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On the Performance of Active Analog Self-Interference Cancellation Techniques for Beyond 5G Systems 被引量:3
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作者 Haifeng Luo Mark Holm Tharmalingam Ratnarajah 《China Communications》 SCIE CSCD 2021年第10期158-168,共11页
The in-band full-duplex(IBFD)mechanism is of interest in beyond 5 G systems due to its potential to enhance spectral efficiency and reduce delay.To achieve the maximum gain of IBFD systems,the significant self-interfe... The in-band full-duplex(IBFD)mechanism is of interest in beyond 5 G systems due to its potential to enhance spectral efficiency and reduce delay.To achieve the maximum gain of IBFD systems,the significant self-interference(SI)must be efficiently suppressed.The challenges of wideband selfinterference cancellation(SIC)lie in the radio frequency(RF)domain,where the performance will be limited by the hardware.This paper reviews current RF cancellation mechanisms and investigates an efficient mechanism for future wideband systems with minimum complexity.The working principle and implementation details of multi-tap cancellers are first introduced,then an optical domain-based RF canceller is reviewed,and a novel low-cost design is proposed.To minimize the cost and complexity of the canceller,the minimum required number of taps are analyzed.Simulation results show that with the commonly used 12-bits analog-to-digital converter(ADC)at the receiver,the novel optical domain-based canceller can enable efficient SIC in the 3 GPP LTE specifications compatible system within 400 MHz bandwidth. 展开更多
关键词 full-duplex beyond 5G system self-interference cancellation optical domain-based canceller
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Adaptive digital self-interference cancellation based on fractional order LMS in LFMCW radar 被引量:6
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作者 LUO Yongjiang BI Luhao ZHAO Dong 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2021年第3期573-583,共11页
Adaptive digital self-interference cancellation(ADSIC)is a significant method to suppress self-interference and improve the performance of the linear frequency modulated continuous wave(LFMCW)radar.Due to efficient im... Adaptive digital self-interference cancellation(ADSIC)is a significant method to suppress self-interference and improve the performance of the linear frequency modulated continuous wave(LFMCW)radar.Due to efficient implementation structure,the conventional method based on least mean square(LMS)is widely used,but its performance is not sufficient for LFMCW radar.To achieve a better self-interference cancellation(SIC)result and more optimal radar performance,we present an ADSIC method based on fractional order LMS(FOLMS),which utilizes the multi-path cancellation structure and adaptively updates the weight coefficients of the cancellation system.First,we derive the iterative expression of the weight coefficients by using the fractional order derivative and short-term memory principle.Then,to solve the problem that it is difficult to select the parameters of the proposed method due to the non-stationary characteristics of radar transmitted signals,we construct the performance evaluation model of LFMCW radar,and analyze the relationship between the mean square deviation and the parameters of FOLMS.Finally,the theoretical analysis and simulation results show that the proposed method has a better SIC performance than the conventional methods. 展开更多
关键词 adaptive digital self-interference cancellation(ADsiC) linear frequency modulated continuous wave(LFMCW)radar fractional order least mean square(LMS)
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Polarization Oblique Projection Based Self-Interference Cancellation against PA Nonlinear Distortion in MIMO Full Duplex System 被引量:1
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作者 Wen Zhao Chunyan Feng +1 位作者 Fangfang Liu Caili Guo 《China Communications》 SCIE CSCD 2016年第11期49-59,共11页
