Diversity-Multiplexing Tradeoff in ISI Channels

作者：Grokop Leonard H^*; Tse David N C

来源：IEEE Transactions on Information Theory, 2009, 55(1): 109-135.

DOI：10.1109/TIT.2008.2008120

• Decision feedback equalization (DFE)
• diversity-multiplexing tradeoff
• intersymbol interference (ISI)
• maximum-likelihood sequence estimation
• minimum mean-square-error (MMSE) equalization
• zero-forcing (ZF) equalization

The optimal diversity-multiplexing tradeoff curve for the intersymbol interference (ISI) channel is computed and various equalizers are analyzed using this performance metric. Maximum-likelihood signal decoding (MLSD) and decision feedback equalization (DFE) equalizers achieve the optimal tradeoff without coding, but zero forcing (ZF) and minimum mean-square-error (MMSE) equalizers do not. However if each transmission block is ended with a period of silence lasting the coherence time of the channel, both ZF and MMSE equalizers become diversity-multiplexing optimal. This suggests that the bulk of the performance gain obtained by replacing linear decoders with computationally intensive ones such as orthogonal frequency-division multiplexing (OFDM) or Viterbi, can be realized in much simpler fashion-with a small modification to the transmit scheme.

• 出版日期2009-1