CN109586759B - A kind of novel full duplex symbiosis communication system - Google Patents

A kind of novel full duplex symbiosis communication system Download PDF

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CN109586759B
CN109586759B CN201811524478.9A CN201811524478A CN109586759B CN 109586759 B CN109586759 B CN 109586759B CN 201811524478 A CN201811524478 A CN 201811524478A CN 109586759 B CN109586759 B CN 109586759B
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things
reflecting device
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signal
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CN109586759A (en
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梁应敞
龙睿哲
郭化盐
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University of Electronic Science and Technology of China
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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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H04B7/0897—Space-time diversity using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention belongs to wireless communication technology fields, are related to a kind of novel full duplex symbiosis communication system.The present invention proposes a kind of communication system architecture for blending full duplex passive type internet of things equipment and symbiosis wireless communication system, pass through the framework, Internet of Things reflecting device is received by full duplex technology come the broadcast singal of autonomous transmitter, and spectrum utilization efficiency is greatly improved；Main transmitter advanced optimizes the symbiosis communication system by beamforming design；Scheme implement it is simple, and it is provable be able to achieve the spectrum efficiency for being higher than and distributing dedicated communication resource for respective system, there is very strong application value.

Description

A kind of novel full duplex symbiosis communication system
Technical field
The invention belongs to wireless communication technology fields, are related to a kind of novel full duplex symbiosis communication system.
Background technique
Internet of Things is the important component of generation information technology, however, the development of technology of Internet of things has two big bottlenecks: One is low-power consumption constrain, i.e., internet of things equipment expects to have longer battery, and frequently replace battery will bring it is huge The maintenance costs of volume；The second is spectral constraints, i.e., existing frequency spectrum resource is much unable to satisfy the communication of magnanimity internet of things equipment Demand.
In recent years, passive communication construction gradually rises, and the communication construction is by radio frequency source, reflecting device (nothing Source transmitter) and reader (receiver) composition.Radio frequency source sends non-modulated carrier wave, supports one or more reflecting devices With the communication of receiver.Reflecting device does not include active device, changes the width of reflection signal only by adusting its antenna impedance Degree and phase are realized and are transmitted to the information of reader.
Passive type communication construction does not include the active device of high energy consumption due to its reflecting device, can effectively meet Internet of Things Demand of the net equipment to low energy consumption, therefore have become one of the core technology for supporting the following Internet of Things Network Communication.However, to realize The Internet of Things Network Communication in " any time, any place " needs, and needs to dispose radio frequency source on a large scale, thus there are higher bases The input cost of construction, this seriously constrains passive type communication construction and moves towards practical.How internet of things equipment energy need are being met When seeking common ground, and it is able to achieve higher spectrum efficiency, while can be reduced as far as possible using existing communication network infrastructure additional Expense becomes Internet of Things Network Communication needs and primarily solves the problems, such as.
Full-duplex communication technology refers to that device end can be in same frequency range, same time slot in communication system, while carrying out letter The reception and transmission of breath.Compared to traditional half-duplex system, full-duplex communication technology can greatly improve communication spectrum resource Utilization efficiency, further improve communication quality.The technology is combined with Internet of Things Network Communication, can greatly improve Internet of Things frequency spectrum benefit With efficiency and equipment access capacity.
Summary of the invention
The present invention proposes a kind of passive type Internet of Things based on full-duplex communication technology and Proactive communication system (hereinafter referred to as Main system) the symbiosis communication system architecture that blends, and transmitter beamforming design solution is provided.
The technical solution adopted by the present invention are as follows:
The present invention will realize the full-duplex communication of low-power consumption using backscattering and self-interference technology for eliminating.Internet of Things reflection Equipment can be matched by the impedance part of antenna end to be realized to the progress reflection modulation transmission of a part of incoming signal, meanwhile, it is right The information of another part incoming signal carries out reception demodulation.Specifically, microprocessor control impedance selection comes in reflecting device Change reflection coefficient, realizes reflection modulation；On the other hand, portions incident signal is entered inside circuit by antenna, can be used for letter Breath receives and demodulation.After microprocessor provides self-interference signal information, self-interference cancellation module, which can be eliminated, to be received in signal Self-interference ingredient, eventually by demodulation module realize information demodulation.It is as shown in Figure 1 that it implements block diagram.
