Pilot-Aided Threshold Detection Combining for OFDM-CDMA Down Link Transmissions in a Frequency Selective Fading Channel(Regular section)
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概要
- 論文の詳細を見る
In OFDM-CDMA down link (base-to-mobile) transmissions, each user's transmit data symbol is spread over a number of orthogonal sub-carriers using an orthogonal spreading sequence defined in the frequency-domain. The radio propagation channel is characterized by a frequency- and time-selective multipath fading channel (which is called a doubly selective multipath fading channel in this paper). Frequency-domain equalization is necessary at the receiver to restore orthogonality among different users. This requires accurate estimation of the time varying transfer function of the multipath channel. Furthermore, the noise enhancement due to orthogonality restoration degrades transmission performance. In this paper, pilot-aided threshold detection combining (TDC) is presented that can effectively suppress the noise enhancement. If the estimated channel gain is smaller than the detection threshold, it is replaced with the detection threshold in the frequency equalization. There exists an optimal threshold that can minimize the bit error rate (BER) for a given received E_b/N_0. The average BER performance of OFDM-CDMA down link transmissions using the TDC is evaluated by computer simulations. It is found that TDC using optimum detection threshold can significantly reduce the BER floor and outperforms DS-CDMA with ideal rake combining.
- 社団法人電子情報通信学会の論文
- 2002-12-01
著者
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Adachi Fumiyuki
Wireless Laboratories Ntt Mobile Communications Network Inc.: Presently Electrical And Communication
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Adachi F
Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers
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ADACHI Fumiyuki
Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University
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Sao T
Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers
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Sao Tomoki
Electrical And Communication Engineering Graduate School Of Engineering Tohoku University
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Adachi Fumiyuki
Electrical And Communication Engineering Graduate School Of Engineering Tohoku University
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Adachi Fumiyuki
Department Of Electrical And Coimmunicalion Engineering Graduate School Of Engineering.tohoku Univer
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Adachi Fumiyuki
The Dept. Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Universi
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Adachi Fumiyuki
The Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Uni
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Adachi Fumiyuki
Wireless Lab. Ntt Docomo Inc.:department Of Electrical Communications At Graduate School Of Engineer
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Adachi Fumiyuki
The Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Uni
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Adachi Fumiyuki
The Wireless Laboratories Ntt Docomo Inc. : Presently With The Department Of Electrical Communicatio
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