TRELLIS-CODED, TYPE-I HYBRID-ARQ PROTOCOLS BASED ON CRC ERROR-DETECTING CODES

A trellis-coded, type-I hybrid-ARQ protocol using CRC codes as the err or-detecting mechanism is described and analyzed. Bounds on both the r eliability and throughput performance of the resulting error control s cheme are derived for AWGN channels and slowly fading Rician channels. Examples are included to illustrate the achievable gain of the propos ed system relative to ordinary FEC trellis-coded systems. For slowly f ading Rician channels, hybrid-ARQ protocols based on ordinary trellis- coded modulation and multiple trellis-coded modulation are also compar ed. All analytical results are supported by data from a series of simu lations.