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Blind receiver for OFDM systems via sequential Monte Carlo in factor graphs

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 1-9页

作者： CHEN Rong ZHANG Hai-bin XU You-yun LIU Xin-zhao Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Institute of Communication Engineering PLA University of Science and Technology Nanjing 210007 China

Estimation and detection algorithms for orthogonal frequency division multiplexing (OFDM) systems can be de-veloped based on the sum-product algorithms, which operate by message passing in factor graphs. In this paper, we apply the sampling method (Monte Carlo) to factor graphs, and then the integrals in the sum-product algorithm can be approximated by sums, which results in complexity reduction. The blind receiver for OFDM systems can be derived via Sequential Monte Carlo (SMC) in factor graphs, the previous SMC blind receiver can be regarded as the special case of the sum-product algorithms using sampling methods. The previous SMC blind receiver for OFDM systems needs generating samples of the channel vector assuming the channel has an a priori Gaussian distribution. In the newly-built blind receiver, we generate samples of the virtual-pilots instead of the channel vector, with channel vector which can be easily computed based on virtual-pilots. As the size of the vir-tual-pilots space is much smaller than the channel vector space, only small number of samples are necessary, with the blind de-tection being much simpler. Furthermore, only one pilot tone is needed to resolve phase ambiguity and differential encoding is not used anymore. Finally, the results of computer simulations demonstrate that the proposal can perform well while providing sig-nificant complexity reduction.

关键词： Orthogonal frequency division multiplexing (OFDM) Factor graphs Sequential Monte Carlo (SMC) Blind receiver virtual-pilot

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