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http://dx.doi.org/10.6109/jkiice.2016.20.12.2226

Performance Degradation of OFDMA Systems owing to Multi-User Interference  

Choi, Seung-Kuk (Department of Information and communications Engineering, Incheon University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.20, no.12, 2016 , pp. 2226-2234 More about this Journal
Abstract
Orthogonal Frequency Division Multiplexing (OFDM) technique uses multiple sub-carriers for the data transmission. Therefore, Inter Carrier Interference(ICI) is generated because of nonlinear high power amplifier and carrier frequency offset. Wireless OFDM transmission over Doppler fading channels also causes ICI. In OFDMA(Orthogonal Frequency Division Multiplexing Access), multiple sub-carriers are allocated to each user. Therefore, inter carrier interference causes interference to other users. I evaluate the BER performance of OFDMA systems in frequency selective fading channel, considering Multi-User Interference (MUI) owing to the carrier frequency offset, the nonlinear high power amplifier, and the Doppler fading. In the uplink OFDMA, multi-user interference introduces larger BER degradation than in the downlink. I explain the reason and obtain the required characteristics of the nonlinear amplifier and the value of frequency offset for good BER performance. And I also analyze the BER degradation upon Doppler fading channel.
Keywords
OFDMA; Multi-user Interference; Doppler Fading; Bit error rate;
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