An iterative detection algorithm for coded CPFSK signals with irrational modulation index
作者： Wolfgang Gerstacker , Wolfgang Koch , Shahram Zarei , Gerd Kilian
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摘要: An algorithm for iterative demodulation and decoding of convolutionally coded interleaved Continuous Phase Frequency Shift Keying (CPFSK) signals with an irrational modulation index is presented. The based on integrating the Per-Survivor Processing (PSP) technique into a Soft-Input Soft-Output (SISO) CPFSK demodulator. Using PSP, phase offsets emerging from difference between transmit employed rational receive are estimated within PSP-SISO at each state in time step. These taken account to calculate soft information. information then refined during several iterations used estimate symbols. Simulations have shown that only five trellis states after four iterations, proposed performs BER=10−5 0.5 dB worse than quasi-exact which has sixteen states. This enables significant reduction computational complexity terms number
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