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Performance of Space-Time Trellis Codes with Minimum Hamming Distance Mapping on Fast Fading Channels  

Jin, Ik-Soo (경남대학교 정보통신공학과)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.9, no.2, 2010 , pp. 96-103 More about this Journal
Abstract
This paper studies the performance of STTC with minimum Hamming distance (MHD) mapping in order to improve the bit error rate (BER) performance. Unfortunately, the MHD mapping used in trellis coded modulation (TCM) or multiple trellis coded modulation (MTCM) cannot be directly applied to STTC because the trellis structure of STTC is generally different from that of TCM or MTCM. Therefore, we need a simple modification to apply the MHD mapping concept in STTC. The core of the modification assigns information bits with a Hamming distance in proportion to the sum of the Euclidean distance to trellis branch of STTC. To the best knowledge, this combination has not been considered yet. The BER performance is examined with simulations and the performance of MHD mapping is compared to that of well known natural mapping and Gray mapping on both fast Rayleigh as well as fast Rician fading channels. It is shown that the performance of MHD mapping is much better than that of natural mapping or Gray mapping over fast Rician fading channels, especially.
Keywords
STTC; MHD; TCM; MTCM; gray; hamming distance;
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