Iteratively decoded variable length space-time coded modulation: Code construction and convergence analysis

作者：Ng Soon Xin^*; Wang Jin; Tao Meixia; Yang Lie Liang; Hanzo Lajos

来源：IEEE Transactions on Wireless Communications, 2007, 6(5): 1953-1963.

DOI：10.1109/TWC.2007.05698

• EXIT charts
• iterative decoding
• MIMO
• STTC
• VLC

An Iteratively Decoded Variable Length Space Time Coded Modulation (VL-STCM-ID) scheme capable of simultaneously providing both coding and iteration gain as well as multiplexing and diversity gain is proposed. Non-binary unity-rate precoders are employed for assisting the iterative decoding of the VL-STCM-ID scheme. The discrete-valued source symbols are first encoded into variable-length codewords that are mapped to the spatial and temporal domains. Then the variable-length codewords are interleaved and fed to the precoder assisted modulator. More explicitly, the proposed VL-STCM-ID arrangement is a jointly designed iteratively decoded scheme combining source coding, channel coding, modulation as well as spatial diversity/multiplexing. As expected, the higher the source correlation, the higher the achievable performance gain of the scheme becomes. Furthermore, the performance of the VL-STCM-ID scheme is about 14.6 dB better than that of the Fixed Length STCM (FL-STCM) benchmarker at a source symbol error ratio of 10(-4).

• 出版日期2007-5