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Performance Analysis of Asynchronous OFDMA Uplink Systems with Timing Misalignments over Frequency-selective Fading Channels  

Park, Myong-Hee (연세대학교 전기전자공학과 정보통신연구실)
Ko, Kyun-Byoung (연세대학교 전기전자공학과 정보통신연구실)
Park, Byung-Joon (연세대학교 전기전자공학과 정보통신연구실)
Lee, Young-Il (수원대학교 전기공학과)
Hong, Dae-Sik (연세대학교 전기전자공학과 정보통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.2A, 2005 , pp. 34-42 More about this Journal
Abstract
In orthogonal frequency-division multiple access (OFDMA) uplink environments, asynchronously received signals can cause multiple access interference (MAI). This paper focuses on the performance degradation due to the MAI over frequency-selective fading channels. We first introduce the timing misalignment, which is defined as the relative timing difference between asynchronous timing error of uplink user and reference time of the base station, and analytically derive the MAI using the power delay profile of wide-sense stationary uncorrelated scattering (WSSUS) channel model. Then, the effective signal-to-noise ratio (SNR) and the average symbol error probability (SEP) are derived. The proposed analytical results are verified through simulations with respect to the region of the timing misalignment and the number of asynchronous users.
Keywords
OFDMA;
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