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Novel allocation method of tiles in Subchannel for I/Q imbalances Estimation in WiBro uplink  

Kim, Hye-Jin (충남대학교 전자전파정보통신공학과 이동멀티미디어통신연구실)
Jin, Young-Hwan (충남대학교 전자전파정보통신공학과 이동멀티미디어통신연구실)
Ahn, Jae-Min (충남대학교 전자전파정보통신공학과 이동멀티미디어통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.11A, 2007 , pp. 1146-1153 More about this Journal
Abstract
In this paper, we analyze the I/Q imbalances effects at the WiBro uplimk when using direct-conversion RF transceiver. If I/Q imbalance exists, the transmit signal is spread over two sbcarriers. As a result, phenomenon of performance reducing is produced. Contrary to OFDM system in which one user uses all subcarrier, symmetrical two subcarriers are assigned other users in OFDMA system. I/Q imbalances elements can't be estimated such a conventional allocation method of tiles in subchannel and compensated. In order to solve the problem, We propose a new method in order that symmetrical two subcarriers are assigned one user. If novel method is applied, we can estimate I/Q imbalances and compensate distortion received signal. As a result, we can obtain a performance similar performance when I/Q imbalances is not existed. Also, if proper detection methods are used, we get the effect of performance improvement, because of diversity gain what is happened due to combining I/Q imbalances with multi path fading channel.
Keywords
I/Q Imbalances; WiBro; OFDMA; Diversity gain; PUSC;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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