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Proportional-Integral Observer Design for Multi-Rate Systems Under Decode-and-Forward Relays:Tackling Power-Dependent Packet Dropouts 认领 引用
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作者 Di Zhao Zidong Wang +2 位作者 Derui Ding Qing-Long Han Guoliang Wei 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第7期1558-1571,共14页
In this paper,the problem of proportional-integral observer(PIO)design is investigated for a class of discrete-time multi-rate systems with multiple sensors,with the sensor sampling periods being allowed to differ fro... In this paper,the problem of proportional-integral observer(PIO)design is investigated for a class of discrete-time multi-rate systems with multiple sensors,with the sensor sampling periods being allowed to differ from the system updating periods.The facilitation of communication between sensors and the remote PIO through wireless networks,which are subject to probabilistic packet dropouts,is achieved through the utilization of a decode-and-forward relay-based strategy.The occurrence of packet dropouts is governed by a Bernoulli-distributed random variable whose probability is dependent on the available transmission power.A decode-and-forward relay-based strategy,developed based on different components,is capable of processing information from different encoders at different physical locations.For the convenience of observer design,the lifting technique is employed with aim to cast the multi-rate system into a single-rate one.By establishing sufficient conditions,the combined effect of external noises and relaying-aided communication on estimation performance is intuitively illustrated.Subsequently,a PIO with an adjustable parameter is designed by solving certain optimization problems.A simulation example is finally provided to validate the theoretical results. 展开更多
关键词 Decode-and-forward relay multi-rate systems networked systems proportional-integral observer design power-dependent packet dropouts
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BER Modified Decode-and-Forward Protocol for OFDM-Based Linear Multihop Networks 认领 引用 被引量：3
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作者 MIAO Tingting WANG Ning +1 位作者 YANG Hongwen YANG Dachcng 《China Communications》 SCIE CSCD 2014年第11期34-43,共10页
In orthogonal frequency division multiplexing(OFDM)based multihop communications,the conventional decodeand-forward(DF)relay scheme severely suffers from the error propagation problem.This drawback is serious in multi... In orthogonal frequency division multiplexing(OFDM)based multihop communications,the conventional decodeand-forward(DF)relay scheme severely suffers from the error propagation problem.This drawback is serious in multihop networks as errors made by any relay node may fail the decoder at the destination in great chance.In this paper,we propose a bit error rate(BER)modified DF protocol(BMDF)which can be applied to systems where error correction channel coding and M-ary modulation are used.By modeling all links except the last one as a binary symmetric channel(BSC),we derive a log likelihood ratio(LLR)modification function relying only on the accumulated BER of all previous links to be applied to the output of the soft demapper.Furthermore,to reduce the computational complexity and signaling overhead,the modification function is simplified from its original exponential expression and less BERs are delivered between nodes by making successive subcarriers share the same BER.In addition,for situations where the channel state information(CSI)of forward link is available,the proposed BMDF can be further enhanced by combining with subcarrier pairing(SP)and power allocation(PA),where a sorted-channel gain SP scheme and a greedy PA algorithm are proposed.The simulation results verify thesignificant performance improvement to the conventional DF. 展开更多
关键词 wireless multihop networks decode-and-forward BER modified decode-and-forward(BMDF) OFDM M-arymodulation subcarrier pairing(SP) powerallocation(PA)
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Decode-and-Forward Relay Based Bidirectional Wireless Information and Power Transfer 认领 引用 被引量：3
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作者 Ruirui Chen Hailin Zhang 《China Communications》 SCIE CSCD 2017年第8期176-183,共8页
In this paper, we propose the decode-and-forward(DF) based bidirectional wireless information and power transfer(BWIPT) in two-hop relay systems, where the bidirectional relay can decode and forward information from t... In this paper, we propose the decode-and-forward(DF) based bidirectional wireless information and power transfer(BWIPT) in two-hop relay systems, where the bidirectional relay can decode and forward information from the user to the access point(AP), and assist the wireless power transfer from the AP to the user. To maximize the information rate from the user to the AP, we derive the closed form expression of the optimal power splitting(PS) factor, and the time allocation scheme to obtain the optimal time switching(TS) factor. Simulation results show that for both PS and TS protocols, the proposed DF based bidirectional relay systems can improve the information rate as compared with the amplify-and-forward(AF) based bidirectional relay systems. 展开更多
