CN109688082A - A kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization - Google Patents

A kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization Download PDF

Info

Publication number
CN109688082A
CN109688082A CN201910025384.5A CN201910025384A CN109688082A CN 109688082 A CN109688082 A CN 109688082A CN 201910025384 A CN201910025384 A CN 201910025384A CN 109688082 A CN109688082 A CN 109688082A
Authority
CN
China
Prior art keywords
signal
radar
radcom
ifft
frequency domain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201910025384.5A
Other languages
Chinese (zh)
Other versions
CN109688082B (en
Inventor
胡苏�
黄驿轩
马仕勇
唐万斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Electronic Science and Technology of China
Original Assignee
University of Electronic Science and Technology of China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Electronic Science and Technology of China filed Critical University of Electronic Science and Technology of China
Priority to CN201910025384.5A priority Critical patent/CN109688082B/en
Publication of CN109688082A publication Critical patent/CN109688082A/en
Application granted granted Critical
Publication of CN109688082B publication Critical patent/CN109688082B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Abstract

The invention belongs to fields of communication technology, are related to a kind of Radar-Communication Integrated system based on OFDM.This method is on the basis of traditional ofdm system, bit stream to be sent is modulated to data symbol first by transmitting terminal, then part is carried out according to data bandwidth ratio and retains Waveform Design using data symbol and with random phasic serial signal, obtain RadCom frequency-region signal, then time domain is mapped to by IFFT, is emitted in channel after addition CP (Cyclic Prefix) by radio-frequency front-end.It in receiving end, receives signal and frequency domain is mapped to by FFT after removing CP, carry out equilibrium to it to make up channel distortion, the signal after equilibrium is then extracted into symbol according to data bandwidth ratio, obtains bit information finally by symbol demodulation.Meanwhile transmitting terminal and the frequency-region signal of receiving end will be used for radar processing.The invention introducing portion retains round-robin algorithm, can be under the premise of keeping communication system intrinsic advantage, flexible bandwidth allocation, and effectively reduces PAPR, improves the availability of frequency spectrum.

