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MPDAF方法和DF方法在抗距离拖引干扰中的应用
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作者 郭超 《海军航空工程学院学报》 2007年第1期151-154,共4页
利用Monte Carlo方法,对修正的概率数据互联滤波(MPDAF)和分解融合方法(DF)在有虚警测量的环境下抗距离拖引干扰的性能进行了分析和比较.研究表明,在虚警测量较少的情况下,采用MPDAF算法和DF算法可以有效地抗距离后拖欺骗干扰,实现对目... 利用Monte Carlo方法,对修正的概率数据互联滤波(MPDAF)和分解融合方法(DF)在有虚警测量的环境下抗距离拖引干扰的性能进行了分析和比较.研究表明,在虚警测量较少的情况下,采用MPDAF算法和DF算法可以有效地抗距离后拖欺骗干扰,实现对目标的跟踪,但是在虚警测量较多的情况下,采用DF方法可以较好地对抗距离后拖欺骗干扰,实现对目标的跟踪,而MPDAF方法则基本失去作用. 展开更多
关键词 分解融合方法 修正的概率数据互联滤波 距离拖引干扰 性能分析
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Joint Subcarrier and Power Allocation for DF-Based Multiuser Two-Way Relay Networks
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作者 Xiang Chen Fei He +1 位作者 Limin Xiao Shidong Zhou 《China Communications》 SCIE CSCD 2017年第6期179-188,共10页
Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only ... Two-way decode-and-forward(DF) relay technique is an efficient method to improve system performance in 5G networks.However,traditional orthogonal frequency division multiplexing(OFDM) based two-way relay systems only consider a per-subcarrier relay strategy,which treats each subcarrier as a separate channel,which results in significant sum rate loss,especially in fading environments.In this paper,a joint coding scheme over multiple subcarriers is involved for multipair users in two-way relay systems to obtain multiuser diversity.A generalized subcarrier pairing strategy is proposed to permit each user-pair to occupy different subcarriers during the two transmission phases,i.e.,the multiple access and broadcast phases.Moreover,a low complexity joint resource allocation scheme is proposed to improve the spectrum efficiency with an additional multi-user diversity gain.Some numerical simulations are finally provided to verify the efficacy of our proposal. 展开更多
关键词 two-way relay orthogonal frequency division multiplexing (OFDM) decode-and-forward (df power allocation
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SER PERFORMANCE ANALYSIS OF DECODE-AND-FORWARD COOPERATIVE SCHEME IN SATELLITE MOBILE CHANNEL
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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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A LOWER COMPLEXITY ANTENNA SELECTION FOR DF RELAY MIMO SYSTEMS
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作者 Chen Mingxue Xu Chengqi 《Journal of Electronics(China)》 2011年第3期320-327,共8页
Based on the existing incremental selection algorithm for Decode-and-Forward (DF) Multiple Input Multiple Output (MIMO) systems, a faster one which combines the incremental selection with the decremental exclussion is... Based on the existing incremental selection algorithm for Decode-and-Forward (DF) Multiple Input Multiple Output (MIMO) systems, a faster one which combines the incremental selection with the decremental exclussion is proposed. Firstly, the algorithm selects one antenna which makes the increment of the capacity greatest in every step. Then, excludes the antennas whose contribution to the capacity is less than μ% of that of the best antenna. Simulations show that the proposed algorithm achieves comparable performance to the existing one and has obviously decreased complexity under the appropriate threshold μ% . 展开更多
关键词 Multiple-Input Multiple-Output (MIMO) RELAY decode-and-forward (df) Antenna selection
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Diversity-multiplexing tradeoff of half-duplex multi-input multi-output two-way relay channel with decode-and-forward protocol
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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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概率译码转发中继系统中的安全极化编码方法
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作者 白慧卿 金梁 +1 位作者 黄开枝 易鸣 《电子与信息学报》 EI CSCD 北大核心 2018年第9期2112-2118,共7页
该文针对中继节点依概率辅助译码转发的通信场景,提出一种中继辅助的安全极化编码方法,保证私密信息可靠传输的同时,达到提高安全传输速率的目的。首先,发送端分别进行两层极化编码——中继概率转发行为构成的虚拟二进制删除信道下的极... 该文针对中继节点依概率辅助译码转发的通信场景,提出一种中继辅助的安全极化编码方法,保证私密信息可靠传输的同时,达到提高安全传输速率的目的。首先,发送端分别进行两层极化编码——中继概率转发行为构成的虚拟二进制删除信道下的极化编码和实际传输信道下的极化编码,并将私密信息分别隐藏在两层码字中,分时隙广播出去。然后,中继依概率译码后提取出合法用户无法直接接收的固定信息再次进行安全极化编码并转发。最后,接收端利用收到的中继转发码字和发端码字依次分层进行译码。理论和仿真分析证明,所提方法下合法用户能够可靠接收私密信息,而窃听者无法获取任何私密信息信息量;安全传输速率随着码长和中继转发概率的增加而增大,且高于一般的安全极化编码方法。 展开更多
关键词 极化编码 物理层安全 中继 概率译码转发
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基于距离信息的多站多目标数据融合
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作者 牛涛 陈卫东 安志忠 《火控雷达技术》 2004年第2期8-15,共8页
在基于距离测量信息的多站系统中 ,将单传感器联合概率数据关联滤波 ( JPDA)推广到了多传感器场合。对 MSJPDA的两种常用实现结构 ,采用深度优先搜索算法 ( DFS)实现可行联合事件的快速生成 。
关键词 距离测量信息 多站多目标数据融合 传感器 联合概率数据关联滤波
