Timing Synchronization with Turbo Codes on AWGN Chan- nels
نویسندگان
چکیده
This paper presents the behaviour of a turbo coding scheme when the symbol timing is not perfectly known. The algorithm for timing synchronization together with the theoretical Cramer Rao bound and the performance of an NDA ML synchronizer are presented. It is shown that synchronization can be achieved using the soft bit outputs of the turbo decoder without the need of using complex separate synchronizers prior to feeding the signal to the turbo decoder.
منابع مشابه
Joint Timing Synchronization and Decoding of Turbo Codes in AWGN
This paper presents the behaviour of a turbo coding scheme when the synchronization parameters are not perfectly known. The algorithm for timing synchronization together with the theoretical Cramer Rao bound and NDA ML synchronizer are presented. It is shown that synchronization can be achieved using soft bit output of the turbo decoder without the need of using complex separate synchronizers p...
متن کاملTiming and Phase Synchronization with Turbo Codes
The system performance analysis of turbo coded systems in wireless packet transmission applications usually assumes that the channel has been estimated and synchronization parameters are properly set. This paper discusses a realistic turbo coding system when the signal phase or timing offset have not been perfectly compensated. Its intention is to give an overview of the synchronization techniq...
متن کاملCode-aided Phase and Timing Ambiguity Resolution for AWGN Channels
We present a novel maximum-likelihood (ML) joint frame synchronization and carrier phase ambiguity resolution algorithm for coded systems that exploits the code properties by accepting soft information from the MAP decoder. Simulation results are presented for turbo codes, and are compared to performance results of a conventional algorithm that does not use the code properties. We show that cod...
متن کاملTiming error recovery in turbo-coded systems on AWGN channels
The classical method for decoding turbo codes is the Bahl–Cocke–Jelinek–Raviv (BCJR) algorithm which, in the majority of existing papers, is analyzed under the assumption of perfect channel knowledge and synchronization. In reality, however, its properties change significantly when synchronization is not ideal. In this paper, we show that the influence of timing synchronization offset can be mo...
متن کاملSynchronization of turbo codes based on online statistics
Turbo codes are sensitive to both (timing) synchronization errors and signal-to-noise ratio (SNR) mismatch. Since turbo codes are intended to be deployed in environments with very low SNR, conventional synchronization methods often fail. This paper introduces a solution for jointly estimating the SNR and achieving timing synchronization based on the statistics of the received signal. Simulation...
متن کامل