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 WET  Vol.4 No.2 , April 2013
A New Improved Symbol Mapper/8-Ary Constellation for BICM-ID
Abstract: This contribution proposes a new combination symbol mapper/8-ary constellation, which is a joint optimization of an 8-ary signal constellation and its symbol mapping operation, to improve the performance of Bit Interleaved Coded Modulation with Iterative Decoding (BICM-ID). The basic idea was to use the so called (1,7) constellation (which is a capacitive efficient constellation) instead of the conventional 8-PSK constellation and to choose the most suitable mapping for it. A comparative study between the combinations most suitable mapping/(1,7) constellation and SSP mapping/conventional 8-PSK constellation has been carried out. Simulation results showed that the 1st combination significantly outperforms the 2nd combination and with only 4 iterations, it gives better performance than the 2nd combination with 8 iterations. A gain of 4 dB is given by iteration 4 of the 1st combination compared to iteration 8 of the 2nd combination at a BER level equal to 10-5, and it (iteration 4 of the 1st combination) can attain a BER equal to 10-7 for, only, a SNR = 5.6 dB.
Cite this paper: S. Benmahmoud and A. Djebbari, "A New Improved Symbol Mapper/8-Ary Constellation for BICM-ID," Wireless Engineering and Technology, Vol. 4 No. 2, 2013, pp. 65-70. doi: 10.4236/wet.2013.42010.
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