DocumentCode :
1952151
Title :
Low complexity time-frequency synchronization for transform domain communications systems
Author :
Gang Wu ; Su Hu ; Shaoqian Li
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Commun., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
fYear :
2015
fDate :
12-15 July 2015
Firstpage :
1002
Lastpage :
1006
Abstract :
As an overlay cognitive radio, transform domain communication system (TDCS) has been proposed to support reliable communications with low probability of interception. However, most of research on TDCS assume perfect synchronization to simplify algorithm design. In this paper, we present a low complexity symbol timing offset (STO) and carrier frequency offset (CFO) estimation method for practical TDCS applications. By utilizing preamble consisted of multiple identical training sequences, STO can be estimated by the demodulation procedure of cyclic code shift keying (CCSK), in which the circular correlation is performed by utilizing fast Fourier transform (FFT). Thus the estimation procedure is significantly simplified with considerable complexity reduction, which is analyzed and compared to other two conventional methods. The simulation results demonstrates that the proposed STO and CFO estimation scheme is a low complexity solution for TDCS in multipath Rayleigh fading channels with comparable estimation performance in terms of probability of incorrect timing offset and mean-square-error of CFO.
Keywords :
Rayleigh channels; cognitive radio; cyclic codes; demodulation; fast Fourier transforms; mean square error methods; multipath channels; time-frequency analysis; CCSK; CFO estimation method; FFT; STO; TDCS; carrier frequency offset; circular correlation; cyclic code shift keying; demodulation procedure; fast Fourier transform; low complexity time-frequency synchronization; mean-square-error; multipath Rayleigh fading channel; overlay cognitive radio; symbol timing offset; transform domain communication system; Communication systems; Complexity theory; Correlation; Estimation; Fading; Timing; Transforms; Cognitive radio; carrier frequency offset; synchronization; timing offset; transform domain communication system;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal and Information Processing (ChinaSIP), 2015 IEEE China Summit and International Conference on
Conference_Location :
Chengdu
Type :
conf
DOI :
10.1109/ChinaSIP.2015.7230555
Filename :
7230555
Link To Document :
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