Open AccessImproving performance of the asynchronous cooperative relay networks with maximum ratio combining and transmit antenna selection technique
Author(s) -
Tran The Nghiep
Publication year - 2017
Publication title -
tạp chí khoa học đại học quốc gia hà nội: công nghệ thông tin - truyền thông (vnu journal of science: computer science and communication engineering)
Language(s) - English
Resource type - Journals
eISSN - 2615-9260
pISSN - 2588-1086
DOI - 10.25073/2588-1086/vnucsce.143
Subject(s) - relay , node (physics) , computer science , maximal ratio combining , transmission (telecommunications) , antenna (radio) , asynchronous communication , diversity gain , interference (communication) , cooperative diversity , computer network , space–time block code , topology (electrical circuits) , electronic engineering , mimo , telecommunications , beamforming , fading , engineering , electrical engineering , power (physics) , physics , acoustics , channel (broadcasting) , quantum mechanics
In this paper, a new amplify and forward (AF) asynchronous cooperative relay networks using maximum ratio combining (MRC) and transmit antenna selection (TAS) technique is considered. In order to obtain a maximal received diversity gain, the received signal vectors of all antennas of the each relay node are jointly combined by MRC technique in the first phase. Then, only one the selected antenna of each relay will amplify and retransmit the resulting MRC signal vectors to the destination node in the second transmission step of network. The proposed scheme not only offers to reduce the interference components induced by inter-symbol interference (ISI) among the relay nodes, but also can effectively remove them with employment near-optimum detection (NOD) at the destination node as compared with the previous distributed close loop extended-orthogonal space time block code (DCL EO-STBC) scheme. The analysis and simulation results confirm that the new scheme outperforms the previous cooperative relay networks in both synchronous and asynchronous conditions. Moreover, the proposed scheme allows to reduce the requirement of the Radio-Frequency (RF) chains at the relay nodes and is extended to general multi-antenna relay network without decreasing transmission rate.