关键词 decode-and-forward wireless power transfer bidirectional relay power splitting time switching
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Generalized Maximum Likelihood Noncoherent Block Detection for Decode-and-Forward Relay Systems 认领 引用
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作者 HE Yucheng QIAO Ying ZHOU Lin 《China Communications》 SCIE CSCD 2014年第4期163-171,共9页
This paper considers noncoherent cooperative decode-and-forward(DF)halfduplex multi-branch relay systems.Each relay branch is modeled as a probabilistic transition system at the last hop,and thus it can be considered ... This paper considers noncoherent cooperative decode-and-forward(DF)halfduplex multi-branch relay systems.Each relay branch is modeled as a probabilistic transition system at the last hop,and thus it can be considered as a relaying chain comprising multi-hop relays.An approximation to the generalized maximum likelihood(ML)noncoherent block detection is derived for uncoded M-ary modulation in a faded noisy environment.In particular,the derived noncoherent block detection in a noiseless case is equivalent to a multichannel reception with full diversity.Furthermore,the generalized detection is extended specifically to block coded M-ary phase shift keying(MPSK)modulation.For a DF three node relay system using block coded quadrature phase shift keying(QPSK),simulation results are provided to examine the end-to-end error performance of the noncoherent detection with considering the effects of network geometry and power allocation,respectively.It is shown that under a fixed power allocation,a proper relay placement can yield near full diversity for large signal-to-noise ratio. 展开更多
关键词 cooperative communications decode-and-forward MPSK noncoherent detection
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Performance analysis of diffusion-based decode-and-forward relay with depleted molecule shift keying 认领 引用
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作者 Jiaxing Wang Mugen Peng Yaqiong Liu 《Digital Communications and Networks》 SCIE EI CSCD 2021年第3期399-409,共11页
The distance-decay effect of molecular signals makes communication range a major challenge for diffusion-based Molecular Communication(MC).To solve this problem,the intermediate nano-machine is deployed as a relay bet... The distance-decay effect of molecular signals makes communication range a major challenge for diffusion-based Molecular Communication(MC).To solve this problem,the intermediate nano-machine is deployed as a relay between the transmitter and its intended receiver nano-machines.In this work,we employ the Depleted Molecule Shift Keying(D-MoSK)to model a Decode-and-Forward(DF)relay communication scheme.The closed-form expression of Bit Error Rate(BER)for the concerned DF relay with D-MoSK is derived.Meanwhile,the maximum a posteriori probability,minimum error probability,and maximum likelihood schemes are formulated for data detection.The relationships between BER and other key parameters,including the number of released molecules,receiving radius,and relay position,are investigated in detail.Simulation results show that the proposed scheme can improve communication reliability significantly.Moreover,the performance gain can be maximized by optimizing the position of the relay and the receiving radius. 展开更多
关键词 Diffusion Molecular communication Decode-and-Forward relay Bit error rate
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Outage performance of OFDM-based selective decode-and-forward cooperative networks over Weibull fading channels 认领 引用
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作者 Cai Chunxiao Yang Wendong Cai Yueming 《High Technology Letters》 EI CAS 2011年第3期285-289,共5页
The outage performance of OFDM-based decode-and-forward cooperative networks is studied. The channels are modeled as independent Weibull distributed coefficients. A closed-form expression for the outage probability is... The outage performance of OFDM-based decode-and-forward cooperative networks is studied. The channels are modeled as independent Weibull distributed coefficients. A closed-form expression for the outage probability is obtained for three selective relaying schemes in the Weibull fading channels and a derived optimum power allocation method based on the closed form expressions of outage probability debases the outage probability. Monte Carlo simulations verify the analytical results. 展开更多
关键词 OFDM cooperative communication Weibull fading channels decode-and-forward outage probability.
