Two-step Scheduling With Reduced Feedback Overhead in Multiuser Relay Systems 


Vol. 36,  No. 5, pp. 511-520, May  2011


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  Abstract

In this paper, we introduce a multiuser (MU) scheduling method for multiuser amplify-and-forward relay systems, which selects both the transmission mode, i.e., either one- or two-hop transmission, and the desired user via two steps. A closed-form expression for the average achievable rate of the proposed scheduling is derived under two transmission modes with MU scheduling, and its asymptotic solution is also analyzed in the limit of large number of mobile stations. Based on the analysis, we perform our two-step scheduling algorithm: the transmission mode selection followed by the user selection that needs partial feedback for instantaneous signal-to-noise ratios (SNRs) to the base station. We also analyze the average SNR condition such that the MU diversity gain is fully exploited. In addition, it is examined how to further reduce a quantity of feedback under certain conditions. The proposed algorithm shows the comparable achievable rate to that of the optimal one using full feedback information, while its required feedback overhead is reduced below half of the optimal one.

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  Cite this article

[IEEE Style]

Y. Jang, W. Shin, A. Kim, "Two-step Scheduling With Reduced Feedback Overhead in Multiuser Relay Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 36, no. 5, pp. 511-520, 2011. DOI: .

[ACM Style]

Yong-Up Jang, Won-Yong Shin, and Ajung Kim. 2011. Two-step Scheduling With Reduced Feedback Overhead in Multiuser Relay Systems. The Journal of Korean Institute of Communications and Information Sciences, 36, 5, (2011), 511-520. DOI: .

[KICS Style]

Yong-Up Jang, Won-Yong Shin, Ajung Kim, "Two-step Scheduling With Reduced Feedback Overhead in Multiuser Relay Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 36, no. 5, pp. 511-520, 5. 2011.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880