DWMT transceiver equalization using overlap FDE for downlink ADSL

Authors : ARSLA KHAN, SOBIA BAIG, TABASSUM NAWAZ

Pages : 681-697

Doi:10.3906/elk-1212-50

View : 19 | Download : 3

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Discrete wavelet multitone insert ignore into journalissuearticles values(DWMT); modulation is a wavelet transform based technique implemented using perfect reconstruction filter banks. It has been recently proposed for various wireline channels such as digital subscriber loops insert ignore into journalissuearticles values(DSLs); as a solution to the problems posed by a discrete multitone insert ignore into journalissuearticles values(DMT); transceiver including interblock interference insert ignore into journalissuearticles values(IBI); and lower spectral efficiency due to the employment of a cyclic prefix insert ignore into journalissuearticles values(CP); in the guard interval insert ignore into journalissuearticles values(GI); for DMT symbols. The greater side lobe attenuation offered by wavelet filter banks results in improved spectral containment and lower IBI in DWMT transceivers. However, no standard equalization technique exists for a DWMT based transceiver so as to remove the effect of channel on the transmitted signal in DWMT systems. This paper proposes the application of overlap frequency domain equalization insert ignore into journalissuearticles values(OFDE); in DWMT modulated systems and compares the bit error rate insert ignore into journalissuearticles values(BER); performance with time domain equalization insert ignore into journalissuearticles values(TDE); technique. It is shown through simulation results that minimum mean square error insert ignore into journalissuearticles values(MMSE); based OFDE can be applied as an equalization technique for a downlink asymmetric DSL insert ignore into journalissuearticles values(ADSL); channel with lower computational complexity and BER performance comparable to that of TDE.
Keywords : AWGN, NEXT, FEXT, DWMT, TDE, overlap FDE