Title :
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
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;
Conference_Titel :
Advanced Electronic Systems (ICAES), 2013 International Conference on
Conference_Location :
Pilani
Print_ISBN :
978-1-4799-1439-5
DOI :
10.1109/ICAES.2013.6659425
