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Title: On space-time trellis codes over rapid fading channels with channel estimation
Authors: LI YAN
Keywords: space-time coding, channel estimation, ML receiver, performance analysis, code design, transmit power allocation.
Issue Date: 4-May-2007
Source: LI YAN (2007-05-04). On space-time trellis codes over rapid fading channels with channel estimation. ScholarBank@NUS Repository.
Abstract: Space-time trellis codes (STTC) provide a promising technique to offer high data rates and reliable transmissions in wireless communications. Although most researches on STTC assume that perfect channel state information (CSI) is available at the receiver, this assumption is difficult and maybe impossible to realize in practice due to the time-varying characteristic of wireless channels. In this thesis, we first examine the receiver structure and performance of linear STTC over rapid, nonselective, Rayleigh fading channels with channel estimation. The time-varying multiple-input multiple-output channels are estimated by a pilot-symbol-assisted-modulation scheme. The maximum likelihood (ML) receiver structure with imperfect channel estimation is derived. New results for the pair-wise error probability and the bit error probability are obtained for the receiver. Based on the performance analysis results obtained, a new code design criterion is proposed. The key feature of our proposed criterion is the incorporation of the statistical information of the channel estimates. Therefore, the codes designed using this criterion are more robust to channel estimation errors. To reduce the complexity of code search, an iterative code search algorithm is proposed. New STTC obtained via the search algorithm can work better than existing codes even when there exist channel estimation errors. Finally, we study the closed-loop system with side information at the transmitter. A new lower bound on the capacity with imperfect CSI at both the transmitter and receiver is derived. Several optimal transmit power allocation schemes based on the information known at the transmitter are proposed.
Appears in Collections:Ph.D Theses (Open)

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