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SER PERFORMANCE ANALYSIS OF DECODE-AND-FORWARD COOPERATIVE SCHEME IN SATELLITE MOBILE CHANNEL 认领 引用
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作者 Jie Xiao Zhang Gengxin Zang Guozhen Feng Shaodong 《Journal of Electronics(China)》 2011年第2期215-221,共7页
In this paper,Symbol-Error-Rate(SER) performance analysis is provided for a Decode-and-Forward(DF) cooperative scheme in satellite mobile channel environment.We present a satellite mobile cooperative communication sys... In this paper,Symbol-Error-Rate(SER) performance analysis is provided for a Decode-and-Forward(DF) cooperative scheme in satellite mobile channel environment.We present a satellite mobile cooperative communication system model and derive two generalized error probability ex-pressions with Cyclical Redundancy Check(CRC) or not.We also derive and simulate SER of the proposed system over different satellite mobile channels.The results show that the analytical results are in great accordance with the ones obtained by simulation.Also,it was shown that,whether or not adopt CRC depends on the channel link quality between the source node and the relay node. 展开更多
关键词 Satellite communication Cooperative communication Decode-and-Forward(DF)
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Security-Reliability Tradeoff Analysis for Jamming Aided Decode-and-Forward Relay Networks 认领 引用 被引量：1
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作者 Zou Ronggui Zou Yulong +1 位作者 Zhu Jia Li Bin 《China Communications》 SCIE CSCD 2024年第5期218-228,共11页
In this paper,we explore a cooperative decode-and-forward(DF)relay network comprised of a source,a relay,and a destination in the presence of an eavesdropper.To improve physical-layer security of the relay system,we p... In this paper,we explore a cooperative decode-and-forward(DF)relay network comprised of a source,a relay,and a destination in the presence of an eavesdropper.To improve physical-layer security of the relay system,we propose a jamming aided decodeand-forward relay(JDFR)scheme combining the use of artificial noise and DF relaying which requires two stages to transmit a packet.Specifically,in stage one,the source sends confidential message to the relay while the destination acts as a friendly jammer and transmits artificial noise to confound the eavesdropper.In stage two,the relay forwards its re-encoded message to the destination while the source emits artificial noise to confuse the eavesdropper.In addition,we analyze the security-reliability tradeoff(SRT)performance of the proposed JDFR scheme,where security and reliability are evaluated by deriving intercept probability(IP)and outage probability(OP),respectively.For the purpose of comparison,SRT of the traditional decode-and-forward relay(TDFR)scheme is also analyzed.Numerical results show that the SRT performance of the proposed JDFR scheme is better than that of the TDFR scheme.Also,it is shown that for the JDFR scheme,a better SRT performance can be obtained by the optimal power allocation(OPA)between the friendly jammer and user. 展开更多
关键词 decode-and-forward relay friendly jammer physical layer security power allocation security-reliability tradeoff
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Ergodic Capacity Evaluation of Multi-Hop Decode-and-Forward MIMO-OFDM Relaying Network 认领 引用
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作者 Latif Jan Mohammad Haseeb Zafar +2 位作者 Abdul Waheed Mahdi Zareei Faisal Alanazi 《Computers, Materials & Continua》 SCIE EI 2021年第9期3133-3145,共13页
Spatial diversity plays a significant role in wireless communication systems,including the Fourth Generation(4G)and Fifth Generation(5G)systems,and it is expected to be a fundamental part of the future wireless commun... Spatial diversity plays a significant role in wireless communication systems,including the Fourth Generation(4G)and Fifth Generation(5G)systems,and it is expected to be a fundamental part of the future wireless communication systems as well.The Multiple-Input Multiple-Output(MIMO)technology,which is included in the IEEE 802.16j standard,still holds the most crucial position in the 4G spectrum as it promises to improve the throughput,capacity,spectral,and energy efficiency of wireless communication systems in the 2020s.This makes MIMO a viable technology for delay constrained medical and health care facilities.This paper presents an approximate closed-form expression of the ergodic capacity for the Decode-and-Forward(DF)protocol