A New Two-User Cooperative Transmission Scheme with Low-Complexity FDE in SC-FDMA Systems

A new two-user cooperative transmission scheme with low-complexity frequency-domain equalization (FDE) for single carrier frequency division multiple access (SC-FDMA) systems in localized subcarrier mapping mode is proposed for uplink wireless transmission in this paper. At the destination, each user´s information can be obtained with a simpler diversity combing and a lower-complexity FDE than existing schemes. In order to effectively utilize resource, the two users transmit their information using their own allocated transmission subcarriers. At the same time, they exchange information using each partner´s allocated transmission subcarriers, and complete one cooperative process in two time slots with amplify-and-forward (AF) cooperative method. The proposed scheme could achieve full cooperative diversity over frequency-selective fading channel without multiple transmit antennas adopted at the users. Monte Carlo simulation results verify that, with the same spectral efficiency, the proposed scheme could achieve performance gain by 2 dB than the distributed Alamouti-like space-time block codes (STBC) in cluster-based cooperative communication singlecarrier FDE (SC-FDE) systems.