Side information for noncoherent FH-SS DPSK in partial-band jamming

A side information generating algorithm for iterative decoding in frequency-hopping spread-spectrum (FH-SS) is proposed. In the algorithm, the channel state probabilities are iteratively calculated with an extension of the Kang-Stark algorithm. Differential encoded phase shift keying (DPSK) is employed with the noncoherent expanded trellis based iterative receiver. The performance of the proposed algorithm with the convolutionally coded system is evaluated by simulation and compared with a system using a ratio threshold test (RTT) for PSK. The results show that the performance of the introduced algorithm is similar to the system with perfect jamming state information and provides better side information than RTT.