Title :
Adaptive coded modulation for fading channels
Author :
Chua, Soon Ghee ; Goldsmith, Andrea
Author_Institution :
Stanford Univ., CA, USA
Abstract :
We propose a variable-power and variable-rate coded MQAM modulation technique for high-speed data transmission on fading channels. Coding gain is obtained by superimposing trellis codes designed for AWGN channels on the adaptive modulation, and we obtain the same coding gains as these codes exhibit in AWGN. We present analytical and simulation results which show a 3dB coding gain relative to uncoded adaptive modulation for a simple 4-state trellis code, and a 4 dB coding gain for an 8-state trellis code. More complex trellis codes achieve higher gains
Keywords :
adaptive codes; data communication; fading; land mobile radio; quadrature amplitude modulation; trellis coded modulation; variable rate codes; 8-state trellis code; AWGN channels; adaptive coded modulation; coding gain; fading channels; high-speed data transmission; simple 4-state trellis code; simulation; trellis codes; variable-power coded MQAM modulation technique; variable-rate coded MQAM modulation technique; AWGN channels; Analytical models; Bandwidth; Bit error rate; Convolution; Convolutional codes; Data systems; Fading; Modulation coding; Robustness;
Conference_Titel :
Communications, 1997. ICC '97 Montreal, Towards the Knowledge Millennium. 1997 IEEE International Conference on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3925-8
DOI :
10.1109/ICC.1997.595036
