Channel estimation and equalization in OFDM receiver for WiMAX with Rayleigh distribution

Author

Reddy, B. Siva Kumar ; Lakshmi, B.

Author_Institution

Dept. of Electron. & Commun. Eng., Nat. Inst. of Technol., Warangal, India

fYear

2013

fDate

21-23 Sept. 2013

Firstpage

337

Lastpage

339

Abstract

WiMAX is a broadband wireless access technology supports fixed and mobility services. WiMAX physical layer is based on OFDM/OFDMA technologies. This paper analyzes the Rayleigh fade distribution with various modulating frequencies (fm) by varying number of frequency samples. Least square (LS) and Linear Minimum Mean Square Error (LMMSE) channel estimators are compared in terms of BER, SNR and MSE (Mean Square Error) by varying channel length. Blind Channel equalization is analyzed with CMA (Constant Modulus Algorithm) and LMS (Least Minimum Square) algorithms in terms of convergence rate by varying the smoothening length of the channel. The results proved that without channel estimation BER is almost constant for all modulation schemes.

Keywords

OFDM modulation; Rayleigh channels; WiMax; blind equalisers; channel estimation; error statistics; frequency division multiple access; least mean squares methods; radio receivers; BER; CMA; LMMSE; OFDM receiver; OFDM-OFDMA technology; Rayleigh fade distribution; SNR; WiMAX physical layer; blind channel equalization; broadband wireless access technology; channel estimation; channel length; constant modulus algorithm; convergence rate; fixed services; least square error; linear minimum mean square error; mobility services; smoothening length; Bit error rate; Channel estimation; Least squares approximations; Modulation; OFDM; Receivers; WiMAX; CMA; LMMSE; LMS; LS; MSE; OFDM; OFDMA;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Electronic Systems (ICAES), 2013 International Conference on

Conference_Location

Pilani

Print_ISBN

978-1-4799-1439-5

Type

conf

DOI

10.1109/ICAES.2013.6659425

Filename

6659425