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An interference immunity decoding method for multicarrier trellis-coded SFH/16QAM

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 1999年第11期82卷 8-18页

作者： Shinoi, K Saba, T Sasase, I Keio Univ Dept Elect Engn Yokohama Kanagawa 2238522 Japan Chiba Inst Technol Dept Comp Sci Chiba 2750016 Japan

Multicarrier trellis-coded modulation is known to be effective in land mobile delay-sensitive speech communications, since it can achieve frequency diversity by multicarrier and trellis coding without interleaving. Recently, multicarrier trellis-coded 8PSK using frequency hopping (FH) has been proposed to reduce the fading correlation of the received signal and increase the error correction capability of multicarrier trellis-coded systems. In cellular communication systems, frequency reuse is employed to achieve good spectral efficiency, although it depends on the level of the cochannel interference (CCI). interference immunity decoding methods with interleaving based on randomizing the CCI levels and adjusting the minimum Euclidean distance according to the weighted value by using the estimated CCI level per symbol have been proposed. However, the use of interleaving may cause time delays. In this paper, we propose an interference immunity decoding method for multicarrier trellis-coded slow-FH/16QAM without using interleaving. In our proposed scheme, we estimate the CCI using space symbols inserted in several slots and modify the branch metric according to the weighted value by using the estimated CCI level per symbol. Multiple carriers using frequency hopping are employed to prevent excess time delay by randomizing the interference level without interleaving. The BER performance of the proposed decoding method is investigated by computer simulation. It is shown that the proposed decoding method is effective in suppressing the effects of CCI in fading channels. (C) 1999 Scripta Technica.

关键词： multicarrier trellis coding slow frequency hopping interference immunity decoding

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