The present invention combines the full duplex passive type Internet of Things communication technology with symbiosis wireless communication system.One multiple antennas master Transmitter utilizes beam forming technique, and same information is broadcast to main receiver and Internet of Things reflecting device.Meanwhile Internet of Things is anti- Jet device utilizes reflection modulation and full duplex technology to realize to the reception of broadcast singal and the transmission of own signal, i.e., on the one hand, Reflecting device is matched using antenna part, a part of broadcast singal is received, by signal demodulation module to broadcast singal It is demodulated；On the other hand, realize internet of things equipment to main receiver by reflection main system broadcast singal self information Information transmission.Main system receiver then needs to receive demodulation from main system transmitter and the signal of internet of things equipment.Cause This, which can be while main transmitter sends broadcast message, and the information for realizing internet of things equipment to main receiver is transmitted. The system comprises, main transmitter, the Internet of Things reflecting device with full duplex technology and receive the broadcast singal and anti- Penetrate the main receiver of signal.Its specific system model is as shown in Figure 2.
The present invention considers that, in main transmitter deployment M root antenna (M >=1), Internet of Things reflecting device disposes single antenna, receiver The case where disposing single antenna.It is assumed that it is the L times of (L that main transmitter sends symbol period that Internet of Things reflecting device, which sends symbol period, ≥1).Enabling reflecting device send signal in its nth symbol period is c (n), n=0,1 ..., N-1, and main transmitter sends letter Number be xt,l(n)=[xt,l,1(n),xt,l,2(n),...,xt,l,M(n)]T, l=0,1 ..., N-1, wherein xm,l(n) main hair is indicated Machine m root antenna is sent to send signal in moment l.In n-th of reflecting device symbol period, Internet of Things reflecting device is received First of signal yb,l(n) are as follows:
Wherein, β is the average power allocation coefficient due to absorption signal；Based on send out Send machine to the channel of reflecting device, specifically, h1,mIndicate that main transmitter m root (m=1,2 ..., M) antenna is set to reflection The channel of standby antenna；zb,lIt (n) is the reception noise of reflecting device.The Internet of Things reflecting device needs receiving broadcast singal Meanwhile it being transmitted by the information that backscatter technique realizes reflecting device to main receiver.
Meanwhile the reflection signal of Internet of Things reflecting device indicates are as follows:
WhereinExpression reflecting device transmission signal (Expression takes average operation).Internet of Things Reflecting device needs to design average power allocation factor beta and carrys out the energy that balanced signal is received with sent.
In n-th of reflecting device symbol period, first of signal y that main receiver receivesr,l(n) are as follows:
Wherein,For the channel of main transmitter to main receiver, specifically, h2,m Indicate main transmitter m root (m=1,2 ..., M) antenna to main receiver antenna channel；G indicates reflecting device to main reception The channel of machine；zr,lIt (n) is the reception noise of main receiver.Main receiver, which needs to cooperate with, demodulates the broadcast for carrying out autonomous system letter Number and the reflection signal from Internet of Things reflecting device.
In view of multi input communication system characteristic, it is total to advanced optimize this that transmitter also needs to carry out beamforming design Raw communication system information transmission.Transmitter signal has following expression
Wherein p is that main transmitter sends power, and v is the beamforming vectors of main system signal, sl(n) it indicates at the l moment The transmission symbol of main transmitter.Main transmitter, which needs to design above-mentioned coefficient, to be come so that above-mentioned cogeneration system best performance.
The Principle of Communication of foundation of the present invention are as follows: first, Internet of Things reflecting device can be disappeared using backscattering with self-interference Except realization full-duplex communication；It is passed secondly, main transmitter is realized by beam forming to reflecting device and main receiver broadcast singal While defeated, Internet of Things reflecting device is helped to realize that it is transmitted to the information of main receiver.
The invention has the benefit that the present invention propose it is a kind of by full duplex passive type internet of things equipment and symbiosis channel radio The communication system architecture that letter system blends, by the framework, Internet of Things reflecting device is received by full duplex technology come autonomous The broadcast singal of transmitter, greatly improves spectrum utilization efficiency；Main transmitter is advanced optimized by beamforming design The symbiosis communication system；Scheme is implemented simple, and provable is able to achieve the frequency for being higher than and distributing dedicated communication resource for respective system Spectrum efficiency has very strong application value.
Detailed description of the invention
Fig. 1 shows full duplex Internet of Things reflecting device design frame chart of the invention；
Fig. 2 shows system composition schematic diagrams of the invention；
Fig. 3 is present system figure compared with traditional time division half-duplex system power consumption.
Specific embodiment
The present invention will be described in detail with simulated example with reference to the accompanying drawing, so that those skilled in the art can be more Understand the present invention well.
