Title :
A New Low Complexity Iterative Detection for Space-Time Bit-Interleaved Coded Modulation Schemes
Author :
Li, Ying ; Xie, Hongmei ; Guo, Xudong ; Wang, Xinmei
Author_Institution :
Xidian Univ., Xi´´an
Abstract :
To reduce the detection complexity of the space-time bit-interleaved coded modulation(ST-BICM) scheme, a turbo type iterative receiver structure consisting of a new group Gaussian approximation(GGA) algorithm and an a posteriori probability(APP) decoder is presented. When calculating the log-likelihood ratio(LLR) of the i-th transmitted symbol, the GGA algorithm first divide the N transmitted signals into two groups, a detecting group consisting of G signals with the i-th transmitted signal included, and an interfering group consisting of the other N-G signals. Taking the superposition of the N-G signals as a Gaussian random variable, the GGA algorithm implements the maximum a posteriori(MAP) detection to obtain the LLR of the signal transmitted from antenna i. At high SNR values or if the receiver has more than two replicas of each transmitted signal, the GGA detection exhibits a good performance as well as low decoding complexity.
Keywords :
Gaussian processes; interleaved codes; iterative methods; maximum likelihood detection; modulation coding; space-time codes; turbo codes; GGA algorithm; Gaussian random variable; N-G signals; ST-BICM scheme; a posteriori probability decoder; group Gaussian approximation algorithm; i-th transmitted signal; log-likelihood ratio; low complexity iterative detection; maximum a posteriori detection; space-time bit-interleaved coded modulation schemes; turbo type iterative receiver structure; Decoding; Detectors; Interleaved codes; Iterative algorithms; Modulation coding; Quantum computing; Random variables; Signal detection; Signal processing; Transmitting antennas; Group Gaussian Approximation; Iterative Decoding; Maximum a Posteriori; ST-BICM;
Conference_Titel :
Advanced Information Networking and Applications, 2008. AINA 2008. 22nd International Conference on
Conference_Location :
Okinawa
Print_ISBN :
978-0-7695-3095-6
DOI :
10.1109/AINA.2008.64