Article
VariableRate TwoPhase Collaborative Communication Protocols for Wireless Networks
Dept. of Electr. & Comput. Eng., Yokohama Nat. Univ.
IEEE Transactions on Information Theory (Impact Factor: 2.62). 10/2006; DOI: 10.1109/TIT.2006.880055 Source: IEEE Xplore

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ABSTRACT: In this paper, we investigate the performance of a cooperative orthogonal frequencydivision multipleaccess (OFDMA) system with decodeandforward (DaF) relaying. Specifically, we derive a closedform approximate symbolerrorrate expression and analyze the achievable diversity orders. Depending on the relay location, a diversity order up to $(L_{S_{k}D} + hbox{1}) +break sum_{m = 1}^{M}min(L_{S_{k}R_{m}} + hbox{1}, L_{R_{m}D} + hbox{1})$ is available, where $M$ is the number of relays, and $L_{S_{k}D} + hbox{1}$, $L_{S_{k}R_{m}} + hbox{1}$, and $L_{R_{m}D} + hbox{1}$ are the lengths of channel impulse responses of sourcetodestination, sourceto $m$th relay, and $m$th relaytodestination links, respectively. Monte Carlo simulation results are also presented to confirm the analytical findings.IEEE Transactions on Vehicular Technology 06/2014; 63(5):22162223. · 2.06 Impact Factor 
Conference Paper: Joint time offset and fading channel coefficient estimation for cooperative communication systems
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ABSTRACT: In this paper, we investigate joint channel gain and time offset estimation for two different data aided methods in cooperative communication with amplifyandforward (AF) relaying. First one is the Cascaded Estimation (CE) method which channel gain, and time offset consisting of both sourcetorelay, and relaytodestination links are estimated at the destination terminal, second one is Disintegrated Estimation (DE) method which channel gain, and time offset are estimated seperately at the relay for sourcetorelay link, and at the destination for relaytodestination link. Both of the proposed joint estimators are based on ExpectationMaximization (EM) algorithm and, produce a lowcomplexity solution of itaretive maximum likelihood (ML) estimation. It was observed by the bit error rate (BER) curves, the proposed methods provide good performances with lowcomplexity.Signal Processing and Communications Applications Conference (SIU), 2013 21st; 01/2013  [Show abstract] [Hide abstract]
ABSTRACT: We propose a coded cooperative relaying scheme in which only newly generated parity bits of users are multiplexed, spacetime block coded, and forwarded simultaneously by a multiantenna relay to a common multiantenna destination if the relay successfully decodes their information in order to improve bandwidth efficiency. Multiplexing introduces correlation between users’ data, which offers effectively longer codes and facilitates highperformance iterative multiuser decoding at the destination. Additionally, spacetime block coding makes bitmetrics calculation simple and increases spatial diversity of the received signal. Simulation results show that the proposed scheme significantly outperforms direct transmission under the same transmit power and bandwidth efficiency.Signal Processing 10/2009; 89(10). · 2.24 Impact Factor
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