Title :
Infinite length results and design implications for time-domain equalizers
Author :
Martin, Richard K. ; Ding, Ming ; Evans, Brian L. ; Johnson, C. Richard
Author_Institution :
Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
We show that maximum shortening signal-to-noise ratio (SNR) time-domain equalizers (TEQs) are often nearly symmetric. Constraining the TEQ to be symmetric causes only a 3% loss in bit rate (averaged over eight standard ADSL channels). Symmetric TEQs have greatly reduced design and implementation complexity. We also show that for infinite length TEQs, minimum mean squared error (MMSE) target impulse responses have all zeros on the unit circle, which can lead to poor bit rate performance.
Keywords :
equalisers; least mean squares methods; modulation; time-domain analysis; transient response; MMSE target impulse responses; SNR; channel shortening; fixed-point arithmetic; infinite length results; magnitude response; minimum mean squared errors; multicarrier modulation; reduced design complexity; signal-to-noise ratio; symmetric filters; time-domain equalizers; Bit rate; Convolution; Demodulation; Equalizers; Fast Fourier transforms; Finite impulse response filter; OFDM modulation; Redundancy; Signal to noise ratio; Time domain analysis;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2003.820064
