Title :
A Low complexity Flexible Non-Data-Aided and Non-Time-Directed Frequency Synchronizer for QPSK Modulated Signals
Author :
Calvo, P.M. ; Sevillano, J.F. ; Velez, I. ; Irizar, A.
Author_Institution :
Dept. of Electron. & Commun., Navarra Univ., San Sebastian
Abstract :
This paper focuses on the estimation of large carrier frequency offsets in QPSK modulated signals. A common approach is based on searching for the maximum of a likelihood function. This search must be done operating over the same block of samples, in order to avoid a noisy likelihood curve that can lead to an erroneous estimate. We propose an efficient iterative algorithm that works with different blocks of data. This way, the need for memory is removed, and implementation costs are reduced. Additionally, the new algorithm can be adapted to the SNR in run-time
Keywords :
frequency estimation; iterative methods; maximum likelihood estimation; quadrature phase shift keying; QPSK modulated signals; SNR; carrier frequency offset estimation; iterative algorithm; low complexity flexible nondata-aided synchronizer; maximum likelihood function; nontime-directed frequency synchronizer; quadrature phase shift keying; signal-to-noise ratio; Costs; Frequency estimation; Frequency synchronization; Iterative algorithms; Matched filters; Quadrature phase shift keying; Robustness; Runtime; Satellite broadcasting; Timing;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660992
