 times in IFFT converter rises sampler 2, a π/4 low pass filter 3, amplitude limiter 4, the 2nd π/5,4 times of down-samplers of 4 low pass filters 6, a FFT converter 7 and connects successively.The input termination of IFFT converter 1
Figure 909639DEST_PATH_IMAGE001
The frequency-region signal sequence, right XBurst carries out N point IFFT conversion, obtains The time-domain signal sequence.4 times rise sampler 2 and a π/4 low pass filters 3 and time-domain signal sequence
Figure 205545DEST_PATH_IMAGE003
is carried out 4 times successively rise sampling and π/4 LPFs, the burst that obtains
Figure 746247DEST_PATH_IMAGE004
.The burst of amplitude limiter 4 to
Figure 937188DEST_PATH_IMAGE004
carries out the amplitude limiting processing of amplitude thresholding for
Figure 537934DEST_PATH_IMAGE005
, the burst that obtains
Figure 63593DEST_PATH_IMAGE006
.The 2nd π/5,4 times of down-samplers 6 of 4 low pass filters and the burst of a FFT converter 7 to
Figure 221036DEST_PATH_IMAGE006
carry out π/4 LPFs, 4 times of down-samplings and FFT conversion, the frequency-region signal sequence that obtains
Figure 719014DEST_PATH_IMAGE007
successively.First adder 8 will X c The frequency-region signal sequence with XBurst subtracts each other, and the output signal of 9 pairs of first adders 8 of gain controller gains, the output signal of 10 pairs of gain controllers 9 of second adder with XThe burst addition obtains
Figure 287398DEST_PATH_IMAGE008
Burst.Limiting filter 11 pairs
Figure 316665DEST_PATH_IMAGE008
the real and imaginary parts obtained for limiting
Figure 261487DEST_PATH_IMAGE009
the signal sequence.Constellation Expander 12 pairs
Figure 424091DEST_PATH_IMAGE010
The real and imaginary parts choose to build to get
Figure 101060DEST_PATH_IMAGE011
The signal sequence.The 2nd FFT converter 13 carries out the FFT conversion to
Figure 601312DEST_PATH_IMAGE011
, obtains the burst of
Figure 100557DEST_PATH_IMAGE012
.
Adopt simulating analysis to verify the performance of above-mentioned wireless signal processing methods and wireless signal treatment system.The information source of native system partly adopts pseudo-random sequence generator to produce pseudo random sequence, obtains complex signal through constellation mapper, and basic parameter is following: carrier number N=1512; Sampling multiple 4; Constellation modulation system: QPSK; ACE amplitude limit thresholding L gets the arbitrary number between 0.7～1.4; Arbitrary integer between gain G gets 0～31; 3 times of the signal amplitude thresholding number of winning the confidence average.Signal power and the average power of Fig. 2 for not passing through any processing; Fig. 3 is that Fig. 4 is wireless signal processing methods and resultant signal power of wireless signal treatment system and an average power of utilizing the embodiment of the invention to provide through signal power and average power behind the amplitude limit.Among Fig. 2 to Fig. 4, abscissa is the signal subscript, and ordinate is ratio dB.Fig. 5 compares for the error rate of amplitude limit algorithm with the unified algorithm that the present invention is based on ACE.Fig. 2 to Fig. 5 shows that wireless signal processing methods that is adopted and wireless signal treatment system can obviously reduce peak-to-average force ratio, and keeps error performance preferably.
The present invention is on the existing reduction of research Peak-to-Average Power Ratio method basis; A kind of method and system that utilizes the reduction peak-to-average force ratio that dynamic constellation extension combines with the preserved sub-carrier passage is proposed; Thereby effectively solve the contradiction of aspects such as peak-to-average force ratio and transmission error rates, efficiency of transmission, implementation complexity, the elevator system combination property.The present invention is applicable to fields such as multi-carrier wireless communication, portable mobile wireless video communication, hand-hold type transmission terminal and efficient radio frequency communication.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. based on the wireless signal processing methods of COFDM, it comprises the steps:
Step 1: frequency-region signal sequence
Figure 2011104140318100001DEST_PATH_IMAGE001
is carried out N point IFFT conversion, the time-domain signal sequence that obtains
Figure 672680DEST_PATH_IMAGE002
;
Step 2: time-domain signal sequence
Figure 2011104140318100001DEST_PATH_IMAGE003
is carried out 4 times successively rise sampling and π/4 LPFs, the burst that obtains
Figure 527504DEST_PATH_IMAGE004
;
Step 3: the burst to
Figure 244924DEST_PATH_IMAGE004
carries out the amplitude limiting processing of amplitude thresholding for , the burst that obtains ;
Step 4: the burst to
Figure 392188DEST_PATH_IMAGE006
carries out π/4 LPFs, 4 times of down-samplings and FFT successively and changes the frequency-region signal sequence that obtains
Figure 2011104140318100001DEST_PATH_IMAGE007
;
Step 5: will X c Frequency-region signal sequence and X burst subtract each other, through the gain after again with the addition of X burst, obtain
Figure 149404DEST_PATH_IMAGE008
Burst;
Step 6: right
Figure 354121DEST_PATH_IMAGE008
the real and imaginary parts obtained for Limiting
Figure 2011104140318100001DEST_PATH_IMAGE009
signal sequence;
Step 7: right
Figure 428387DEST_PATH_IMAGE010
The real and imaginary parts choose to build to get signal sequence;
Step 8:
Figure 34949DEST_PATH_IMAGE011
carried out the FFT conversion, obtain the burst of
Figure 28313DEST_PATH_IMAGE012
.