In MIMO full duplex system,power amplifier(PA) nonlinearity limits the self-interference(SI) cancellation seriously. Most existing methods need to model and estimate the PA nonlinearity in order to reconstruct the SI,... In MIMO full duplex system,power amplifier(PA) nonlinearity limits the self-interference(SI) cancellation seriously. Most existing methods need to model and estimate the PA nonlinearity in order to reconstruct the SI,however the estimation error caused by the mismatch between the estimated PA model and the actual PA property still impacts the cancellation ability,especially when the transmit power is high. In this paper we propose a polarization oblique projection based self-interference cancellation method which does not need to estimate the PA nonlinearity coefficients. It exploits the polarization state information of the signals which is immune to the PA nonlinearity,and establishes an oblique projection operator to cancel the SI. Numerical results and analysis demonstrate that it can cancel the nonlinear SI effectively. Moreover the signal to interfere plus noise ratio(SINR) and the achievable sum rate do not deteriorate when the transmit power is high. Further,the upper bound of the achievable sum rate can be more than twice that of the half duplex. 展开更多
关键词 full duplex self-interference cancellation PA nonlinearity polarization oblique projection
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All-Digital Self-Interference Cancellation in Zero-IF Full-Duplex Transceivers 被引量:4
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作者 Lu Tian Shuai Wang +1 位作者 Zhiheng Cheng Xiangyuan Bu 《China Communications》 SCIE CSCD 2016年第11期27-34,共8页
In this paper,a general scheme in digital self-interference cancellation at baseband for zero-IF full-duplex transceivers is presented. We model the self-interference signals specifically with only the nonlinear disto... In this paper,a general scheme in digital self-interference cancellation at baseband for zero-IF full-duplex transceivers is presented. We model the self-interference signals specifically with only the nonlinear distortion signals falling in receiving band considered. A joint estimation algorithm is proposed for compensating the time delay and frequency offset taking into account the IQ amplitude and phase imbalances from mixers. The memory effect and nonlinear distortion are adaptively estimated by the de-correlated normalized least mean square(DNLMS) algorithm. Numerical simulation results demonstrate that the proposed self-interference cancellation scheme can efficiently compensate the self-interference and outperform the existing traditional solutions. 展开更多
关键词 communication systems full-duplex transceivers self-interference cancellation IQ imbalance de-correlated normalized least mean square algorithm
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Full-duplex prototype based on joint passive and digital cancellation method
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作者 Di Wu Can Zhang +1 位作者 Shaoshuai Gao Heping Zhao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第4期694-704,共11页
Recent research shows that it is possible to achieve the full-duplex system by cancelling strong self-interference signals, which can be divided into three classes respectively, i.e., passive cancellation, active canc... Recent research shows that it is possible to achieve the full-duplex system by cancelling strong self-interference signals, which can be divided into three classes respectively, i.e., passive cancellation, active cancellation and digital cancellation. This pa- per tries to achieve the full-duplex system without using active cancellation, thus a full-duplex system using a joint mechanism based on a novel passive cancellation method and a novel digital cancellation method is proposed. Therein, a good antenna place- ment guided by the theory of the antenna electromagnetic field for the passive cancellation is presented. For the proposed digital can- cellation method, unlike previous separate mechanisms, it is de- signed by using the recursive least square (RLS) algorithm jointly with passive cancellation. The self-interference channel state in- formation (CSI) is transferred as the input of digital cancellation to balance the performance and the complexity. Experimental results show that the proposed self-interference cancellation mechanism can achieve about 85 dB which is better than the previous re- search. Meanwhile, this design provides a better performance compared with half-duplex with both line-of-sight channel and non- line-of-sight channel. 展开更多
关键词 full-duplex self-interference cancellation joint passiveand digital mechanism.
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RF self-interference cancellation by using photonic technology [Invited] 被引量:4
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作者 Xiuyou Han Xinxin Su +4 位作者 Shuanglin Fu Yiying Gu Zhenlin Wu Xiaozhou Li Mingshan Zhao 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第7期116-125,共10页
