Adaptive multidimensional coded modulation over flat fading channels

被引：185

作者：

Hole, KJ ^{[1
]}

Holm, H

Oien, GE

机构：

[1] Univ Bergen, Dept Informat, HiB, N-5020 Bergen, Norway

[2] Norwegian Univ Sci & Technol, Dept Telecommun, N-7491 Trondheim, Norway

来源：

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS | 2000年 / 18卷 / 07期

关键词：

adaptive trellis coding; link spectral efficiency; Nakagami multipath fading;

D O I：

10.1109/49.857915

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We introduce a general adaptive coding scheme for Nakagami multipath fading channels. An instance of the coding scheme utilizes a set of al-dimensional (2L-D) trellis codes originally designed for additive white Gaussian noise (AWGN) channels. Any set of 2L-D trellis codes for AWGN channels can be used. Sets for which all codes can be generated by the same encoder and decoded by the same decoder are of particular interest. A feedback channel between the transmitter and receiver makes it possible to transmit at high spectral efficiencies under favorable channel conditions and respond to channel degradation through a smooth reduction of the spectral efficiency. We develop a general technique to determine the average spectral efficiency of the coding scheme for any set of 2L-D trellis codes. As an illustrative example, we calculate the average spectral efficiency of an adaptive codec utilizing eight 4-D trellis codes. The example codec is based on the International Telecommunications Union's ITU-T V.34 modem standard.

引用

页码：1153 / 1158

页数：6

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