Low-Complexity Iterative Detection for Spectral Efficient Cooperative Transmission

This paper proposes a low-complexity iterative detection scheme with cooperative transmission for single-carrier frequency-domain equalization (SC-FDE). To increase the spectral efficiency, a node, which acts as a relay, simultaneously transmits its own data block and the data block from the other node. For user separation, each data block is interleaved by a user-specific interleaver. At the destination, linear combining is performed and then the interference from the other source is effectively removed by an iterative detection method in the frequency domain. Simulation results show that the proposed system can obtain diversity gain without sacrificing spectral efficiency and approaches the performance of iterative maximum a posteriori (MAP) equalization at low computational cost.