Radio frequency(RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications.Compared with electronic technology, photoni... Radio frequency(RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications.Compared with electronic technology, photonic technology has the advantages of wide bandwidth and high tuning precision, exhibiting great potential to realize high interference cancellation depth over broad band.In this paper, a comprehensive overview of photonic enabled RF self-interference cancellation(SIC)is presented.The operation principle of photonic RF SIC is introduced, and the advances in implementing photonic RF SIC according to the realization mechanism of phase reversal are summarized.For further realistic applications, the multipath RF SIC and the integrated photonic RF SIC are also surveyed.Finally, the challenges and opportunities of photonic RF SIC technology are discussed. 展开更多
关键词 in-band full-duplex radio frequency self-interference cancellation microwave photonics
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Polarization-based optimal detection scheme for digital self-interference cancellation in full-duplex system 被引量:1
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作者 Adil Khan Zhang Jinling +3 位作者 Muhammad Ayzed Mirza Sibghat Ullah Erum Ab basi Babar Hayat 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2020年第3期73-82,共10页
In order to detect and cancel the self-interference(SI)signal from desired binary phase-shift keying(BPSK)signal,the polarization-based optimal detection(POD)scheme for cancellation of digital SI in a full-duplex(FD)s... In order to detect and cancel the self-interference(SI)signal from desired binary phase-shift keying(BPSK)signal,the polarization-based optimal detection(POD)scheme for cancellation of digital SI in a full-duplex(FD)system is proposed.The POD scheme exploits the polarization domain to isolate the desired signal from the SI signal and then cancel the SI to obtain the interference-free desired signal at the receiver.In FD communication,after antenna and analog cancellation,the receiver still contains residual SI due to non-linearities of hardware imperfections.In POD scheme,a likelihood ratio expression is obtained,which isolates and detects SI bits from the desired bits.After isolation of these signal points,the POD scheme cancels the residual SI.As compared to the conventional schemes,the proposed POD scheme gives significantly low bit error rate(BER),a clear constellation diagram to obtain the boundary between desired and SI signal points,and increases the receiver's SI cancellation performance in low signal to interference ratio(SIR)environment. 展开更多
关键词 POLARIZATION full-duplex self-interference cancellation optimal detection
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A Wire-Line Secure Communication System Based on CCFD Self-Interference Cancellation
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作者 LU Wenjian LIU Sanjun LAI Guohong 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2021年第6期507-512,共6页
This paper presents a design scheme of wire-line telephone system using self-interference(SI)cancellation technology in co-frequency co-time full-duplex(CCFD)system to realize absolute secure communication at the phys... This paper presents a design scheme of wire-line telephone system using self-interference(SI)cancellation technology in co-frequency co-time full-duplex(CCFD)system to realize absolute secure communication at the physical layer.This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node,and then make use of the receiver’s knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain,so that the signal-to-noise ratio(SNR)received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver,so as to realize the absolutely secure communication in the sense of Wyner principle.This paper not only puts forward the specific design scheme of absolutely secure communication telephone,but also analyzes the calculation of security capacity under different eavesdropping positions,different SI cancellation capability and different system parameters according to Shannon theory. 展开更多
关键词 co-frequency co-time full-duplex(CCFD) physical layer security self-interference cancellation security capacity wire-line communication
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Analysis of RF Feedback Chain Isolation in Wireless Co-Time Co-Frequency Full Duplex
