The Layered Receiver Employing Whitening Process for Multiple Space-Time Codes in Fast Flat Fading Channels

摘要

The multiple space-time trellis codes (M-STTC) structure is one of the Multiple Input Multiple output (MIMO) schemes providing high transmission rate and diversity and coding gain without bandwidth expansion. In this paper, an M-STTC system is proposed wherein the transmitter employs a multiple space-time TCM for the fast fading channel and the receiver has a decoding order block, several whitening processors, STTC decoders, and interference cancellers. The proposed layered receiver adopts a whitening process instead of a minimum mean squared error (MMSE) estimator, which is widely used in the BLAST type receiver. An optimum decoding order scheme is also planned since it gives at least a 2 dB gain in the proposed system in the fast flat Rayleigh fading channel of f_dT_c = 1/3 at the PER of 10~(-2). For an M-STTC system employing two STTCs with four transmit and receive antennas, the layered receiver with whitening process obtains a 5dB gain over the coded layered space-time processing in the fast flat Rayleigh fading channel at the FER of 10~(-2).