Space-Time Interleaved OFDM Systems in Impulsive Noise and Mobile Fading Channels

Abstract

A robust communication system in wireless propagation channels is desirable with an improved bit error rate (BER), specifically, in rapidly changing mobile channels with impulse noise (IN). In this paper, a 2x2 space-time conjugate cancellation (STCC) two-path transmission scheme combined with interleaved orthogonal frequency division multiplexing (IOFDM) system is proposed. Without coding, the interleave in IOFDM is for improving diversity. The STCC-IOFDM system features in the excellent inter-carrier interference (ICI) mitigation due to STCC in frequency selective mobile fading channels while the interleaving process introduces both time and frequency diversity to effectively combat IN. Simulations demonstrate that the proposed STCC-IOFDM systems are robust to various frequency selective environments, including when the IN exists in bad urban mobile channels.