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作者 Juan Zhou Ying Shen +1 位作者 Ya-Juan Xue Li Li 《Journal of Electronic Science and Technology》 CAS CSCD 2018年第3期280-286,共7页
By employing a radio frequency(RF) feedback chain, the self-interference can be canceled efficiently in co-time co-frequency full duplex(CCFD). However, the evitable signal crosstalk which is caused by the imperfect R... By employing a radio frequency(RF) feedback chain, the self-interference can be canceled efficiently in co-time co-frequency full duplex(CCFD). However, the evitable signal crosstalk which is caused by the imperfect RF feedback chain isolation usually damages the self-interference cancelation(SIC) performance. To deal with this problem, firstly, we analyze the impact of RF feedback chain isolation on SIC performance. Then a digital preprocessing scheme with RF feedback chain is proposed in the multiple-antenna CCFD architecture. Using both analytical and experimental methods, we find that the proposed scheme achieves a better performance on SIC. 展开更多
关键词 Co-time co-frequency full duplex full duplex radio frequency feedback chain isolation radio frequency leakage signal self-interference cancellation
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Duplexer Design for Full-Duplex Based Wireless Communications
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作者 Hui Zhuang Jintao Li +1 位作者 Weibiao Geng Xiaoming Dai 《China Communications》 SCIE CSCD 2016年第11期1-13,共13页
The full-duplex(FD) based wireless communication devices,which are capable of concurrently transmitting and receiving signals with a single frequency band,suffer from a severe self-interference(SI) due to the large po... The full-duplex(FD) based wireless communication devices,which are capable of concurrently transmitting and receiving signals with a single frequency band,suffer from a severe self-interference(SI) due to the large power difference between the devices' own transmission and the useful signal comes from the remote transmitters. To enable the practical FD devices to be implementable,the SI power must be sufficiently suppressed to the level of background noise power,making the received signal-to-interference-plus-noise ratio(SINR) satisfy the decoding requirement. In this paper,the design and implementation of the duplexer for facilitating SI cancellation in FD based wireless communications are investigated,with a new type of duplexer(i.e. an improved directional coupler) designed for improving the spatial suppression of the SI power. Furthermore,the practical circuit boards are designed and verified for the proposed prototype,showing that the spatial suppression capability may be up to 36 d B(i.e. much higher than that attainable in the commonly designed ferrite circulator) by using the proposed design. 展开更多
关键词 full-duplex wireless communications self-interference cancellation DUPLEXER Directional coupler
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基于辅助符号的非线性自干扰抵消算法及其简化实现 被引量:1
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作者 王丹 黄开枝 李云洲 《电子与信息学报》 EI CSCD 北大核心 2017年第1期24-30,共7页
同频同时全双工是第5代(5G)通信关键技术之一,数字自干扰抵消算法是其重要研究方向。针对非线性数字自干扰抵消算法中,失真系数估计受到自干扰信道估计误差的影响这一问题,该文提出一种基于辅助符号的非线性自干扰抵消算法,通过对辅助... 同频同时全双工是第5代(5G)通信关键技术之一,数字自干扰抵消算法是其重要研究方向。针对非线性数字自干扰抵消算法中,失真系数估计受到自干扰信道估计误差的影响这一问题,该文提出一种基于辅助符号的非线性自干扰抵消算法,通过对辅助符号做自干扰抵消,将信道估计符号的失真误差映射到其抵消结果中并提取出来,从中估计失真系数。接着针对算法开销问题提出一种简化实现方案。仿真结果显示,接收自干扰信号为-5 d Bm时,算法可将自干扰非线性失真分量抵消至约-100 d Bm,且性能随接收自干扰功率降低而提高。 展开更多
关键词 5G 同频同时全双工 数字自干扰抵消 非线性失真估计
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一种抑制相位噪声的多通道变时延下变频全双工收发方法 被引量:2
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作者 全欣 刘颖 +1 位作者 范平志 唐友喜 《电子与信息学报》 EI CSCD 北大核心 2023年第5期1627-1634,共8页
相位噪声会限制全双工(FD)收发机的自干扰抑制能力,恶化有用信号解调性能,即使全双工收发机采用发射机、接收机共用本振的结构,也无法消除相位噪声的限制作用。为了降低多径自干扰(SI)分量中相位噪声的影响,该文提出一种多通道变时延下... 相位噪声会限制全双工(FD)收发机的自干扰抑制能力,恶化有用信号解调性能,即使全双工收发机采用发射机、接收机共用本振的结构,也无法消除相位噪声的限制作用。为了降低多径自干扰(SI)分量中相位噪声的影响,该文提出一种多通道变时延下变频全双工收发方法,具体包括可以补偿相位噪声的全双工收发机设计和能够抑制残余相位噪声的自干扰抑制算法。多通道变时延下变频全双工收发机采用多条通道接收同一天线的信号,各接收本振信号为经过不同延时调整的发射本振信号,可以在下变频时补偿多径自干扰中的相位噪声。自干扰抑制算法利用不同接收信号估计相位噪声参数,进一步降低残余相位噪声的影响。此外,该文推导了这种全双工收发方法的自干扰抑制能力,并给出了其随发射功率、接收通道数量的变化关系。分析与仿真结果表明,当接收通道数量高于自干扰信道强径数量时,多通道变时延下变频全双工接收方法不受相位噪声影响。 展开更多
关键词 全双工 相位噪声 自干扰抑制
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Energy Efficient MAC Protocol for Wireless Full-Duplex Networks 被引量:2
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作者 Yu Song Wangdong Qi Wenchi Cheng 《China Communications》 SCIE CSCD 2018年第1期35-44,共10页
