Joint Carrier Frequency Offset Estimation and Compensation for Downlink Group-Orthogonal Multicarrier CDMA

Authors:
Wei Yang;Junying Liu;Changlong Xu;Shixin Cheng
Affiliations:
State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China 100876 and State Key Laboratory of Rail Traffic Control and Safety, ...;State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Blind Residual Carrier Frequency Offset and Timing Offset Estimation Using Improved Minimum Output Variance Approaches in Uplink MC-CDMA Systems

Wireless Personal Communications: An International Journal

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Abstract

A carrier frequency offset (CFO) estimation and compensation method is proposal for downlink group-orthogonal multicarrier code-division multiple-access (GO-MC-CDMA) system. The proposed algorithm has taken into consideration both the inherent orthogonality among subcarriers of different groups of GO-MC-CDMA system and the characteristics of Fast Fourier Transform (FFT) demodulation are taken into consideration. The CFO estimation is achieved by searching the value which minimizes the cost function constructed in terms of performing FFT on the interfering signals. Simulation results show that the estimated value of CFO is very close to the real value for the downlink GO-MC-CDMA system. In addition, it is shown that the bit error rate (BER) performance is improved significantly by CFO compensation.