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Science China(Information Sciences) 2021年第11期64卷 207-215页

作者： Wenbo GUO Yimin HE Hongzhi ZHAO Shihai SHAO Youxi TANG National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

For the security of wireless communications, cooperative jamming can be used to intentionally degrade the signal-to-noise ratios received by eavesdroppers. Unfortunately, this jamming may also propagate to the legal receiver and then become a harmful self-interference(SI), which should be cancelled for reliable detection of the desired signal. In this paper, by comprehensively considering nonideal time-frequency alignment and channel equalization, SI-cancellation capability is investigated for the additive white Gaussian noise channel. Theoretical and simulation results demonstrated that the impact of the frequency alignment error is more serious than that of the time alignment and channel equalization errors. Moreover, it is illustrated that weaker SI power can tolerate a larger range of those nonidealities.

关键词： cooperative jamming self-interference time-frequency alignment channel equalization nonidealities.

A physical layer security scheme for full-duplex communication systems with residual self-interference and non-eavesdropping CSI

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Digital Communications and Networks 2021年第3期7卷 352-361页

作者： Weijia Lei Yang Zhou Xiuzhen Lin School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China

We discuss the physical layer security scheme in the Full-Duplex(FD)MIMO point-to-point two-way communication system with residual self-interference,in which legitimate nodes send confidential information and null space Artificial Noise(AN)while receiving information.Because the Channel State Information(CSI)of the eavesdropper is unavailable,we optimize the covariance matrices of the information signal as well as the allocation of the antenna for transmitting and receiving to minimize the signal power consumption under the target rate constraint.As a result,the power of AN is maximized within the limit of total power,so the interception capability of the eavesdropper is suppressed as much as possible.Since self-interference cannot be completely eliminated,the optimization process of one legitimate node depends on the optimization result of the other.By substituting self-interference power in the secrecy rate formula with its average value,the joint optimization process at the two nodes is transformed into two separate and solvable optimization processes.Then,the Water-Filling Algorithm(WFA)and bisection algorithm are used to get the optimal covariance matrices of the signal.Furthermore,we derive the theoretical lower bound of ergodic achievable secrecy rate under rayleigh channels to evaluate the performance of the scheme.The simulation results show that the theoretical derivation is correct,and the actual achievable rate is very close to the target rate,which means that the approximation in the optimization is feasible.The results also show that secrecy transmission can be realized because a considerable secrecy rate can be achieved.

关键词： Physical layer security Full-duplex self-interference Eavesdropping CSI Multi-antenna

self-interference Elimination by Physical Feedback Channel in CCFD for 3-D Beamforming Communication

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China Communications 2017年第9期14卷 62-71页

作者： Naveed Ali Kaimkhani Zhe Chen Fuliang Yin School of Information and Communication Engineering Dalian University of Technology

The 3-D beamforming scheme has elite as evolving interest because of its efficiency to empower assorted techniques such as vertical and horizontal domains and emanation beamforming according to subscriber's provisions. Usually, 3-D beamforming communication is set up on FDD/TDD approach those effects on the performance of spectrum and energy efficiency. Co-frequency and CoTime Full Duplex(CCFD) is an effective solution to improve the spectrum and energy efficiency by transmitting and receiving simultaneously in frequency and time domain. While, CCFD communication often face the self-interference issue when communication occurs, simultaneously. Consequently, in this paper a self-interference elimination by physical feedback channel in CCFD for 3-D Beamforming communication scheme is proposed to improve the over-all system performance in terms of energy and spectrum efficiency. The simulation and analytical outcomes demonstrated that the proposed system is superior than the traditional one.

关键词： spectrum efficiency energy effi-ciency co-frequency and co-time full duplex self-interference suppression 3-D beamform-ing

Iterative Phase Noise Suppression for Full-Duplex Communication Systems

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China Communications 2023年第2期20卷 226-234页

作者： Pengxin Guan Yiru Wang Hongkang Yu Yuping Zhao School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China Wireless Product Research and Development Institute ZTE CorporationShenzhen 518057China

Oscillator phase noise is one of the bottlenecks that limits the self-interference(SI)cancellation capability of full-duplex systems.In this paper,we propose a method for the suppression of common phase error(CPE)and intercarrier interference(ICI)induced by the phase noise in full-duplex orthogonal frequency division multiplexing(OFDM)systems.First,we regard the effect of CPE as a portion of the SI channel and perform estimation,reconstruction and elimination in the time domain.Then,the ICI signal is estimated and suppressed in the frequency domain.Additionally,by analysing the performance of proposed algorithm,we further develop an iterative mechanism to reduce the parameter estimation error and improve SI cancellation capability.Simulation results show that the proposed method has a significant SI cancellation capability improvement over the traditional SI cancellation schemes.

关键词： full-duplex self-interference phase noise suppression

CRISPR-mediated host genomic DNA damage is efficiently repaired through microhomology-mediated end joining in Zymomonas mobilis

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Journal of Genetics and Genomics 2021年第2期48卷 115-122页

作者： Xiaojie Wang Bo Wu Xin Sui Zhufeng Zhang Tao Liu Yingjun Li Guoquan Hu Mingxiong He Nan Peng State Key Laboratory of Agricultural Microbiology College of Life Science and TechnologyHuazhong Agricultural UniversityWuhanHubei 430070China Key Laboratory of Development and Application of Rural Renewable Energy(Ministry of Agriculture) Biomass Energy Technology Research CentreBiogas Institute of Ministry of AgricultureChengduSichuan 610041China

