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


Vol. 32,  No. 11, pp. 1146-1153, Nov.  2007


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  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.

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  Cite this article

[IEEE Style]

H. Kim, Y. Jin, J. Ahn, "Novel allocation method of tiles in Subchannel for I/Q imbalances Estimation in WiBro uplink," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 11, pp. 1146-1153, 2007. DOI: .

[ACM Style]

Hye-jin Kim, Young-hwan Jin, and Jae-min Ahn. 2007. Novel allocation method of tiles in Subchannel for I/Q imbalances Estimation in WiBro uplink. The Journal of Korean Institute of Communications and Information Sciences, 32, 11, (2007), 1146-1153. DOI: .

[KICS Style]

Hye-jin Kim, Young-hwan Jin, Jae-min Ahn, "Novel allocation method of tiles in Subchannel for I/Q imbalances Estimation in WiBro uplink," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 11, pp. 1146-1153, 11. 2007.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880