Iterative Demodulation and Decoding of DPSK Modulated Turbo Codes over Rayleigh Fading Channels
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Abstract:
In this paper we propose a new method to implement turbo codes over fading channels by extending the idea of turbo DPSK [3] to include turbo outer codes. An analytical tool has been developed to estimate the performance of extended turbo DPSK. A simulation study shows that extended turbo DPSK performs worse than BPSK modulated turbo codes with coherent detection. The energy inefficiency of extended turbo DPSK results from a big energy gap between BPSK and DPSK modulation at low Es/No where turbo codes operate. Increasing the rate of the turbo code will actually reduce the loss in energy efficiency because higher rate turbo codes work at a relatively higher Es/No region where the energy gap between DPSK and BPSK shrinks. 1.
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