Iterative MAP Receiver Employing Forward Channel Estimation via Message Passing for OFDM over Fast Fading Channels
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概要
- 論文の詳細を見る
This paper proposes an iterative maximum ia posteriori/i (MAP) receiver for orthogonal frequency division multiplexing (OFDM) mobile communications under fast-fading conditions. The previous work in [21] developed a MAP receiver based on the expectation-maximization (EM) algorithm employing the differential model, which can allow correlated time-variation of channel impulse responses. In order to make such a MAP receiver more robust against time-variant channels, this paper proposes two new message-passing algorithms derived from factor graphs; subcarrier removal and partial turbo processing. The subcarrier removal estimates the channel frequency response by using all subcarriers other than the targeted subcarrier. Such channel estimate can be efficiently calculated by removing information on the targeted subcarrier from the estimate of the original EM algorithm that uses all the subcarriers. This modification can avoid the repetitive use of incorrectly detected signals for the channel estimation. On the other hand, the partial turbo processing performs symbol-by-symbol channel decoding by using a symbol interleaver. Owing to this process, the current channel estimate, which is more accurate due to the decoding gain, can be used as the initial channel estimate for the next symbol. Computer simulations under fast multipath fading conditions demonstrate that the subcarrier removal and the partial turbo processing can improve the error floor and the convergence speed, respectively, compared to the conventional MAP receiver.
- The Institute of Electronics, Information and Communication Engineersの論文
- 2012-05-01
著者
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Suzuki Hiroshi
The Third Department of Internal Medicine, Showa University School of Medicine
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MURAOKA Kazushi
Tokyo Institute of Technology
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SUYAMA Satoshi
Tokyo Institute of Technology
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Suyama S
Tokyo Inst. Of Technol. Tokyo Jpn
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Fukawa K
Tokyo Inst. Technol. Tokyo Jpn
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Fukawa Kazuhiko
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Suzuki H
National Research Center For Protozoan Diseases Obihiro University Of Agriculture And Veterinary Med
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Muraoka Kazushi
The Tokyo Institute Of Technology
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Suyama Satoshi
The Tokyo Institute Of Technology
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FUKAWA Kazuhiko
the Tokyo Institute of Technology
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