Integration of Adaptive Equalization and Trellis-Coded Modulation with Interleaving for Land Mobile Communications

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概要

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• Future digital land mobile communication, for a moving picture, requires more transmission speed and less bit error rate than the existing system does for speech. In the system, the intersymbol interference may not be ignored, because of higher transmission speed. An adaptive equalizer is necessary to cancel intersymbol interference. To achieve low bit error rate performance on the mobile radio channel, trellis-coded modulation with interleaving is necessary. This paper proposes an interleaved trellis-coded modulation scheme combined with a decision feedback type adaptive equalizer of high performance. The reliable symbol reconstructed in the trellis decoder is used as the feedback signal. To make equalizer be free from decoding delay, deinterleaving is effectively utilized. The branch metric, for trellis-coded modulation decoding, is calculated as terms of squared errors between a received signal and an expected signal by taking the reconstructed symbol and the impulse response estimated by the recursive least squares algorithm into account. The metric is constructed to have good discrimination performance to incorrect symbols even in non-minimum phase and to realize path diversity effect in a frequency selective fading channel. Computer simulation results are shown for several channel models. On a frequency selective fading channel, average bit error rate is less than 1/100 of that of the RLS-MLSE equalizer for f_dT_s = 1/1000 at average E_b/N_0 beyond 15 dB. Performance degradation due to equalization error is less than 1.8 dB. Performance is greatly improved by the effect of the reconstructed symbol feedback.

• 社団法人電子情報通信学会の論文
• 1995-08-25

著者

• Ogiwara Haruo

  Faculty Of Engineering Nagaoka University Of Technology

• Suzuki Yasunori

  Faculty Of Engineering Nagaoka Univer Sity Of Technology

• Ogiwara Haruo

  Faculty Of Electrical Engineering Nagaoka University Of Technology

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