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

Author

Zhang, Zhongshan ; Tellambura, Chintha

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB

Volume

57

Issue

4

fYear

2009

fDate

4/1/2009 12:00:00 AM

Firstpage

1025

Lastpage

1030

Abstract

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.

Keywords

OFDM modulation; error statistics; intercarrier interference; OFDMA uplink; adaptive power allocation; bit error rate degradation; imperfect carrier frequency offset estimation; intercarrier-interference; multiple-user-interference; orthogonal frequency-division multiple access systems; signal-to-interference-and-noise ratio analysis; user carrier frequency offsets; Bit error rate; Degradation; Frequency estimation; Interference; OFDM; Phase shift keying; Quadrature amplitude modulation; Random variables; Signal analysis; Signal to noise ratio; Carrier frequency offset, bit error rate, OFDMA;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.04.070246

Filename

4814369