How to compensate the detrimental impact of intercarrier interference (ICI) on BER performance is the key issue of signal detection for orthogonal frequency division multiplexing (OFDM) systems in doubly selective channels. In this paper, we propose an optimal linear ICI suppression algorithm with successive detection based on oversampling at the receiver, by which the OFDM systems can benefit from doubly selective channels for achieving both the multipath diversity and Doppler diversity. To reduce the additional computational complexity caused by oversampling, a low complexity implementation method for this algorithm is also presented. Simulations results show that the proposed algorithm can enhance the BER performance with the increase of the Doppler spread and the oversampled factor.
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This work was supported by the National Natural Science Foundation of China under Grant No. 61271299, by the 111 Project (B08038) and supported by the Fundamental Research Funds for the Central Universities Teacher by the Ministry of Education (No. K5051301034).
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Hui, Y., Li, B. & Tong, Z. The Diversity Gain and ICI Suppression for OFDM Systems Over Doubly Selective Channels. Wireless Pers Commun 77, 1465–1476 (2014). https://doi.org/10.1007/s11277-013-1592-z
- Doubly selective channels
- Multipath diversity
- Doppler diversity