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Performance Analysis of NOMA-Based Cooperative Networks with Relay Selection 被引量:9
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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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Distributed Cooperative OFDM-IM System 被引量:4
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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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Differential space-time modulation based on orthogonal design for cooperative network
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作者 丁盛 《High Technology Letters》 EI CAS 2008年第4期359-363,共5页
Differential modulation was widely used for wireless networks in which channel estimation was diffi-cult.Based on orthogonal design,a novel distributed differential space-time coding/decoding scheme forM-PSK modulatio... Differential modulation was widely used for wireless networks in which channel estimation was diffi-cult.Based on orthogonal design,a novel distributed differential space-time coding/decoding scheme forM-PSK modulations was proposed,which had a high code rate of 2/3 and second-order diversity for thetwo-user cooperative networks.The performance of decode-and-forward (DF) protocols was evaluated.Simulations show that the differential space-time modulation scheme in this paper has better bit error rate(BER) performance or higher code rate than the schemes proposed by Tarasak and Wang when interuserchannel states are good enough.The impacts of transmission error between two users for the whole systemBER performance were also investigated. 展开更多
关键词 differential space-time modulation decode-and-forward (df orthogonal design cooperative diversity
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Performance analysis of selection cooperative networks over asymmetric fading channels
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作者 郭卫栋 Liu Ju +1 位作者 Liu Yuxi Zhang Guowei 《High Technology Letters》 EI CAS 2013年第1期53-57,共5页
The performances of selection cooperation are investigated over asymmetric fading channels where the source-relay and the relay-destination channels experience Nakagami-m and Rayleigh fading,respectively.Decode-and-fo... The performances of selection cooperation are investigated over asymmetric fading channels where the source-relay and the relay-destination channels experience Nakagami-m and Rayleigh fading,respectively.Decode-and-forward(DF)protocol is adopted and the Nth best relay is selected from M available relays.Probability density function(PDF)for the instantaneous signal-to-noise ratio(SNR)at the destination is derived first.Then,it is used to derive the exact expressions for outage probability and average symbol error rate(SER).The results hold for arbitrary M or N.Finally,simulations are carried out to verify the correctness of our theoretical analysis and results show that M and N almost have the same effect on the performance of outage probability and SER. 展开更多
关键词 selection cooperation asymmetric Nth best relay fading channel decode-and-forward (df the
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Relay Selection Strategy in the Secure Cooperative Communications System
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作者 Hsin-Ying Liang Cheng-Ying Yang Wei-Liang Wu 《Journal of Electronic Science and Technology》 CAS CSCD 2017年第3期271-276,共6页
With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in ... With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in the system,the scenario includes multiple source stations,multiple relay stations,multiple destination stations,and eavesdroppers.To analyze the optimal relay selection in the system,we begin with the performance analysis for a single source station and a single destination station.By applying two cooperative models,the amplify-andforward(AF) mode and decode-and-forward(DF)mode,the secrecy capacity is derived.Then,we apply the derived results to the considered environment to find the optimal relay assignment.By the way,the relay selection can be obtained by the exhaustive search algorithm.However,there are a lot of steps needed if the number of source stations is large.Hence,applying the characters of the cooperative modes in the relay selection,the pre-selection step is proposed with a mathematical derivation.It could be used for the practical situation without a long-time calculation. 展开更多
关键词 Index Terms--Amplify-and-forward (AF) mode exhaustive search method fixed decode-and-forward(df mode mutual information relay selection secrecycapacity secure cooperative communications.