Description

A kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization
Technical field
The invention belongs to fields of communication technology, are related to a kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization System.
Background technique
It is well known that wireless frequency spectrum is natural resources valuable in radio communication, generally by the way of fixed allocation, It is licensed by government bodies.Due to the rapid development of the communications industry, the poor problem of radio spectrum resources is got worse, so And there is no sufficiently used the frequency spectrum of most of frequency ranges.This has resulted in not appointed in some frequency band mosts of the time What user uses, and other frequency bands are then relatively very fierce using competing.In LTE technology, the bandwidth of OFDM waveform uses reachable To one times of 20MHz or several times.And in radar application, in order to guarantee detection accuracy, bandwidth can reach hundreds of million to thousands of million Hertz, minimum bandwidth 100MHz.In order to meet the reality of communication with radar application respectively while increasing the availability of frequency spectrum Border bandwidth demand can retain Waveform Design algorithm by part and organically combine the frequency band of former communication system and nearby frequency bands, reach To the purpose for increasing the availability of frequency spectrum and reduction overall waveform PAPR.
The core concept that part retains Waveform Design algorithm is that signal of communication is transmitted in communication band, and in adjacent frequency Overall waveform can reduce the PAPR of waveform by the frequency-domain waveform of transmission optimization in section after IFFT is mapped to time domain, and will Overall signal is used for radar detection, and existing communications band frequency range adjacent thereto is made full use of to realize Radar-Communication Integrated.
Summary of the invention
(Radar and Communication communicates thunder to the RadCom that the purpose of the present invention is to propose to a kind of based on OFDM Up to integration) flexible allocation bandwidth and the improvement RadCom system of PAPR can be effectively reduced in system.It is traditional based on OFDM RadCom system while having High Data Rate, there are also problems, as bandwidth usage does not meet actual demand and PAPR mistake It is high.In LTE technology, the bandwidth of OFDM waveform uses one times or the several times that can reach 20MHz.And in radar application, in order to protect Detection accuracy is demonstrate,proved, bandwidth can reach hundreds of million to multiple gigahertz, minimum bandwidth 100MHz.It is traditional based on OFDM's RadCom system is by whole section of frequency range while to be used for communications and radar detection, since the practical minimum bandwidth of radar is 100MHz, and communicate actual bandwidth and this bandwidth is not achieved, and the high PAPR problem of OFDM inherently will lead to efficiency power amplifier Lowly.The invention proposes the RadCom systems based on OFDM, under conditions of keeping communicating high data rate, by adjacent frequency The design for taking frequency domain optimization waveform achievees the purpose that flexible allocation frequency spectrum and reduces waveform PAPR.
The technical solution of the present invention is as follows:
If the t easet ofasubcarriers of OFDM are Ω, total number of sub-carriers N.ΩcIt is defined as the t easet ofasubcarriers that communication occupies, Nc For the number of sub carrier wave for communication.ΩrIt is defined as the t easet ofasubcarriers that optimization occupies, NrThe number of sub carrier wave occupied for it. ΩcWith ΩrIt is orthogonal: Ωc∪Ωr=Ω, Ωc∩Ωr=Φ, wherein Φ is empty set.Retain iterative algorithm based on part Frequency-region signal structure chart as shown in Figure 1,WithRespectively Vector and optimization vector are communicated, wherein ()TFor transposition oeprator.For the sub-carrier number of communication and the ratio of total sub-carrier number Example is defined as data bandwidth ratio, is w=Nc/N.Therefore frequency domain RadCom signal phasor is defined as X=C+D.
The OFDM RadCom system construction drawing for retaining iterative algorithm based on part is as shown in Figure 2.In this integrated programme In.Sending end structure schematic diagram is as shown in Fig. 2, data processing is as follows:
1) by user's bit stream information, pass through QAM (Quadrature Amplitude Modulation) or PAM (Phase Amplitude Modulation) it is modulated to data symbol, while generating random phasic serial signal.
2) according to the data bandwidth of setting ratio w, iterative algorithm is retained for data symbol and random phasic serial signal by part It is converted into frequency domain RadCom waveform.Part retains iterative algorithm, and specific step is as follows:
Step 1: enabling k=0, data symbol sequence C, calculation optimization Sequence Coefficient are determined according to data bandwidth ratio w
Utilize random phasic serial signalGenerate initial optimization sequenceWhereinTo be uniformly distributed in [0,2 Independent random variable π), n=Nc,Nc+1,...,N-1；
Step 2: starting+1 iteration of kth, by obtained D(k), X can be obtained(k)=C+D(k)；Calculate X(k)IFFT, obtain excellent Change phase
ψ(k)=arg [IFFT (X(k))], (2)
Wherein IFFT () is IFFT (Inverse Fast Fourier Transform) operation, and arg () is to take phase Bit arithmetic；
