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Quasi-Orthogonal STBC with Iterative Decoding in Bit Interleaved Coded Modulation  

Sung, Chang-Kyung (삼성전자)
Kim, Ji-Hoon (고려대학교 전기전자전파공학부 무선통신연구실)
Lee, In-Kyu (고려대학교 전기전자전파공학부 무선통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.4A, 2008 , pp. 426-433 More about this Journal
Abstract
In this paper, we present a method to improve the performance of the four transmit antenna quasi-orthogonal space-time block code (STBC) in the coded system. For the four transmit antenna case, the quasi-orthogonal STBC consists of two symbol groups which are orthogonal to each other, but intra group symbols are not. In uncoded system with the matched filter detection, constellation rotation can improve the performance. However, in coded systems, its gain is absorbed by the coding gain especially for lower rate code. We propose an iterative decoding method to improve the performance of quasi-orthogonal codes in coded systems. With conventional quasi-orthogonal STBC detection, the joint ML detection can be improved by iterative processing between the demapper and the decoder. Simulation results shows that the performance improvement is about 2dB at 1% frame error rate.
Keywords
Iterative Decoding; Quasi-Orthogonal Space-Time Block Coding (STBC); Multi-Input Multi-Output (MIMO) and Bit-Interleaved Coded Modulation (BICM);
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