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A Cooperative Diversity Analysis of Two User Mobile Communication System with Maximal Ratio Combining
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作者 Sateeshkrishna Dhuli V. V. Mani 《Communications and Network》 2013年第2期134-139,共6页
Cooperative communication is going to play a vital role in the next generation wireless networks. In this paper we derive the expression for symbol error probability (SEP) of a two-user cooperative diversity system, w... Cooperative communication is going to play a vital role in the next generation wireless networks. In this paper we derive the expression for symbol error probability (SEP) of a two-user cooperative diversity system, where two users cooperate through the decode-and-forward (DF) relaying with binary phase-shift keying (BPSK) modulation in a flat Rayleigh fading environment. We compare the computational results obtained by the SEP expression with the simulation results using maximal-ratio combining (MRC), equal-gain combining (EGC) and selection combining (SC) techniques. Numerical results show the performance of a cooperative diversity system with maximal-ratio combining is giving better results compared to SC and EGC techniques. 展开更多
关键词 Symbol Error Probability (SEP) Maximal-Ratio COMBINING (MRC) Equal-Gain COMBINING (EGC) Selection COMBINING (SC) decode-and-forward (df) RELAYING
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Transmit Power Optimization for Relay-Aided Multi-Carrier D2D Communication 被引量:2
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作者 Muhammad Waqas Guftaar Ahmad Sardar Sidhu +2 位作者 Tayyaba Jabeen Muhammad Afaq Ahmad Muhammad Awais Javed 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2018年第1期65-74,共10页
In this paper, we consider the power optimization problem in Orthogonal Frequency Division Multiplexing (OFDM)-based relay-enhanced device-to-device (D2D) communication. In a single cell transmission scenario, dua... In this paper, we consider the power optimization problem in Orthogonal Frequency Division Multiplexing (OFDM)-based relay-enhanced device-to-device (D2D) communication. In a single cell transmission scenario, dual- hop communication is assumed in which each D2D user re-uses the spectrum of just one Cellular User (CU). In this work, we formulate a joint optimization scheme under a Decode-and-Forward (DF) relaying protocol to maximize the sum throughput of D2D and cellular networks via power allocation over different sub-carriers. The problem is thus transformed into a standard convex optimization, subject to individual power constraints at different transmitting nodes. We exploit the duality theory to decompose the problem into several sub-problems and use Karush-Kuhn- Tucker (KKT) conditions to solve each sub-problem. We provide simulation results to validate the performance of our proposed scheme. 展开更多
关键词 device-to-device communication Orthogonal Frequency Division Multiplexing (OFDM) decode-and-forward (df relay transmission power optimization
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Joint throughput and transmission range optimization for triple-hop networks with cognitive relay
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作者 Cheng ZHAO Wan-liang WANG +1 位作者 Xin-wei YAO Shuang-hua YANG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2017年第2期253-261,共9页
The optimization of the network throughput and transmission range is one of the most important issues in cognitive relay networks (CRNs). Existing research has focused on the dual-hop network, which cannot be extend... The optimization of the network throughput and transmission range is one of the most important issues in cognitive relay networks (CRNs). Existing research has focused on the dual-hop network, which cannot be extended to a triple-hop network due to its shortcomings, including the limited transmission range and one-way communication. In this paper, a novel, triple-hop relay scheme is proposed to implement time-division duplex (TDD) transmission among secondary users (SUs) in a three-phase transmission. Moreover, a superposition coding (SC) method is adopted for handling two-receiver cases in triple-hop networks with a cognitive relay. We studied a joint optimization of time and power allocation in all three phases, which is formulated as a nonlinear and concave problem. Both analytical and numerical results show that the proposed scheme is able to improve the throughput of SUs, and enlarge the transmission range of primary users (PUs) without increasing the number of hops. 展开更多
关键词 decode-and-forward (df Triple-hop Cognitive relay networks (CRNs) Time and power allocation Superpositioncoding
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