A new method of carrier phase recovery for BPSK system using turbo-codes over AWGN channel

Abstract

A new method of carrier phase recovery is implemented with the assistance of the extrinsic information from the turbo decoder. BPSK systems using turbo-codes over an AWGN channel with unknown phase are investigated. The phase recovery and turbo-decoding is implemented jointly and iteratively. The phase error can be corrected up to 82/spl deg/. The decoding can be made robust against phase uncertainty. The results show that this joint method gives a great improvement over the traditional techniques, which implement separate synchronisation prior to feeding the signal to the decoder. A further improvement of this method is also proposed, which can remove most of the phase errors completely or recover any phase error over 2/spl pi/ although it sacrifices some performance.