MIMO-Orthogonal Frequency Division Multiplexing(OFDM)relaying network.Although MIMO-OFDM is highly valuable for modern high-speed wireless communication systems,especially in the medical sciences,its performance degrades in multi-hop relay networks.Therefore,in this paper,an approximate closed-form expression is derived for an end-to-end ergodic capacity of multi-hop DF MIMO-OFDM wireless communication system has been presented.Monte-Carlo simulations are conducted to verify the performance of the presented analysis regarding the capacity(bits/s/Hz)for different SNR-dB values for single,2×2,4×4,and multi-hop DF MIMOOFDM systems.The presented results provide useful insights for the research on the end-to-end ergodic capacity evaluation. 展开更多
关键词 Multiple-input multiple-output system decode-and-forward protocol orthogonal frequency division multiplexing ergodic capacity
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Diversity-multiplexing tradeoff of half-duplex multi-input multi-output two-way relay channel with decode-and-forward protocol 认领 引用
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作者 苏玉萍 Li Ying Liu Yang 《High Technology Letters》 EI CAS 2015年第3期364-370,共7页
A multi-input multi-output(MIMO) separated two-way relay channel(STWRC) is considered,where two users exchange their messages via a relay node.When each link is quasi-static Rayleigh fading,the achievable diversity-mu... A multi-input multi-output(MIMO) separated two-way relay channel(STWRC) is considered,where two users exchange their messages via a relay node.When each link is quasi-static Rayleigh fading,the achievable diversity-multiplexing tradeoff(DMT) of the half-duplex STWRC is analyzed.Firstly,the achievable DMT of the STWRC with static decode-and-forward(DF) protocol is obtained.Then,a dynamic decode-and-forward(DDF) protocol for the STWRC is proposed,where the relay listening time varies dynamically with the channel qualities of the links between two users and the relay.Finally,the achievable DMT of the proposed DDF protocol is derived in a case-bycase manner.Numerical examples are also provided to verify the theoretical analysis of both protocols. 展开更多
关键词 two-way relay channel （TWRC） half-duplex diversity-multiplexing tradeoff（DMT） decode-and-forward （ DF） outage probability
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Distributed filtering for time-varying systems with state saturation and deception attacks:A dynamic decode-and-forward relay scheme 认领 引用
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作者 Shipei CAI Jinling LIANG 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2026年第6期283-300,共18页
This article tackles the distributed filtering problem over wireless sensor networks for a class of time-varying systems with state saturation and deception attacks.To ensure more reliable and secure data transmission... This article tackles the distributed filtering problem over wireless sensor networks for a class of time-varying systems with state saturation and deception attacks.To ensure more reliable and secure data transmission,a novel dynamic decodeand-forward(DDaF)relay scheme is proposed,implemented through coordinated encoders deployed at the sensors'side and decoders deployed at the relay nodes'side.The network-based deception attacks occur probabilistically across the communication channels and are characterized by independent Bernoulli random sequences.This study is primarily intended to design distributed filters that effectively estimate the system states in the presence of state saturation,DDaF relays and deception attacks.By employing the stochastic analysis and matrix theories,upper bounds on the second-moment matrices of the filtering errors are derived for the considered system,and subsequently such bounds are minimized with designed filter gains.Furthermore,rigorous mathematical analysis is conducted to examine the uniform boundedness of the upper bounds and their monotonicity with respect to the deception attacks.Finally,simulation results demonstrate effectiveness of the proposed distributed filtering strategy. 展开更多
关键词 distributed filtering state saturation deception attack dynamic decode-and-forward relay filtering performance
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State Estimation for 2-D Markov Jump Systems With Multiple Observation Delays Over Decoded-and-Forward Relay Channels 认领 引用
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作者 Yufan Wang Chunyan Han +1 位作者 Wei Wang Tao Shen 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第5期1217-1235,共19页
