Title :
An improved sampling frequency synchronous algorithm for OFDM system
Author :
Ma, Zhen-qiu ; Cui, Wei ; Gong, Xiao ; Wu, Si-Liang
Author_Institution :
Dept. of Electron. Eng., Beijing Inst. of Technol., Beijing
Abstract :
The frequency offset between the transmitter and the receiver would severely impact the performance of orthogonal frequency division multiplexing (OFDM) system and must be compensated. One of effective sampling frequency synchronous algorithms was proposed by H. Shafiee; however, when this original synchronous algorithm is used to the OFDM system with a large number of sub-carriers, the existence of residual phase rotation may badly degrade the performance of system. An improved sampling frequency synchronous algorithm is proposed in this paper. The novel algorithm presented here introduces the alphabeta filter to delete the residual phase rotation. The simulation results of applying this novel algorithm to China Mobile Digital Multimedia Broadcasting (CMMB) demonstrate that a 0.5 dB~1 dB performance gain can be obtained, compared with the original one.
Keywords :
4G mobile communication; OFDM modulation; China Mobile Digital Multimedia Broadcasting; OFDM system; fourth-generation mobile communication system; improved sampling frequency synchronous algorithm; orthogonal frequency division multiplexing system; residual phase rotation; Demodulation; Filters; Frequency conversion; Frequency domain analysis; Frequency estimation; Integrated circuit technology; OFDM; Sampling methods; Timing; Transmitters; αβ Filter; CMMB; OFDM; Sampling Frequency Synchronization;
Conference_Titel :
Signal Processing, 2008. ICSP 2008. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2178-7
Electronic_ISBN :
978-1-4244-2179-4
DOI :
10.1109/ICOSP.2008.4697487
