Single-Carrier Frequency-Domain Equalization for Space-Time Coded Systems Over Multipath Channels

In this paper, we study various frequency-domain equalizers (FDE) for single-carrier space-time block coded transmissions over frequency-selective fading channels. The linear and decision feedback equalizers based on zero forcing (ZF) and minimum mean-square error (MMSE) criteria are considered. These methods offer different tradeoff in terms of performance and the a priori knowledge of the data and receiver noise statistics, which is discussed. Besides, we also consider the adaptive FDE based on some low-complexity block-wise recursive algorithms, which obviates the need for distinct channel estimation and realizes joint channel estimation and equalization. Performance of these FDE schemes are investigated by applying them to the EDGE system in the multipath fading environment. Simulation results demonstrate their effectiveness and also provide implications for selection of these FDE schemes in practice