A New Improved Symbol Mapper/8-Ary Constellation for BICM-ID
- 1 Telecommunications and Digital Signal Processing Laboratory, Djillali Liabes University, Sidi Bel-Abbes, Algeria; Department of Electronics Engineering, M’sila University, M’sila, Algeria
- 2 Telecommunications and Digital Signal Processing Laboratory, Djillali Liabes University, Sidi Bel-Abbes, Algeria
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 1 st combination significantly outperforms the 2 nd combination and with only 4 iterations, it gives better performance than the 2 nd combination with 8 iterations. A gain of 4 dB is given by iteration 4 of the 1 st combination compared to iteration 8 of the 2 nd combination at a BER level equal to 10 -5 , and it (iteration 4 of the 1 st combination) can attain a BER equal to 10 -7 for, only, a SNR = 5.6 dB.
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