Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping

Multiuser Diversity OFDMA using Power Priority Selection and Adaptive Clipping

Akihiro Kuroha (Graduate School of Engineering, Chiba University, Chiba, Japan), Chang-Jun Ahn (Graduate School of Engineering, Chiba University, Chiba, Japan), Tatsuya Omori (Graduate School of Engineering, Chiba University, Chiba, Japan) and Ken-ya Hashimoto (Graduate School of Engineering, Chiba University, Chiba, Japan)
Copyright: © 2014 |Pages: 13
DOI: 10.4018/ijdst.2014100102

Abstract

In recent, orthogonal frequency division multiple access (OFDMA) has been used for a multiuser wireless communication. In a wireless network, the transmitted signal of each user has independent channel fluctuation characteristic. By using this characteristic, OFDMA can achieve the multiuser diversity (MUDiv). Until this time, to achieve a low complexity and performance improvement, the adaptive subcarrier block (ASB) and frequency symbol spreading (FSS) methods have been proposed. However, the system performance in a low Eb/N0 is worse than that of maximal sum capacity (MSC) and peak to average power ratio (PAPR) does not decrease greatly. To solve these problems, in this paper, we propose the subcarrier allocation with the power priority selection (PSS) and the adaptive clipping (AC) with the peak reduction signal to improve the system and PAPR performance.
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System Model

Channel Model

We assume that the propagation channel consists of L discrete path with the different time delay. The impulse response for user m is represented as

(1) where and are the complex channel gain and the delay time of l-th propagation path for user m. The channel transfer function is the Fourier transform of and it is given by

(2)

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