The wireless full-duplex(FD) nodes can transmit and receive at the same time using the same frequency-band. Currently, the latest FD media access control(MAC) protocols mainly focus on how to convert the physical laye... The wireless full-duplex(FD) nodes can transmit and receive at the same time using the same frequency-band. Currently, the latest FD media access control(MAC) protocols mainly focus on how to convert the physical layer gains of FD nodes to the throughput gain of wireless FD networks, but pay little attention to the energy consumptions of FD nodes. In this paper, we propose an energy efficient FD MAC protocol. According to the values of self-interference cancellation coefficients corresponding to the nodes of each FD pair and the signal propagation attenuation, the proposed protocol can adaptively select the communication mode of the FD pair between the full-duplex and half-duplex. Also, the minimum transmit power for FD nodes can be obtained to achieve high energy efficiency. We develop an analytical model to characterize the performance of our protocol. The numerical results show that the proposed MAC protocol can optimize the system throughput and reduce the transmission energy consumptions of nodes simultaneously as compared with those of the existing works. 展开更多
关键词 wireless full-duplex networks MAC protocol energy efficient self-interference cancellation coefficient
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基于同频同时全双工自干扰消除的有线保密通信系统 被引量:1
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作者 陆文健 刘三军 来国红 《科学技术与工程》 北大核心 2023年第24期10379-10386,共8页
针对目前有线全双工通信系统中保密通信技术尚未成熟,在保密性能存在局限性,以同频同时全双工(co-frequency co-time full duplex,CCFD)系统的自干扰(self-interference,SI)消除理论为基础,提出一种物理层绝对安全的有线保密通信系统设... 针对目前有线全双工通信系统中保密通信技术尚未成熟,在保密性能存在局限性,以同频同时全双工(co-frequency co-time full duplex,CCFD)系统的自干扰(self-interference,SI)消除理论为基础,提出一种物理层绝对安全的有线保密通信系统设计方案,通过巧妙地在接收端向链路中释放同时同频大功率人造噪声的方式将目标信号隐藏起来,再利用接收机对噪声信号的已知性,借助CCFD系统的模拟域自干扰消除技术在接收机中实现高dB的SI消除,实现Wyner意义上的绝对安全的保密通信。依据香农理论分析了延迟时间差、窃听位置、传输线长度等因素对SI消除能力和系统安全容量的影响。结果表明:系统的安全容量始终大于零,达到绝对保密通信效果。 展开更多
关键词 同频同时全双工(CCFD) 物理层安全 人工噪声 自干扰(si)消除 安全容量 有线通信
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非理想收发机下的无线全双工自干扰消除技术分析 被引量:1
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作者 刘晓龙 魏贵明 《中国新通信》 2020年第7期89-91,共3页
在自干扰被充分抑制的前提下,全双工无线通信可以实现频谱效率翻倍的目标,这将很好的解决当前频谱资源短缺问题,并能进一步提高物理层的信息承载能力。然而,由于目前用于产业化的商用无线收发机设备大都采用高集成、低成本的射频前端,... 在自干扰被充分抑制的前提下,全双工无线通信可以实现频谱效率翻倍的目标,这将很好的解决当前频谱资源短缺问题,并能进一步提高物理层的信息承载能力。然而,由于目前用于产业化的商用无线收发机设备大都采用高集成、低成本的射频前端,受此影响,自干扰消除技术更具挑战。因此,重点介绍了几个较为突出的无线全双工收发机器件的非理性特性,通过建模分析了上述特性对自干扰消除技术的影响。通过探讨解决方案,分析了在非理想收发机上实现自干扰消除技术的主要难点,并提出了在数字域进一步消除自干扰的思路,从而推进无线全双工链路自干扰消除技术的发展。 展开更多
关键词 全双工无线通信 收发机器件非理想特性 自干扰消除
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Experimental full-duplex amplify-and-forward relay scheme for OFDM with power gain control
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作者 Pu Yang Xiang-Gen Xia +1 位作者 Qingyue Qu Yi Liu 《Journal of Information and Intelligence》 2024年第5期375-387,共13页
The fundamental challenges for full-duplex(FD)relay networks are the self-interference cancellation(SIC)and the cooperative transmission design at the relay.This paper presents a practical amplify-and-forward(AF)FD on... The fundamental challenges for full-duplex(FD)relay networks are the self-interference cancellation(SIC)and the cooperative transmission design at the relay.This paper presents a practical amplify-and-forward(AF)FD one-way relay scheme for orthogonal frequency division multiplexing(OFDM)transmission with multi-domain SIC.It is found that the residual self-interference(SI)signals at the relay can be regarded as an equivalent multipath model.The effects of the residual sI at the relay are incorporated into the equivalent end-to-end channel model,and the inter-block interference can be removed at the destination by using cyclic prefix(CP)protection.Based on the equivalent multipath model,we present a solution for optimizing the amplification factor on the performance of signal-to-interference-plus-noise ratio(SINR)when the equivalent multipath length is longer than the CP.Furthermore,a practical one way FD relay network with 3 nodes is built and measured.The simulation and measured results verify the superior performance of the proposed scheme. 展开更多
关键词 Full-duplex AMPLIFY-AND-FORWARD Gain control self-interference cancellation
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