Institute of Electrical & Electronic Engineers
In this paper, the authors propose a receiver using the concept of a "Virtual channel" and Turbo codes for Multi-User Multiple-Input Multiple-Output (MU-MIMO) systems with cooperating transmitters. In order to reduce feedback information from receivers, a pre-coding method with reduced Channel State Information (CSI) is needed. Although signals interfere with each other in such a system, the proposed receiver enables high-speed transmission by detecting signals iteratively. In the proposed iterative scheme, soft information is exchanged between virtual channel detectors and Turbo decoders to improve the Bit Error Rate (BER) performance. They evaluate the performance of the proposed receiver in systems with two transmitters, each equipped with four antennas, and two receivers, each equipped with two antennas.