2. the wireless signal processing methods based on COFDM as claimed in claim 1; It is characterized in that; In step 3, the burst of
Figure 720325DEST_PATH_IMAGE006
satisfies following condition:
Figure 2011104140318100001DEST_PATH_IMAGE013
。
3. the wireless signal processing methods based on COFDM as claimed in claim 1; It is characterized in that; In step 6, the burst of
Figure 395020DEST_PATH_IMAGE009
satisfies following condition:
Figure 856089DEST_PATH_IMAGE014
。
4. the wireless signal processing methods based on COFDM as claimed in claim 1; It is characterized in that; In step 7, the burst of
Figure 285933DEST_PATH_IMAGE011
satisfies following condition:
。
5. based on the wireless signal treatment system of COFDM; It is characterized in that; Comprise that IFFT converter, 4 times rise sampler, a π/4 low pass filters, amplitude limiter, the 2nd π/4 low pass filters, 4 times of down-samplers, a FFT converter, first adder, gain controller, second adder, limit filtration device, constellation extension device and the 2nd FFT converters, the input termination of IFFT converter
Figure 468171DEST_PATH_IMAGE001
The frequency-region signal sequence, right XBurst carries out N point IFFT conversion, obtains
Figure 618661DEST_PATH_IMAGE002
The time-domain signal sequence, 4 times rise sampler and a π/4 low pass filters with the time-domain signal sequence
Figure 262132DEST_PATH_IMAGE003
Carry out 4 times successively and rise sampling and π/4 LPFs, obtain
Figure 534981DEST_PATH_IMAGE004
Burst, amplitude limiter is right
Figure 263903DEST_PATH_IMAGE004
Burst carry out the amplitude thresholding and do
Figure 280401DEST_PATH_IMAGE005
Amplitude limiting processing, obtain
Figure 716061DEST_PATH_IMAGE006
Burst, the 2nd π/4 low pass filters, 4 times of down-samplers and a FFT converter are right Burst carry out π/4 LPFs, 4 times of down-samplings and FFT conversion successively, obtain
Figure 376030DEST_PATH_IMAGE007
The frequency-region signal sequence, first adder will X c The frequency-region signal sequence with XBurst subtracts each other, and gain controller gains to the output signal of first adder, second adder to the output signal of gain controller with XThe burst addition obtains
Figure 258535DEST_PATH_IMAGE008
Burst, the limit filtration device is right
Figure 548702DEST_PATH_IMAGE008
Real part and imaginary part carry out respectively obtaining behind the amplitude limit
Figure 491250DEST_PATH_IMAGE009
Burst, the constellation extension device is right
Figure 863938DEST_PATH_IMAGE010
Real part and imaginary part select to make up and obtain
Figure 222238DEST_PATH_IMAGE011
Burst, the 2nd FFT converter is right
Figure 694808DEST_PATH_IMAGE011
Carry out the FFT conversion, obtain
Figure 745941DEST_PATH_IMAGE012
Burst.
6. the wireless signal treatment system based on COFDM as claimed in claim 5; It is characterized in that the burst of
Figure 608854DEST_PATH_IMAGE006
satisfies following condition:
。
7. the wireless signal treatment system based on COFDM as claimed in claim 5; It is characterized in that the burst of
Figure 832342DEST_PATH_IMAGE009
satisfies following condition:
Figure 116693DEST_PATH_IMAGE014
。
8. the wireless signal treatment system based on COFDM as claimed in claim 5; It is characterized in that the burst of
Figure 466903DEST_PATH_IMAGE011
satisfies following condition:
。
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CN110519201A (en) * 2019-09-30 2019-11-29 中国传媒大学 A kind of signal peak-to-average ratio suppressing method based on OFDM transmitter system
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102769595A (en) * 2012-07-16 2012-11-07 清华大学 Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram
CN102769595B (en) * 2012-07-16 2015-05-20 清华大学 Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram
WO2014194697A1 (en) * 2013-06-08 2014-12-11 华为技术有限公司 Method for suppressing ofdm signal peak power in wireless communication system and transmitter
CN104243379A (en) * 2013-06-08 2014-12-24 华为技术有限公司 Method for restraining OFDM signal peak power in wireless communication system, and transmitter thereof
CN104468455A (en) * 2014-12-29 2015-03-25 西安电子科技大学 LTE system OFDM signal peak-to-average ratio suppression method combining constellation expansion with tone reservation
CN104468455B (en) * 2014-12-29 2018-02-09 西安电子科技大学 The LTE system ofdm signal method for suppressing peak to average ratio of joint constellation extension and preserved sub-carrier
CN105553909A (en) * 2015-12-08 2016-05-04 北京遥测技术研究所 Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals
CN105553909B (en) * 2015-12-08 2019-05-24 北京遥测技术研究所 A kind of method that iteration limit filtration reduces ofdm signal peak-to-average force ratio
CN109088843A (en) * 2018-10-22 2018-12-25 中国传媒大学 A kind of method for suppressing peak to average ratio based on the optimal distribution of ofdm signal amplitude
CN109088843B (en) * 2018-10-22 2021-01-15 中国传媒大学 Peak-to-average power ratio suppression method based on optimal amplitude distribution of OFDM (orthogonal frequency division multiplexing) signals
CN110519201A (en) * 2019-09-30 2019-11-29 中国传媒大学 A kind of signal peak-to-average ratio suppressing method based on OFDM transmitter system
CN112230212A (en) * 2020-09-28 2021-01-15 北京环境特性研究所 Radar ranging signal processing method and device

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