Step 3: utilizing ψ(k), time domain sequences x can be obtained:It defines z=FFT (x), Wherein FFT () is FFT (Fast Fourier Transform) operation, then updates optimization part
Step 4: repeating step 2 with step 3 until the following conditions are met
||D(k)-D(k+1)||2<10-3Or k > 100, (4)
Wherein D(k)For the optimization vector obtained after kth time iteration, and criterion k > 100 are used for the runing time of control algolithm. Finally, D=D(k+1), and X=C+D.
3) by obtained RadCom frequency domain signal X after serioparallel exchange (S/P), signal is used for radar processing all the way, Signal is mapped to time domain by IFFT all the way, it is clear that corresponding time domain RadCom signal phasor is x=IFFT (X)=IFFT (D+ C).By gained signal by CP being added, before the radio frequency including digital-to-analogue conversion (D/A) after parallel-serial conversion (P/S) End emits gained signal into channel, that is, completes transmitting terminal work.
The data handling procedure of receiving end is following (as shown in Figure 2):
1) arriving signal by channel effect is received first, after signal passes through analog-to-digital conversion (A/D), removal CP is mapped to frequency domain by FFT and obtains frequency domain reception RadCom signal then by S/PIt is classified as two Road is handled for radar all the way, and another way carries out channel equalization to compensate channel distortion.MMSE (Minimum can be used in equilibrium Mean-Squared Error) or ZF (Zero Forcing) balanced device, MMSE be respectively with ZF equalizing coefficient
Wherein, H [k] is the frequency domain representation of channel impulse response, εbWith N0Respectively signal energy per bit and AWGN The power spectral density of (Additive White Gaussian Noise).Signal after equilibrium be represented by frequency-region signal and The IFFT for the multiplication that weighs:
2) signal after equilibrium is extracted into the reception traffic symbols of corresponding position according to data bandwidth ratio w, so by P/S Bit stream is demodulated by corresponding QAM or PAM afterwards, i.e. the processing of completion communications reception.
The radar treatment process of RadCom system is as follows:
1) by NfThe corresponding RadCom frequency domain transmission signal of a OFDM frequency domain symbolWith RadCom frequency domain Receive signalMatrix form is lined up in such a way that each complete OFDM frequency domain symbol is a column respectively, Following matrix is obtained,
With
2) by MXMiddle promising 0 element becomes 1, carries out matrix element and is put correspondingly except operation, obtains quotient's matrix MD =MY/MX。
3) to quotient's matrix MDEach column carry out the IFFT operation of N point respectively, believed with the relevant speed of extraction environment target Breath, then N is carried out respectively to the every a line for the matrix that back obtainsfThe FFT operation of point, is believed with the distance of extraction environment target Breath.
4) three-dimensional radar display figure can be drawn by the absolute value of the element of matrix obtained in the previous step, utilizes pre-determined threshold height Degree can differentiate number, the information of distance and relevant speed of target, i.e. completion radar processing in three-dimensional radar display figure.
The basic OFDM symbol time is T, and the CP time is Tcp, then the complete OFDM symbol time is Tsym=T+Tcp, and son carries Wave spacing is Δ f=1/T.The detectable target maximum distance of the radar processing method used herein is rmax=Tc/2, maximum phase It is v to speedmax=c/ (2fcTsym), wherein c and fcThe respectively light velocity and carrier frequency, and the distance resolution of the method is c/ (2N Δ f), velocity resolution are c/ (2NffcTsym)。
Beneficial effects of the present invention:
The present invention is that the one kind proposed in RadCom system traditional based on OFDM is based on part and retains iterative algorithm Can flexible allocation frequency spectrum and reduce waveform PAPR improvement project.This method is the RadCom system traditional based on OFDM On the basis of, setting data bandwidth ratio w first, transmitting terminal is retained data symbol with random phasic serial signal according to w by part to change The frequency-domain waveform of low PAPR is generated for algorithm, and signal is mapped to simultaneously by time domain by the step identical as conventional OFDM systems later It is emitted in channel.The data demodulation of receiving end is the inverse operation of transmitting terminal, in addition to increasing frequency domain equalization after the fft.Thunder Up to processing then using frequency-region signal progress ARRAY PROCESSING is sended and received, the quantity of environmental goals, the letter of distance and speed are obtained Breath.Part, which retains iterative algorithm, can neatly be assigned as one section of bandwidth communication bandwidth and optimization bandwidth, be communicated by retaining Data, optimization overall waveform obtain low PAPR waveform, can make RadCom system not only while meet actual communication bandwidth requirements With radar bandwidth demand, and reduces the non-linear distortion in power amplifier and improve efficiency power amplifier.
Detailed description of the invention
Fig. 1 is the frequency-region signal structure chart for retaining iterative algorithm based on part.
Fig. 2 is the OFDM R for retaining iterative algorithm based on partadCoM system construction drawing.
Specific embodiment
Technical solution of the present invention is described in detail in Summary, details are not described herein.

