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Concatenation is a method of building long codes out of shorter ones, itattempts to meet the problem of decoding complexity by breaking the requiredcomputation into manageable segments. Concatenated Continuous Phase FrequencyShift Keying (CPFSK) facilitates powerful error correction. CPFSK also has theadvantage of being bandwidth efficient and compatible with nonlinearamplifiers. Bandwidth efficient concatenated coded modulation schemes weredesigned for communication over Additive White Gaussian noise (AWGN), andRayleigh fading channels. An analytical bounds on the performance of serialconcatenated convolutional codes (SCCC), and parallel concatenatedconvolutionalcodes (PCCC), were derived as a base of comparison with the thirdcategory known as hybrid concatenated trellis codes scheme (HCTC). An upperbound to the average maximum-likelihood bit error probability of the threeschemes were obtained. Design rules for the parallel, outer, and inner codesthat maximize the interleaver's gain were discussed. Finally, a low complexityiterative decoding algorithm that yields a better performance is proposed.

Performance of Hybrid Concatenated Trellis Codes CPFSK with Iterative Decoding over Fading Channels