Impact Of Channel Estimation Error On The Single-carrier Joint Tx/Rx MMSE-FDE

Abstract—In this paper, we discuss how the channel estimation (CE) error affects the bit error rate (BER) performance of singlecarrier (SC) block transmission using a previously proposed joint transmit/receive (Tx/Rx) frequency-domain equalization (FDE). First, the set of FDE weights is derived based on the minimum mean square error (MMSE) criterion by taking into account the CE error. The CE error is approximated as a zero-mean complex random Gaussian variable. We show by computer simulation that the proposed joint Tx/Rx MMSE-FDE is robust against the CE error. We consider pilot-assisted channel estimation (PACE) for joint Tx/Rx MMSE-FDE. A first order linear interpolation and extrapolation are introduced to achieve higher tracking ability against the time-variation of the channel gain. We discuss the impact of normalized Doppler frequency on the BER performance.