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The effect of imperfect carrier frequency offset estimation on an OFDMA uplink

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2 Author(s)
Zhongshan Zhang ; Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB ; Tellambura, C.

In the uplink of Orthogonal Frequency-Division Multiple Access (OFDMA) systems, the user carrier frequency offsets result in inter-carrier-interference (ICI) and multipleuser-interference (MUI), leading to a degradation of the bit error rate (BER). This paper treats this uplink scenario and derives the average uplink capacity and the BER using the signal-to-interference-and-noise ratio (SINR) analysis. Adaptive power allocation is suggested to increase the capacity. When the frequency offsets are modeled as zero-mean Gaussian or Uniform random variables, the BER is derived as a closed-form infiniteseries. The series requires at least 50 terms to ensure sufficient accuracy.

Published in:

Communications, IEEE Transactions on  (Volume:57 ,  Issue: 4 )

Date of Publication:

April 2009

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