The CPFSK dual-mode error correction decoding technique over the burst-error channel

This paper presents an error correcting adaptive decoding dual-mode algorithm as it is adapted to the continuous phase frequency shift keying (CPFSK) modulation. The dual-mode error correcting algorithm consists of two modes which utilizes the maximum likelihood decoding technique and the burst-error detection scheme. The first mode is the random error correcting mode, which is the Viterbi decoder, and the second mode is the burst-error correcting mode that retrieves the information bits from the (L+m) delayed signal values of the received signals. The dual-mode adaptive decoder nominally operates as a Viterbi decoder and switches to time diversity error recovery, the burst-error correcting mode, whenever the decoder detects an incorrigible error pattern. The experimental results from the computer simulation demonstrate the performance of the algorithm and verify the theoretical results.