Claims (2)

1. a kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization, if the t easet ofasubcarriers of OFDM are Ω, son Total number subcarriers are N；Define ΩcFor the t easet ofasubcarriers that communication occupies, NcFor the number of sub carrier wave for communication, ΩrIt is accounted for for optimization T easet ofasubcarriers, NrFor ΩrThe number of sub carrier wave of occupancy；ΩcWith ΩrIt is orthogonal: Ωc∪Ωr=Ω, Ωc∩Ωr= Φ, wherein Φ is empty set；Communication vector is defined simultaneouslyOptimize vectorWherein ()TFor transposition oeprator, sub-carrier number and total sub-carrier number for communication Ratio be defined as data bandwidth ratio, i.e. w=Nc/N；Frequency domain communication radar integral system RadCom signal phasor is defined as X =C+D；It is characterised by comprising:
Transmitting terminal
S1, by user's bit stream information, be modulated to data symbol, while generating random phasic serial signal；
S2, the data bandwidth ratio w according to setting retain iterative algorithm by part and convert data symbol and random phasic serial signal For frequency domain RadCom waveform, iterative algorithm is specially retained using part:
S21, k=0 is enabled, data symbol sequence C is determined according to data bandwidth ratio w, calculation optimization Sequence Coefficient:
Utilize random phasic serial signalGenerate initial optimization sequenceWhereinFor be uniformly distributed in [0,2 π) Independent random variable, n=Nc,Nc+1,...,N-1；
S22 ,+1 iteration of kth is carried out, by obtained D(k), X can be obtained(k)=C+D(k)；Calculate X(k)IFFT, obtain optimization phase Position:
ψ(k)=arg [IFFT (X(k))]
Wherein IFFT () is IFFT operation, and arg () is to take phase operation；
S23, ψ is utilized(k), obtain time domain sequences x:It defines z=FFT (x), then updates excellent Change part:
S24, step S22 and step S23 are repeated until the following conditions are met:
||D(k)-D(k+1)||2<10-3Or k > 100
Wherein D(k)For the optimization vector obtained after kth time iteration, criterion k > 100 are for controlling iteration time；Finally, D=D(k +1), and X=C+D.
S3, obtained RadCom frequency domain signal X is passed through into serioparallel exchange, signal is used for radar processing all the way, and signal passes through all the way It crosses IFFT and is mapped to time domain, i.e., corresponding time domain RadCom signal phasor is x=IFFT (X)=IFFT (D+C)；By gained signal After parallel-serial conversion, CP is added, is emitted as radio-frequency front-end signal by obtained by including digital-to-analogue conversion into channel, i.e., Complete transmitting terminal work；
Receiving end
S4, after passing through analog-to-digital conversion to reception signal, CP is removed, then leads to serioparallel exchange, frequency domain is mapped to by FFT and obtains frequency domain Receive RadCom signalBe classified as two-way, all the way for radar handle, another way carry out channel equalization with Compensate channel distortion；
S5, after the signal after equilibrium is passed through parallel-serial conversion, symbol is communicated according to the reception that data bandwidth ratio w extracts corresponding position Number, it is then demodulated into bit stream, i.e. the processing of completion communications reception.
2. a kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization according to claim 1, feature It is, radar treatment process described in step S4 are as follows:
S41, by NfThe corresponding RadCom frequency domain transmission signal of a OFDM frequency domain symbolIt is received with RadCom frequency domain SignalRespectively by each complete OFDM frequency domain symbol be one column in the way of line up matrix form to get To following matrix,
With
S42, by MXMiddle promising 0 element becomes 1, carries out matrix element and is put correspondingly except operation, obtains quotient's matrix MD= MY/MX；
S43, to quotient's matrix MDEach column carry out the IFFT operation of N point respectively, with the relevant speed information of extraction environment target, Every a line of the matrix obtained again to back carries out N respectivelyfThe FFT operation of point, with the range information of extraction environment target；
S44, three-dimensional radar display figure is drawn by the absolute value of the element of matrix obtained in the previous step, existed using pre-determined threshold height Three-dimensional radar shows number, the information of distance and relevant speed that target is differentiated in figure, the i.e. processing of completion radar.
CN201910025384.5A 2019-01-11 2019-01-11 Communication radar integrated system based on OFDM carrier joint optimization Active CN109688082B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910025384.5A CN109688082B (en) 2019-01-11 2019-01-11 Communication radar integrated system based on OFDM carrier joint optimization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910025384.5A CN109688082B (en) 2019-01-11 2019-01-11 Communication radar integrated system based on OFDM carrier joint optimization