By taking a multiple input single output passive type Internet of Things communicates cogeneration system with active transmission as an example.As shown in Fig. 2, main Transmitter (PT) has multiple antennas M (M > 1), and full duplex Internet of Things reflecting device (BD) and main receiver (PR) all only have list Root antenna.BD changes the amplitude-phase of environmental signal by changing its antenna reflection coefficient intentionally, oneself is needed to transmit Information c (n) is loaded in the broadcast singal s receivedl(n) on, the information transmission of BD to PR is realized, on the other hand, BD absorption removes Incoming signal except reflection carries out broadcast singal s after self-interference is eliminatedl(n) demodulation.
Consider flat block decline.In each decline block, with following symbolWithTo respectively indicate the channel fading coefficient of PT to BD and main chain path channels.The letter of BD to PR Road is a static channel, byTo indicate.Because this link can be complex as gh1。
Enable sl(n) broadcast singal of PT transmission, symbol period T are indicateds。sl(n) it is considered to obey zero-mean and variance For the signal of 1 Cyclic Symmetry multiple Gauss, i.e.,PT passes through beamforming vectorsCarry out transimission power For the signal of p.
Consider BD symbol period TcEqual to host signal symbols cycle TsScene, i.e. Tc=Ts, L=1.In such cases Omit sl(n) subscript l.
C (n) is that BD wants the information for being transferred to PR, information be there is different reflection coefficients to be determined, andConstant beta ∈ [0,1] is the average signal power distribution coefficient for controlling absorption signal and reflecting signal, by BD Reflection modulation generate reflection signal be
At the nth symbol period, signal y that BD is receivedb(n) it is expressed as follows:
Wherein zb(n) be zero-mean and variance isAdditive white Gaussian noise (AWGN).At this point, BD demodulates broadcast message The signal-to-noise ratio of s (n) are as follows:
Its achievable rate are as follows:
Rb,s=log2(1+γb,s) (7)
Meanwhile the reflection signal x of BDb(n) it is expressed as follows:
Therefore the signal received in PR indicates are as follows:
Wherein zr(n) be zero-mean and variance isAdditive white Gaussian noise (AWGN).For convenience, fixed at this time Adopted relative channel gainFor m=1 ..., M.
Since reflection link channel is to live through to decay twice, it is however generally that, main chain path channels h2It is to be better than time link Channel gh1.Therefore, PR can first demodulate broadcast singal s (n), then go to subtract main signal ingredient from the signal received again, most Demodulate c (n) eventually.Next, the system velocity system will be analyzed be likely to be breached.
Reflection signal is demodulated main signal s (n) as ambient noise first by PR, wherein the mean power of reflection signal isTherefore the Signal to Interference plus Noise Ratio (SINR) of PR demodulation s (n) is
In PR, broadcast singal s (n) achievable rate can be indicated are as follows:
Rr,s=log2(1+γr,s) (11)
By the above process, PR can obtain the estimated value that main signal arrivesThen PR using serial interference by being supported Technology disappear to demodulate c (n).
Assuming that broadcast singal ingredient can be removed completely, then in the case where known main signal s (n), demodulation reflection signal Signal-to-noise ratio (SNR) can be expressed as
Therefore, the achievable rate of reflection signal is in the case where given broadcast singal symbol s
Rr,c(|s|2)=log2(1+γ2,c(|s|2)) (13)
Therefore its average achievable rate indicates are as follows:
WhereinIt is the average SNR of c (n),Indicate exponential integral, F (x) is the exponential distribution probability density function of parameter θ=1.
Following transmitter can design its beamforming vectors v by solving the problems, such as following minimum transmission power optimization With the average power allocation factor beta of reflecting device.
s.t.Rr,s≥Rb,s,
Rb,s≥ηs, (15)
Rr,c≥ηc,
0≤β≤1,
||v||2=1.
Wherein, first is constrained to the adequate condition that PR implements serial link interference elimination；Second and third constraint point It Wei not the rate requirement of BD demodulation s (n) signal and the rate requirement of PR demodulation c (n) signal；4th constraint is for average reflection Power coefficient constraint；5th is constrained to beam forming normalization constraint.
In above-mentioned constraint condition, rate expression formula in case where c (n) is gaussian signal, but is not limited to it with s (n) His signal modulation mode, core are the rate constraint relationship of optimization problem.
