Precoding Aided Iterative FDE for Reduced CP Single-Carrier Block Transmission Systems

Single-carrier block transmission systems with frequency domain equalization (FDE) suffers from power and bandwidth efficiency loss due to the cyclic extension. Conventional schemes to reduce the cyclic extension needed rely heavily on Turbo architecture which has much higher computational complexity. To make good compromise between performance and complexity, we proposed a precoding aided iterative FDE technique with reduced-length cyclic extensions. We emphasized that the proposed scheme effectively redistributes the dominant part of residual distortion and ensures reliable symbol estimate, which is superior to the conventional non-Turbo schemes. Low complexity algorithms are presented for computing key parameters and corresponding FDE filters. Simulation results confirmed the effectiveness of the proposed scheme for both uncoded and coded systems, which achieves a bandwidth efficiency increase of 29.4% and a power efficiency gain of 1.12dB, in the Hiperlan2/E system settings.