This paper addresses the recursive state estimation problem for two-dimensional Markov jump systems(2-D MJSs)subject to multi-channel observation delays and packet losses under the decoded-and-forward(DaF)relay-based ... This paper addresses the recursive state estimation problem for two-dimensional Markov jump systems(2-D MJSs)subject to multi-channel observation delays and packet losses under the decoded-and-forward(DaF)relay-based protocol.To enhance signal propagation distance and quality,the DaF relaybased policy is deployed to schedule data transmission over the sensor-to-estimator channels.An encoding-decoding mechanism related to the jumping parameter is introduced to transform the initial measurements into delayed decoded observations.The packet dropouts are considered to occur in the relay-to-estimator channels and are modeled as mutually uncorrelated Bernoulli random variables.Moreover,on grounds of 2-D reorganization observation technology,the delayed decoded signals transmitted through DaF relay channels are transformed into delay-free decoded measurements.The goal of this paper is to develop a recursive state estimator based on the reconstructed delay-free model,aiming to minimize the upper bounds of the filtering error variances.By applying matrix inequality theory and the inductive method,specific upper bounds on the filtering error covariances are derived.Then,the expected filter gain parameters are designed to minimize these bounds by solving a series of 2-D Riccati difference equations,and the boundedness performance of the proposed recursive filter algorithm is investigated.Finally,a simulation example is provided to demonstrate the effectiveness of the devised filter strategy. 展开更多
关键词 2-D Markov jump system(2-D MJS) boundedness analysis decode-and-forward relay observation delays recursive filter
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Transmission scheme and performance analysis for decode-and-forward MIMO two-way relay systems 认领 引用 被引量：11
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作者 ZHAO Rui YANG LuXi ZHU WeiPing 《Science in China(Series F)》 2009年第12期2308-2316,共9页
In rd （DF） MIMO two-way relay systems, the transmission schemes are designed and the closed-form expressions for the outage probability and average symbol error rate （ASER） of the twoway relay system are derived b... In rd （DF） MIMO two-way relay systems, the transmission schemes are designed and the closed-form expressions for the outage probability and average symbol error rate （ASER） of the twoway relay system are derived based on two different scenarios of channel state information （CSI）. For perfect CSI, the maximum-ratio-transmission and combining （MRT-MRC） technique is applied to design the beamforming and combining vectors. Without perfect CSI, the transmission scheme with limited feedback is designed, and the analytical results are verified through two kinds of codebooks, i.e., random vector quantization and Grassmann. The simulation results show that, the proposed transmission schemes for the two-way relay system can outperform other transmission schemes in the performance of outage probability and ASER, and the accuracy of the derived closed-form expressions is also verified by the numerical simulations. 展开更多
关键词 decode-and-forward two-way relay outage probability average symbol error rate MRT-MRC limited feedback
Closed-form expressions for outage probability of decode-and-forward relaying over Nakagami-m fading channels 认领 引用 被引量：3
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作者 CHUAI Gang LI Xiu-xin +2 位作者 LIU Sheng HU Yang SHI Fang-wen 《The Journal of China Universities of Posts and Telecommunications》 EI 2010年第2期72-75,共4页
In this article, an exact closed-form expression is derived for outage probability of decode-and-forward （DF） cooperative communications over independent identically distributed Nakagami-m fading channels. Simulatio... In this article, an exact closed-form expression is derived for outage probability of decode-and-forward （DF） cooperative communications over independent identically distributed Nakagami-m fading channels. Simulation results verify that the theoretical expressions for the outage probability are correct. The optimal power allocation based on the derived outage probability is also studied. 展开更多
关键词 decode-and-forward Nakagami-m fading ,outage probability optimal power allocation
