An Expectation-Maximization type receiver for uplink of a hopping system with time sharing

In this work, expectation-maximization type receiver for uplink of an MC-CDMA system based on a time sharing hopped communication technique is proposed in order to cope with the multipath fading effect in a wireless communication system. In the proposed time-sharing hopped communication method, managing mechanism determines each user channel quality knowledge by controlling the quality of the channels between users and it. In order to present a higher quality transmission for the users with low quality channels, managing mechanism gives an opportunity to them to send their message over the users with high quality channels in time sharing mode. Thus, transmission quality for the users with low quality channel is improved. The performance of the proposed receiver, with/without hopping and with cooperative communication technique, is analysed for multipath flat fading channels by computer simulation, and results are presented.