Conference Paper

Optimized symbol mapping for bit-interleaved coded modulation with iterative decoding

Sch. of Inf. Eng., Commun. Univ. of China, Beijing
DOI: 10.1109/ICCT.2008.4716215 Conference: Communication Technology, 2008. ICCT 2008. 11th IEEE International Conference on
Source: IEEE Xplore

ABSTRACT Symbol mapping is very crucial for the performance of bit-interleaved coded modulation with iterative decoding (BICM-ID). In this paper, a new scheme of symbol mapping called Cross-8PSK-Quasi-Gray is proposed. The optimization scheme of Cross-8PSK is composed of two QPSK with different radius and phases. Through analysis and comparisons with three previously mentioned symbol mappings in terms of channel capacity and error performance, simulation results show that Cross-8PSK-Quasi-Gray mapping significantly outperforms set partitioning, semi set partitioning labeling maps in the aspects of both channel capacity and error performance. The overall performance of Cross-8PSK-Quasi-Gray mapping is nearly close to gray mapping in conventional 8PSK. Thus, Cross-8PSK-Quasi-Gray mapping is a good scheme for designing the power-efficient BICM.

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    • "It is obvious that for a crowded constellation, an exhaustive search to find a mapping that yields the smallest value of the cost function, is impossible due to the complexity. Therefore, Binary Switching Algorithm (BSA) [22] [19] is used to avoid long searches and infeasible complexity. "
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    ABSTRACT: In this paper, the design of constellation mapping for bit interleaved coded modulation systems with iterative decoding (BICM-ID) for multiple input multiple output (MIMO) channel is studied. Based on minimizing pair-wise error probability, a design criterion is proposed to find the optimal constellation mapping for a MIMO-BICM-ID system. Using the design criterion and employing the binary switching algorithm, some optimal constellation mappings are found for 2-dimensional and 3-dimensional cases. It is shown that proposed mapping schemes outperform conventional ones significantly at high Signal to Noise Ratio (SNR) over fading channels.
    Proceedings of IEEE International Conference on Communications, ICC 2008, Beijing, China, 19-23 May 2008; 01/2008
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    • "EXIT chart analysis was originally developed to investigate the behavior of concatenated (turbo) codes. In recent years, this method was extended to different challenges, e.g., iterative equalization [6] or iterative demodulation [7]. An approach to examine ICE within the EXIT chart framework can be found in [3], [8]. "
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    • "Nevertheless, in recent years this method was extended to different challenges, e.g., iterative equalization [6] or iterative demodulation [7]. An approach to examine ICE within the EXIT chart framework can be found in [8]. "
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    ABSTRACT: In this paper, we investigate a coded OFDM system employing an iterative receiver, which is a serial concatenation of an inner and outer component decoder. The inner component decoder includes pilot and data aided channel estimation (CE) and demodulation whereas the outer component decoder consists of the decoder. Between these two components extrinsic log- likelihood ratio values of the code bits are iterated to reduce the bit-error rate (BER) of the information bits. Besides BER plots and extrinsic information transfer (EXIT) charts, we investigate BER transfer (BERT) charts to analyze and predict the performance of the iterative receiver. I. I NTRODUCTION
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