Effects of asynchronous MAI on average SEP performance of OFDMA uplink systems over frequency-selective Rayleigh fading channels

Authors:
Myonghee Park;Kyunbyoung Ko;Byungjoon Park;Daesik Hong
Affiliations:
Digital Media & Communication, R&D Center, Samsung Electronics, Suwon, Korea;Department of Information and Control Engineering, Chungju National University, Chungbuk, Korea;Digital Media & Communication, R&D Center, Samsung Electronics, Suwon, Korea;School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
Venue:
IEEE Transactions on Communications
Year:
2010

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Abstract

This paper investigates the effects of asynchronous multiple access interference (MAI) on the performance of orthogonal frequency-division multiple access (OFDMA) uplink systems in frequency-selective Rayleigh fading environments. We first analyze the MAI and its statistical characteristics using the Gaussian approximation. Then the analytical expression for the uncoded average symbol error probability (SEP) is obtained with various modulation schemes. Comparison with simulation results shows a tight agreement of the proposed analysis over a wide range of asynchronous timing errors and for various numbers of asynchronous users. Numerical examples show that when asynchronous timing errors reside within the guard interval, a performance of uncoded SEP ≤ 10-3 can be feasible even in high dispersive environments. Furthermore, the effect of the Gaussian approximation is examined, and the performance comparison between interleaved- and block-type subcarrier allocation schemes is provided.