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Diversity order of decode-and-forward MIMO relaying with transmit antenna selection 认领 引用
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作者 CAO Lei YANG Hong-wen ZHANG Xin YANG Da-cheng 《The Journal of China Universities of Posts and Telecommunications》 EI 2009年第5期1-7,共7页
This article analyzes the diversity order of several proposed schemes, where the transmit antenna selection （TAS） strategies are combined with low-complexity decode-and-forward （DF） protocols in the multiple-input... This article analyzes the diversity order of several proposed schemes, where the transmit antenna selection （TAS） strategies are combined with low-complexity decode-and-forward （DF） protocols in the multiple-input multiple-output （MIMO） relaying scenario. Although antenna selection is a suboptimal form of beamforming, it enjoys the advantages of tractable optimization and low feedback overhead. Specifically, this article proposes schemes that combine TAS strategies with fixed decode-and-forward （FDF） and selection decode-and-forward （SDF） protocols. Following that, the asymptotic expressions of outage probabilities are derived and the diversity order of the proposed schemes analyzed. These kinds of combination of transmit antenna selection strategies and low-complexity decode-and-forward protocols can achieve partial diversity order in the MIMO relaying scenario. The numerical simulations verify the analysis. 展开更多
关键词 transmit antenna selection decode-and-forward MIMO relaying outage probability diversity order
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Power Allocation for NOMA in D2D Relay Communications 认领 引用 被引量：8
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作者 Yan Cai Chunhua Ke +2 位作者 Yiyang Ni Jun Zhang Hongbo Zhu 《China Communications》 SCIE EI CSCD 2021年第1期61-69,共9页
Non-orthogonal multiple access(NOMA)is considered as one of the key technologies for the fifth generation(5G)wireless communications.The integration of NOMA and device-to-device(D2D)communications has recently attract... Non-orthogonal multiple access(NOMA)is considered as one of the key technologies for the fifth generation(5G)wireless communications.The integration of NOMA and device-to-device(D2D)communications has recently attracted wide attention.In this paper,a relaying D2D communications assisted with cooperative relaying systems using NOMA(DRC-NOMA)is considered.We analyze the ergodic sum-rate for the proposed system and then derive the closed-form expressions.In addition,an optimal power allocation strategy maximizing the ergodic sum-rate is proposed based on these analysis results.Numerical results show the good agreement between the results of analysis and Monte Carlo method.The proposed DRC-NOMA has a great improvement of the ergodic sum-rate in the small regime of average channel gain of D2D pair. 展开更多
关键词 device-to-device communication nonorthogonal multiple access decode-and-forward relaying power allocation rate analysis
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Outage Probability Minimization for Low-Altitude UAV-Enabled Full-Duplex Mobile Relaying Systems 认领 引用 被引量：7
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作者 Meng Hua Yi Wang +3 位作者 Zhengming Zhang Chunguo Li Yongming Huang Luxi Yang 《China Communications》 SCIE CSCD 2018年第5期9-24,共16页
In this paper, a novel unmanned aerial vehicle(UAV)-enabled full duplex decode-and-forward(DF) technique is used in mobile relaying system. Compared with conventional static relaying, mobile relaying provides more deg... In this paper, a novel unmanned aerial vehicle(UAV)-enabled full duplex decode-and-forward(DF) technique is used in mobile relaying system. Compared with conventional static relaying, mobile relaying provides more degree of freedom for experiencing better channel conditions and further improving the system reliable performance. The source and relay transmit power as well as relay trajectory are jointly optimized for sum outage probability minimization in mobile relaying system. Due to the non-convex nature of the original problem, block coordinate decent optimization techniques are employed to decompose it into two sub-problems, which leads to an efficient iterative algorithm. Specifically, for the pre-determined relay trajectory, the optimal transmit power of source and relay are obtained by solving Karush-Kuhn-Tucker(KKT) conditions. For the given sourceelay power allocation, the optimal UAV trajectory is obtained by solving dual problem. Based on the two steps, an iterative algorithm is proposed to jointly optimize sourceelay power allocation and UAV trajectory alternately. Numerical results show the performance gain of our proposed scheme. 展开更多
