Carrier frequency offset estimation & compensation in AMC OFDM

Author

Patel, V.U. ; Shah, H.K. ; Soni, H.B. ; Dasgupta, K.S.

fYear

2013

fDate

1-2 March 2013

Firstpage

302

Lastpage

305

Abstract

Sensitivity to Carrier Frequency Offset (CFO) is a well known issue in Orthogonal Frequency Division Multiplexing (OFDM). The recent wireless standards, which propose OFDM as modulation technique, prefer to use it with Adaptive Modulation and Coding (AMC). Inter carrier interference (ICI) created by CFO disturbs the selection of modulation order and channel coding rate in AMC. Effect of CFO on OFDM with AMC is studied in this work. The survey of Fractional CFO (FCFO) estimation techniques is presented in this paper. The optimal but complex to implement method for CFO estimation-the ML estimation is applied to OFDM with AMC. Efforts are made to reduce its complexity while actual implementation. Performance comparison of original and reduced complexity methods are presented based on accuracy and complexity.

Keywords

OFDM modulation; adaptive codes; adaptive modulation; channel coding; channel estimation; frequency estimation; intercarrier interference; maximum likelihood estimation; modulation coding; radio networks; AMC OFDM; FCFO estimation techniques; ICI; ML estimation; adaptive modulation and coding; carrier frequency offset compensation; carrier frequency offset estimation; channel coding rate; fractional CFO estimation techniques; intercarrier interference; modulation order selection; modulation technique; orthogonal frequency division multiplexing; reduced complexity methods; wireless standards; Bit error rate; Encoding; Estimation; Frequency modulation; OFDM; Signal to noise ratio; Adaptive Modulation; CFO; Coding; ML estimation; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Systems and Signal Processing (ISSP), 2013 International Conference on

Conference_Location

Gujarat

Print_ISBN

978-1-4799-0316-0

Type

conf

DOI

10.1109/ISSP.2013.6526923

Filename

6526923