Closed-form BER expression for OFDM with pilot-assisted channel estimation in a nonlinear multipath fading channel

Author

Ligata, Amir ; Smolnikar, Miha ; Mohorcic, Mihael ; Gacanin, Haris ; Adachi, Fumiyuki

Author_Institution

Commun. Dept., IPSA Inst., Sarajevo, Bosnia-Herzegovina

fYear

2010

fDate

17-19 Nov. 2010

Firstpage

441

Lastpage

445

Abstract

Orthogonal frequency division multiplexing (OFDM) system with frequency domain equalization (FDE) requires reliable channel estimation (CE). OFDM has a problem of high peak-to-average power ratio (PAPR), which makes it very sensitive to nonlinear distortions, affecting the channel estimation accuracy. In this paper, we investigate the effect of the nonlinearity to the the OFDM system with pilot-assisted CE based on time or frequency division multiplexed (TDM/FDM) pilot. A closed-form bit error rate (BER) expressions for OFDM system are derived in a nonlinear and frequency-selective fading channel. The analysis is based on the Gaussian approximation of the nonlinear noise, which is also confirmed by computer simulation. Our results in terms of BER and mean square error (MSE) show, that FDM-pilot based CE is more sensitive to nonlinear distortions as compared to CE based on TDM-pilot.

Keywords

Gaussian processes; OFDM modulation; channel estimation; equalisers; error statistics; fading channels; mean square error methods; multipath channels; nonlinear distortion; time division multiplexing; BER expressions; FDE; FDM pilot; Gaussian approximation; MSE; OFDM system; PAPR; TDM pilot; channel estimation accuracy; closed-form BER expression; closed-form bit error rate expressions; computer simulation; frequency division multiplexed pilot; frequency domain equalization; frequency-selective fading channel; mean square error; nonlinear distortions; nonlinear fading channel; nonlinear multipath fading channel; nonlinear noise; orthogonal frequency division multiplexing system; peak-to-average power ratio; pilot-assisted channel estimation; time division multiplexed pilot; Bit error rate; Channel estimation; Fading; Frequency division multiplexing; Noise; Nonlinear distortion; OFDM; OFDM; channel estimation; closed-form BER; nonlinearity;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Systems (ICCS), 2010 IEEE International Conference on

Conference_Location

Singapor

Print_ISBN

978-1-4244-7004-4

Type

conf

DOI

10.1109/ICCS.2010.5686603

Filename

5686603