Abstract
It has been shown that when perfect or partial channel state information (CSI) is available at the transmitter, the performance and capacity of a space–time coded system can be further improved. Multilevel space–time trellis codes (MLSTTC’s) are capable of simultaneously providing bandwidth efficiency, diversity improvement and coding gain with significantly reduced decoding complexity, especially for larger constellations and higher throughputs. In this paper, we present a design of combined multilevel space–time trellis codes and beam forming based on feedback from receiver, henceforth referred to as weighted multilevel space–time trellis codes (WMLSTTCs). The channel profile is used to provide a beam forming scheme that achieves the better performance by properly weighting transmitted signals. Weights are selected that matches best with a channel profile feedback from the receiver indicative of long-term characteristics of the wireless channel. WMLSTTCs provide improvement in performance of MLSTTCs.
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