关键词 unmanned aerial vehicle decode-and-forward full-duplex power allocation trajectory optimization
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Performance Analysis of NOMA-Based Cooperative Networks with Relay Selection 认领 引用 被引量：10
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作者 Ronglan Huang Dehuan Wan +4 位作者 Fei Ji Hua Qing Jie Li Hua Yu Fangjiong Chen 《China Communications》 SCIE CSCD 2020年第11期111-119,共9页
Non-orthogonal multiple access(NOMA)technique is an expert on channel differences exploiting.In this paper,a dual-hop NOMA-based cooperative relaying network where a best relay is selected as an active node to accompl... Non-orthogonal multiple access(NOMA)technique is an expert on channel differences exploiting.In this paper,a dual-hop NOMA-based cooperative relaying network where a best relay is selected as an active node to accomplish the communication between a source and a destination is discussed.We assume that both decode-and-forward(DF)and amplify-and-forward(AF)protocols are applied to the selected relay.The metrics that ergodic sum-rate and outage probability are investigated,and the closed-form expressions of the latter for DF and AF protocols are derived.Numerical and simulation results are conducted to verify the validity of the theoretical analysis,in which we can see that the NOMA based DF relaying is better than the NOMA based AF relaying and other existing NOMA-based cooperative communication schemes. 展开更多
关键词 non-orthogonal multiple access(NOMA) decode-and-forward(DF) amplify-and-forward(AF) relay selection ergodic sum-rate outage probability
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Bilayer expurgated LDPC codes with uncoded relaying 认领 引用 被引量：7
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作者 Md.Noor-A-Rahim Nan Zhang +1 位作者 Sk.Md.Rabiul Islam Y.L.Guan 《Digital Communications and Networks》 SCIE 2017年第3期176-179,共4页
Bilayer low-density parity-check(LDPC)codes are an effective coding technique for decode-and-forward relaying,where the relay forwards extra parity bits to help the destination to decode the source bits correctly.In t... Bilayer low-density parity-check(LDPC)codes are an effective coding technique for decode-and-forward relaying,where the relay forwards extra parity bits to help the destination to decode the source bits correctly.In the existing bilayer coding scheme,these parity bits are protected by an error correcting code and assumed reliably available at the receiver.We propose an uneoded relaying scheme,where the extra parity bits are forwarded to the destination without any protection.Through density evolution analysis and simulation results,we show that our proposed scheme achieves better performance in terms of bit erasure probability than the existing relaying scheme.In addition,our proposed scheme results in lower complexity at the relay. 展开更多
关键词 Bilayer codes LDPC codes Density evolution Decode-and-forward relaying
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Distributed Cooperative OFDM-IM System 认领 引用 被引量：5
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作者 Hua Qing Hua Yu +3 位作者 Yun Liu Wei Duan Miaowen Wen Fei Ji 《China Communications》 SCIE CSCD 2020年第9期167-176,共10页
This paper considered a multi-relay distributed cooperative system in which not only the source communicates with the destination,but also the relays have communication requests with the destination.In order to achiev... This paper considered a multi-relay distributed cooperative system in which not only the source communicates with the destination,but also the relays have communication requests with the destination.In order to achieve the requirements of simultaneous communication for the source and relays,we propose a distributed cooperative system based on orthogonal frequency division multiplexing with index modulation(OFDM-IM).In this system,the relay can communicate with the destination by superimposing its own signal over the inactive subcarriers on the decoded OFDM-IM signal.Upper bounds on the bit error rates of the source and the active relay are both derived in closed form,whose tightness is verified through simulation results. 展开更多
关键词 OFDM index modulation(IM) maximum-likelihood(ML) decode-and-forward(DF) bit error rate(BER)
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