2 results listed
In this paper, performance of joint transmit and receive antenna selection in cooperative MIMO channels is investigated over Rayleigh fading environments. A cooperative MIMO communication scenario in which all of the terminals are equipped with multiple antennas is considered where source want to transmit data to the destination with the help of the relay. The techniques developed in literature to combat error propagation effect in digital relaying networks such as cooperative maximal ratio combining (C-MRC), virtual noise (VN) based detection and selective relaying (SR) are exploited in this study to obtain new antenna selection criteria for cooperative MIMO systems. Only one antenna is selected and activated at each of the three terminals in a manner to minimize the end-to-end bit error rate (BER) of the overall system. This approach eliminates the requirement of space-time signaling in system design and reduces the complexity and cost by minimizing the number of the required RF chains in the network. Unlike most of the studies in the literature, we assume that the direct link between source and destination exists. Numerical results have shown that a diversity order of (nS + nR) * nD can be achieved for VN and SR based transmissions where nS, nR, and nD are the total number of the antennas at the source, relay and destination, respectively. Among the considered schemes, the best performance is obtained in case of SR based system model.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
Ozgur Ozdemir
Network coding has emerged as a paradigm for communication systems in which each intermediate node in the network generates and transmits output data by encoding previously received packets in a manner to increase the bandwidth efficiency of the system. The multiple access relay channel (MARC) is one of the real-world reference network coded communication scenarios where multiple users transmit data to a common destination through the use of one or multiple relays. In this paper, performance of demodulate and forward protocol which is among the prominent digital relaying techniques is considered in MARC systems. A convolutional code is used as the channel code. Maximum likelihood (ML) detection and user selective relaying are utilized in order to decrease the performance degradation due to decision errors at the relay. The simulation results obtained for Rayleigh fading channels have shown that the examined joint channel-network coding approach is superior with respect to non-cooperative system by providing full diversity gain.
International Conference on Advanced Technologies, Computer Engineering and Science
ICATCES
Ozgur Ozdemir