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A new space-time multiple trellis coded modulation scheme for flat fading channels

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2004年第3期E87A卷 640-648页

作者： Jiang, S Kohno, R Yokohama Natl Univ Div Elect & Comp Engn Fac Engn Yokohama Kanagawa 2408501 Japan

Recently, space-time multiple trellis coded modulation (ST-MTCM) has been introduced in order to achieve maximum transmit diversity gain and larger coding gain with the existance of parallel paths, which can not be achieved with STTCM system. In order to achieve good performance, it is crucial to maximize the intra-distance, which is defined by parallel paths and determine the performance. Conventional ST-MTCM uses a generator matrix G for coded modulation;however, we find that no matrix can be designed which can maximize the intra-distance by computer search. In this paper, we focus on maximizing the intra-distance and the diversity gain, and hence design a new coded modulation scheme. We use trellis codes in this paper which cannot be described by a matrix G. The proposed codes can achieve the maximum intra-distance and thus good coding gain, which may not be achieved by conventional codes. We also show that the proposed code can achieve good performance both in quasi-static and fast flat fading channels without the need for changing the codes as is necessary in the conventional ST-MTCM scheme.

关键词： space-time multiple trellis coded modulation diversity convolutional code Viterbi decoding intra-distance

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A new space-time multiple trellis coded modulation scheme using transmit symbol phase rotation

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WIRELESS PERSONAL COMMUNICATIONS 2005年第1-2期35卷 153-171页

作者： Jiang, SS Kohno, R Yokohama Natl Univ Grad Sch Engn Div Phys Hodogaya Ku Yokohama Kanagawa 2408501 Japan

space-time multiple trellis coded modulation (ST-MTCM) has been introduced in order to achieve maximum transmit diversity gain and larger coding gain with the existence of parallel paths. In our previous research, we designed a new coded modulation scheme for ST-MTCM which simultaneously maximizes the coding gain and diversity gain utilizing Hadamard Matrix giving the maximum determinant. This scheme, however, cannot achieve full transmit rate. In this paper, we extend our research so as to achieve full rate transmission as well as maximum coding and diversity gain. In addition, Super-Orthogonal space-time trellis Code (SO-STTC) is well known for its high coding gain, full diversity gain and full transmit rate. Even though our proposed scheme is essentially the same as SO-STTC, we show in this paper that our proposed code design is different from SO-STTC, and achieves better performance. Our proposed code design utilizes transmit symbol phase rotation at a certain time slot so as to avoid same path transition in trellis, which occurs with conventional SO-STTC scheme. We design codes with different way of phase rotation for different MPSK modulation scheme, and simulation results show the improvements of our proposed codes for MPSK modulation with different number of states.

关键词： space-time multiple trellis coded modulation super-orthogonal space-time trellis codes set partitioning transmit diversity symbol phase rotation catastrophic code

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A new space-time multiple trellis coded modulation scheme using transmit symbol phase rotation

A new space-time multiple trellis coded modulation scheme us...

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International Symposium on Wireless Personal Multimedia Communications

作者： Jiang, SS Kohno, R Yokohama Natl Univ Grad Sch Engn Div Phys Hodogaya Ku Yokohama Kanagawa 2408501 Japan

关键词： space-time multiple trellis coded modulation super-orthogonal space-time trellis codes set partitioning transmit diversity symbol phase rotation catastrophic code

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