Subcarrier analysis power allocation for multiuser in cooperative communication using MIMO-OFDM

Abstract

The reduction of power consumption in co-operative multiuser OFDMA systems is a great challenge in multipath environment.  The power distribution among multi users in relay path has more complexity compared with direct path. Particular subcarrier resource allocation approach that is of interest in this paper is a method based on nodes that transmit and receive on adjacent OFDM subcarriers simultaneously. This approach has shown significant promise, but its feasibility has not been fully investigated. In particular there will be a performance trade off in realistic systems as adjacent subcarriers will not be completely isolated and there will be interference on the receiving subcarriers that are adjacent to those that are transmitting. In this paper we look into the performance of such cooperative OFDMA systems under realistic conditions and relay path of cooperative communication on difference modulation on 16QAM ;64QAM;128QAM AND 256QAM using power consumptions so we propose a transceiver structure to reduce the interference between transmitting subcarriers and receiving subcarriers. . For that purpose, we will introduce a transceiver structure to reduce the interference between adjacent subcarriers. Its performance in terms of signal to interference and noise ratio (SINR) is evaluated by both analysis and simulation and is incorporated into a recently proposed cooperation strategy for OFDMA systems to examine its performance under the realistic structure.