A joint pilot assisted and despread soft-output carrier synchronization for burst DSSS system
- 1 May 2012
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
Current carrier synchronization algorithms at extremely low signal to noise ratios (SNRs) for burst direct sequence spread spectrum (DSSS) communication systems are not very well at achieving high estimation precision and wide estimation range at the same time. An averaging periodogram (AP) and maximum mean square despread soft-output (M2SDSO) based joint pilot assisted and despread soft-output carrier synchronization algorithm (AP-M2SDSO) is proposed in this paper. In this algorithm, a frame structure in which pilot bits and data are arranged alternately is employed. First, with the help of pilot bits, a coarse frequency offset estimation is performed based on the AP method, and a coarse phase offset estimation is obtained with the maximum likelihood (ML) algorithm, then the phase of the received signals is compensated for each pair of pilot and data. Next, using despread soft-output, a fine frequency offset estimation is carried out based on the M2SDSO algorithm; then, the fine phase offset estimation is obtained. Simulation results show that at extremely low SNRs the performance of AP-M2SDSO algorithm is near the modified Cramer-Rao bound (MCRB) with high frequency offset estimation precision and wide frequency offset and phase offset estimation ranges. The bit error rate of the AP-M2SDSO algorithm is near the BER performance of ideal synchronization.Keywords
This publication has 6 references indexed in Scilit:
- A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC CodeJournal of Electronics & Information Technology, 2011
- A new method for carrier phase synchronization and decoding in turbo-coded systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010
- ML iterative soft-decision-directed (ML-ISDD): a carrier synchronization system for short packet turbo coded communicationIEEE Transactions on Communications, 2008
- Maximum-mean-square soft-output (M2S2O): a method for carrier synchronisation of short burst turbo coded signalsIEE Proceedings - Communications, 2006
- A simple interpolation technique for the dft for joint system parameters estimation in burst mpsk transmissionsIEEE Transactions on Communications, 2003
- Synchronization Techniques for Digital ReceiversPublished by Springer Science and Business Media LLC ,1997