CRISPR-Cas systems provide bacteria and archaea with adaptive immunity against mobile genetic elements(MGEs)through uptake of invader-derived spacers.De novo adaptation samples spacers from both invaders and hosts,whereas primed adaptation shows higher specificity to sample spacers from invaders in many model systems as well as in the subtype I-F system of Zymomonas mobilis.self-derived spacers will lead to CRISPR self-interference.However,our in vivo study demonstrated that this species used the microhomology-mediated end joining(MMEJ)pathway to efficiently repair subtype I-F CRISPR-Cas system-mediated DNA breaks guided by the self-targeting spacers.MMEJ repair of DNA breaks requires direct microhomologous sequences flanking the protospacers and leads to DNA deletions covering the protospacers.Importantly,CRISPR-mediated genomic DNA breaks failed to be repaired via MMEJ pathway in presence of higher copies of short homologous DNA.Moreover,CRISPR-cleaved exogenous plasmid DNA was failed to be repaired through MMEJ pathway,probably due to the inhibition of MMEJ by the presence of higher copies of the plasmid DNA in Z.mobilis.Our results infer that MMEJ pathway discriminates DNA damages between in the host chromosome versus mobile genetic element(MGE)DNA,and maintains genome stability post CRISPR immunity in Z.mobilis.

关键词： CRISPR-Cas CRISPR adaptation self-interference Microhomology-mediated end joining Zymomonas mobilis

Secure Power and Subcarrier Auction in Uplink FullDuplex Cellular Networks

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China Communications 2015年第S1期12卷 157-165页

作者： LI Mingliang GUO Yunfei HUANG Kaizhi GUO Fei National Digital Switching System Engineering & Technological R&D Center

We consider a cellular network with a full-duplex base station, multiple uplink users and an eavesdropper. The full-duplex base station transmits jamming signals to degrade the eavesdropper channel when receiving secure multi-user signals. To maximize the secrecy rate of uplink communications, we propose a distributed ascending-clock auction(ACA) algorithm to allocate subcarriers and jamming power. Specifically, the impact of the self-interference of the full-duplex base station on the secrecy rate is considered. The proposed algorithm consists of two parts. Firstly, subcarriers and the jamming power are respectively priced by the base station. Secondly, users select the subcarrier and the jamming power based on the price. Moreover, the convergence of the proposed auction algorithm is mathematically proved. Simulation results show that the proposed auction algorithm is more beneficial to improve the uplink secrecy performance compared to traditional auction algorithms.

关键词： uplink auction physical layer security full-duplex self-interference

High-Performance Beamformer and Low-Complexity Detector for DF-Based Full-Duplex MIMO Relaying Networks

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China Communications 2017年第2期14卷 173-182页

作者： Feng Shu Ye Zhou Riqing Chen Jin Wang Jun Li Branka Vucetic College of Computer and Information Sciences Fujian Agriculture and Forestry University Fuzhou 350002 China School of Mobile Network Nanjing Technology University Pujiang Institute Nanjing 21134 China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing 210094 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China School of Electrical and Information Engineering the University of Sydney NSW Australia

In this paper, we consider a full.duplex multiple.input multiple.output(MIMO) relaying network with the decode.***.forward(DF) protocol. Due to the full.duplex transmissions, the self.interference from the relay transmitter to the relay receiver degrades the system performance. We thus propose an iterative beamforming structure(IBS) to mitigate the self.interference. In this method, the receive beamforming at the relay is optimized to maximize the signal.***.interference.***.noise.ratio(Max.SINR), while the transmit beamforming at the relay is optimized to maximize the signal.***.leakage.***.ratio(Max.SLNR). To further improve the performance, the receive and transmit beamforming matrices are optimized between Max.SINR and Max.SLNR in an iterative manner. Furthermore, in the presence of the residual self.interference, a low.complexity whitening.filter(WF) maximum likelihood(ML) detector is proposed. In this detector, a WF is designed to transform a colored interference.***.noise to a white noise, while the singular value decomposition is used to convert coupled spatial subchannels to parallelindependent ones. From simulations, we find that the proposed IBS performs much better than the existing schemes. Also, the proposed low.complexity detector significantly reduces the complexity of the conventional ML(CML) detector from exponential time(an exponential function of the number of the source transmit antennas) to polynomial one while achieving a slightly better BER performance than the CML due to interference whitening.

关键词： decoding-and-forward MIMO relay full-duplex self-interference iterative beamforming

Quality-of-service driven power allocations for wireless full-duplex bidirectional links

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Science China(Information Sciences) 2014年第4期57卷 168-177页

作者： CHENG WenChi ZHANG HaiLin State Key Laboratory of Integrated Services Networks Xidian University

Wireless full-duplex transmission has the potential to double the system throughput compared with the conventional half-duplex transmission.To achieve the maximum potential system throughput,optimal power allocation taking into account quality-of-service(QoS)is urgently needed.In this paper,we propose the QoS driven power allocation schemes for wireless full-duplex bidirectional links.By integrating information theory with the statistical QoS principle,we build two models–local transmit power related self-interference(LTPRS)model and local transmit power unrelated self-interference(LTPUS)model to analyze the wireless full-duplex transmission.For both of these two models,we derive the optimal power allocation schemes,which aim at maximizing the system throughput subject to the given delay-QoS constraint,over wireless bidirectional links with full-duplex transmission.The analyses and numerical results verify that our proposed power allocation scheme can efficiently support diverse QoS requirements over wireless bidirectional links.Our proposed fullduplex QoS driven power allocation schemes can obtain larger effective capacity compared with the conventional half-duplex transmission over wireless bidirectional links.

关键词： full-duplex quality-of-service(QoS) power allocation self-interference wireless bidirectional links convex optimization