In order to illustrate superiority of the system in spectrum efficiency and energy consumption, we introduce following typical time-division half-duplex Communication system is as a comparative reference.The reference system concrete composition is as follows:
At first time slot τ (0 < τ < 1), PT sends broadcast singal s (n) to BD and PR by beam forming, gulps down The amount of spitting requirement representation is Ls.Therefore its rate requirement is ηs=Ls/ τ, the power consumption P in the case of thishalf,1It can be by solving text Offer " Sidiropoulos N D, Davidson T N, Luo Z Q.Transmit beamforming for physical- layer multicasting[J].IEEE Transactions on Signal Processing,2006,54(6):2239- Optimization problem in 2251 " obtains；
At remaining time slots 1- τ, BD sends self information c (n) to PR by active transmission, and throughput demand is expressed as Lc.Therefore its rate requirement is ηc=Lc/ 1- τ, power consumption can be acquired by following equation in the case of this:
Therefore the half-duplex system power are as follows:
Phalf=Phalf,1+Phalf,2 (17)
Under throughput demands of the same race, the present invention proposes that the rate requirement of full duplex cogeneration system numerically has η respectivelys =LsAnd ηc=Lc。
Fig. 3 is compared under above-mentioned scene, gives throughput demand, the symbiosis with full duplex Internet of Things reflection communication equipment Wireless communication system is compared with the consumption power of traditional time division half-duplex system.Simulation parameter is set as transmitting antenna number M= 4, h1With h2In element obeyRelative channel gain △ Γ=- 20dB；The noise variance σ of receiver2=1, letter Realize that number is 1000 times in road.Even if can be seen that under the conditions of optimal time slot allocation, which disappears Consumption will also be lower than the half-duplex system based on time slot allocation.Therefore the full duplex cogeneration system can drop while saving frequency spectrum Low communication power consumption.

Claims (1)

1. a kind of novel full duplex symbiosis communication system, the full duplex symbiosis communication refers to, by full duplex passive type Internet of Things Network Communication is combined with symbiosis wireless communication system, which is characterized in that the full duplex symbiosis communication system include main transmitter, Full duplex Internet of Things reflecting device and main receiver；Main transmitter transmits a signal to full duplex Internet of Things reflecting device and master Receiver；The definition of full duplex Internet of Things reflecting device is that Internet of Things reflecting device can pass through the impedance part of antenna end Reflection modulation transmission is carried out to a part of incoming signal with realizing, meanwhile, the information of another part incoming signal is received Demodulation；The main receiver receives demodulation from main transmitter and the signal of full duplex internet of things equipment；Particularly:
It sets transmitter and disposes M root antenna, reflecting device disposes single antenna, and receiver disposes single antenna, concurrently sets Internet of Things Reflecting device sends L times for the period of symbol symbol period being sent for main transmitter, L >=1；Internet of Things reflecting device is at n-th Transmission signal on period is c (n), and the signal that main transmitter is sent is xt,l(n)=[xt,l,1(n),xt,l,2(n),...,xt,l,M (n)]T, wherein xm,l(n) it represents main transmitter m root antenna and sends signal in moment l；
The signal that main transmitter is sent indicates are as follows:
Wherein p is that main transmitter sends power, and v is the beamforming vectors of main system signal, sl(n) it indicates in the main transmission of l moment The transmission symbol of machine；
Main transmitter following minimum send power optimization and designs its beamforming vectors v and reflecting device by solving the problems, such as Average power allocation factor beta:
s.t.Rr,s≥Rb,s,
Rb,s≥ηs,
Rr,c≥ηc,
0≤β≤1,
||v||2=1.
Wherein, Rr,sAnd Rb,sRespectively indicate the rate of information throughput of the main transmitter to main receiver, Internet of Things reflecting device, Rr,c Indicate Internet of Things reflecting device to the main receiver rate of information throughput, ηsIt is passed for the information of main transmitter to Internet of Things reflecting device Defeated rate requirement, ηcFor the rate of information throughput requirement of Internet of Things reflecting device to main receiver, circular are as follows:
Rr,s=log2(1+γr,s)
Rb,s=log2(1+γb,s)
Wherein,Expression takes average operation, and e indicates that natural Exponents, Ei () indicate exponential integral function, and calculation method isγr,sAnd γb,sMain transmitter is respectively indicated to main receiver, the signal-to-noise ratio of Internet of Things reflecting device, It is the average signal-to-noise ratio of c (n),The respectively additive white Gaussian noise variance of main receiver and Internet of Things reflecting device；
In n-th of Internet of Things reflecting device symbol period, first of signal y that Internet of Things reflecting device receivesb,l(n) are as follows:
Wherein, β is the average power allocation coefficient due to absorption signal；For main transmitter To the channel of reflecting device, wherein h1,mIndicate main transmitter m root antenna to reflecting device antenna channel；zb,lIt (n) is anti- The reception noise of jet device；
The reflection signal of Internet of Things reflecting device are as follows:
In n-th of reflecting device symbol period, first of signal y that main receiver receivesr,l(n) are as follows:
Wherein,For the channel of main transmitter to main receiver, wherein h2,mIndicate main hair Send machine m root antenna to the channel of main receiver antenna；G indicates reflecting device to the channel of main receiver；zr,l(n) it is connect based on The reception noise of receipts machine.
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