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| Two linear intercarrier interference cancellation techniques in ofdm systems over multipath channels |
| Wang Yi ;Zhang Zhongpei; Zhao Ming; Zhou Shidong; Xu Xibin |
| State Key Lab on Microwave and Digital Commun., Tsinghua Univ., Beijing 100084 China |
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Abstract InterCarrier Interference (ICI) is an important, factor degrading the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems. Two linear ICI cancellation techniques, Frequency RAKE (F-RAKE) and frequency equalization (F-FIR), with different length of delay-line, L, are studied in this paper. Assuming that the channel information is known in the receiver and MMSE criterion is adopted for F-FIR, results show that F-RAKE has about 2~5dB Carrier-Interference-Ratio (CIR) achievement than standard receiver in case of L=3. Meanwhile, F-FIR has about 2~7 dB CIR achievement. And the CIR performance gains of the two schemes decrease with increment of L. Also, the computational complexity of F-FIR is L times than that of F-RAKE. Thus, the tradeoff between complexity and performance in the engineering can be reached by selecting the length of delay-line and receiver scheme.
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Received: 11 December 2001
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2003, Vol. 25 