Publications (2)

Publication Number Publication Date
CN109688082A true CN109688082A (en) 2019-04-26
CN109688082B CN109688082B (en) 2021-02-12

Family

ID=66193030

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910025384.5A Active CN109688082B (en) 2019-01-11 2019-01-11 Communication radar integrated system based on OFDM carrier joint optimization

Country Status (1)

Country Link
CN (1) CN109688082B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110736977A (en) * 2019-10-25 2020-01-31 海鹰企业集团有限责任公司 integration signal generation method suitable for sonar detection
CN111060876A (en) * 2019-12-11 2020-04-24 四川九洲空管科技有限责任公司 Method for realizing radar communication data link
CN113347132A (en) * 2021-05-25 2021-09-03 西安空间无线电技术研究所 TDS-OFDM-based radar communication integrated signal determination and transmission method
CN113364718A (en) * 2021-05-24 2021-09-07 北京邮电大学 Perception communication integration system based on 5G NR
CN113612716A (en) * 2021-08-09 2021-11-05 电子科技大学 Multi-user communication radar integrated system based on constant envelope orthogonal frequency division multiplexing
CN115442197A (en) * 2022-08-30 2022-12-06 西安电子科技大学 Integrated signal design and processing method adopting OFDM without cyclic prefix

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608578A (en) * 2011-01-21 2012-07-25 中国科学院空间科学与应用研究中心 Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing
CN106230573A (en) * 2016-08-31 2016-12-14 电子科技大学 A kind of TDCS multiple access based on sequential design accesses improved method
CN106353749A (en) * 2016-08-31 2017-01-25 电子科技大学 Super-resolution TDCSRAD (Transform Domain Communication System Radar) and communication integrated design method
CN107490785A (en) * 2017-09-19 2017-12-19 电子科技大学 A kind of OFDM radar-communication integration waveform design methods based on frequency domain zero setting modulation
US20180026823A1 (en) * 2016-07-22 2018-01-25 Rajendra Kumar High capacity orthogonal frequency division multiple accessing systems and methods
CN108512797A (en) * 2018-03-21 2018-09-07 电子科技大学 A kind of radar-communication integration Design of Signal method based on orthogonal frequency division multiplexing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608578A (en) * 2011-01-21 2012-07-25 中国科学院空间科学与应用研究中心 Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing
US20180026823A1 (en) * 2016-07-22 2018-01-25 Rajendra Kumar High capacity orthogonal frequency division multiple accessing systems and methods
CN106230573A (en) * 2016-08-31 2016-12-14 电子科技大学 A kind of TDCS multiple access based on sequential design accesses improved method
CN106353749A (en) * 2016-08-31 2017-01-25 电子科技大学 Super-resolution TDCSRAD (Transform Domain Communication System Radar) and communication integrated design method
CN107490785A (en) * 2017-09-19 2017-12-19 电子科技大学 A kind of OFDM radar-communication integration waveform design methods based on frequency domain zero setting modulation
CN108512797A (en) * 2018-03-21 2018-09-07 电子科技大学 A kind of radar-communication integration Design of Signal method based on orthogonal frequency division multiplexing

