Space-Time Block Coding for Wireless Communications

Power-line communication (PLC) has been recognized as a promising alternative communication technology due to the universal existence of power lines. However, signal transmitted through PLC channel suffers from severe inter-symbol interference (ISI) and strong impulsive noise (IN), degrading the reliability of data transmission. Although multicarrier orthogonal frequency-division multiplexing (OFDM) has been investigated to combat ISI in PLC, the inherent large peak-to-average power ratio (PAPR) of OFDM signal makes IN detection very difficult, and the OFDM based PLC system may not be the best choice under hostile PLC channels. To combat both ISI and IN, we propose a low complexity scheme based on single-carrier frequency-domain turbo equalization (SC-FDTE) coupled with iterative IN mitigation. Simulation results indicate that, the proposed scheme is able to efficiently mitigate IN in the PLC channel and outperforms the joint clipping and blanking approach for IN mitigation.

/pdf/frequency-domain-turbo-equalization-with-iterative-impulsive-adah61uf8t.pdf

Frequency-Domain Turbo Equalization with Iterative Impulsive Noise Mitigation for Single-Carrier Power-Line Communications

In this study, we carry out theoretical analysis combined with computer simulations for performance comparisons between uncoded orthogonal frequency division multiplexing (OFDM) and single-carrier frequency-domain equalization (SC-FDE) systems on frequency-selective static channels as well as frequency-selective fading channels. We consider both zero-forcing and minimum mean square error equalizations for data detection. Theoretical evaluations for output signal-to-noise ratio and error rate performance are presented for both OFDM and SC-FDE systems. Then, error rate bounds for both systems are derived. Combining all the analytical results with computer simulations, we reach certain important conclusions on the superiority between OFDM and SC-FDE systems.

Hong-Yu Liu

Papers

Comparative Performance Analysis of Uncoded OFDM and SC-FDE Systems