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

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 th...

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Bibliographic Details
Published in:IEEE transactions on communications 2010-02, Vol.58 (2), p.586-599
Main Authors: PARK, Myonghee, KO, Kyunbyoung, PARK, Byungjoon, HONG, Daesik
Format: Article
Language:English
Subjects:
Applied sciences
Approximation
asynchronous MAI
Channels
Downlink
Error analysis
Error probability
Exact sciences and technology
Fading
Frequency synchronization
frequency-selective Rayleigh fading channels
Gaussian
Gaussian approximation
Information technology
Information, signal and communications theory
Intersymbol interference
Mathematical analysis
Modulation, demodulation
Multiple access
Multiple access interference
Multiplexing
OFDMA
Organization, operation and development plans
performance analysis
Radiocommunications
Signal and communications theory
symbol error probability
System performance
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Time measurements
Timing
Transmission and modulation (techniques and equipments)
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Summary: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.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2010.02.050324