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
YIXUAN HUANG等: "NC-OFDM RadCom system for electromagnetic spectrum interference", 《2017 IEEE 17TH INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY (ICCT)》 *
赵国锋等: "5G移动通信网络关键技术综述", 《重庆邮电大学学报(自然科学版)》 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110736977A (en) * 2019-10-25 2020-01-31 海鹰企业集团有限责任公司 integration signal generation method suitable for sonar detection
CN111060876A (en) * 2019-12-11 2020-04-24 四川九洲空管科技有限责任公司 Method for realizing radar communication data link
CN113364718A (en) * 2021-05-24 2021-09-07 北京邮电大学 Perception communication integration system based on 5G NR
CN113364718B (en) * 2021-05-24 2022-02-25 北京邮电大学 Perception communication integration system based on 5G NR
WO2022246998A1 (en) * 2021-05-24 2022-12-01 北京邮电大学 Sensing and communication integrated system based on mobile communication signal
CN113347132A (en) * 2021-05-25 2021-09-03 西安空间无线电技术研究所 TDS-OFDM-based radar communication integrated signal determination and transmission method
CN113612716A (en) * 2021-08-09 2021-11-05 电子科技大学 Multi-user communication radar integrated system based on constant envelope orthogonal frequency division multiplexing
CN113612716B (en) * 2021-08-09 2022-06-07 电子科技大学 Multi-user communication radar integrated system based on constant envelope orthogonal frequency division multiplexing
CN115442197A (en) * 2022-08-30 2022-12-06 西安电子科技大学 Integrated signal design and processing method adopting OFDM without cyclic prefix
CN115442197B (en) * 2022-08-30 2024-02-27 西安电子科技大学 Integrated signal design and processing method adopting cyclic prefix-free OFDM (orthogonal frequency division multiplexing)

Also Published As

Publication number Publication date
CN109688082B (en) 2021-02-12

Similar Documents

Publication Publication Date Title
CN109688082A (en) A kind of Radar-Communication Integrated system based on OFDM carrier wave combined optimization
CN103560986B (en) Visible light communication system based on MIMO-OFDM modulation and channel estimation methods
CN112532351B (en) Interleaving transmission method for weighted fractional Fourier transform frequency domain two-component signal
CN102904854A (en) Method and device for reducing peak-to-average power ratio in filter-bank multi-carrier system
GB2434725A (en) PAPR minimisation in OFDM by allocating the same information to two groups of sub-carriers and transposing the information in one of the groups
CN112532350B (en) Interleaving transmission method for weighted fractional Fourier transform time domain two-component signal
Valluri et al. A new selective mapping scheme for visible light systems
CN102769599B (en) A kind of novel signal of orthogonal frequency division multiplexing system processing method and device
CN113612716B (en) Multi-user communication radar integrated system based on constant envelope orthogonal frequency division multiplexing
CN104917712B (en) Signal processing method and device
CN105141563A (en) Space frequency combined modulation design scheme used for MIMO-OFDM system
CN106888178A (en) A kind of OFDM/OQAM system channel estimation methods
US8934556B2 (en) System and method for communicating with shaped cyclic time-domain waveforms
CN103281265A (en) Pilot sequence structure in MIMO-OFDM/OQAM (Multi-input Multi-output-Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Modulation) system and channel estimation method
CN107995139A (en) A kind of Orthogonal Frequency Division Multiplexing index modulation transmission method of efficient, high-performance and low complex degree
Kadir et al. Entropy coding aided adaptive subcarrier-index modulated OFDM
Shi et al. A partial transmit sequences based approach for the reduction of peak-to-average power ratio in FBMC system
US20240106685A1 (en) Multiple-access constant envelope orthogonal frequency division multiplexing method and system
CN109067686A (en) Method for transmitting signals based on binary phase shift keying modulation and orthogonal frequency division multiplexi
Patel et al. A comparative performance analysis of OFDM using MATLAB simulation with M-PSK and M-QAM mapping
CN105991507A (en) Data transmission method, data demodulation method, device and system
CN104717173B (en) Sub-carriers complex balancing wireless communication method based on channel decoupling
Ankita et al. Review of various PTS (Partial Transmit Sequence) techniques of PAPR (Peak to Average Power Ratio) reduction in MIMO-OFDM
Ahmad et al. 2022 4th International Conference on Advances in Computing, Communication Control and Networking (ICAC3N)
Chen et al. OTFS Waveform Based on 3-D Signal Constellation for Time-Variant Channels

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant