Title :
Adaptive equalization for wireless ATM
Author :
Drewes, Christian ; Hasholzner, Ralph ; Hammerschmidt, J.S.
Author_Institution :
Inst. for Integrated Circuits, Tech. Univ. Munchen, Germany
Abstract :
The performance of various adaptive equalization strategies for broadband fixed radio systems to be used in the last mile is compared. Results are presented comparing linear equalizers with decision feedback equalizers and comparing the coefficient adjustments according to the zero forcing criterion with the mean squared error criterion. The performance measure is the resulting signal to noise and interference ratio at the decision device. The influence of the number of equalizer taps is shown as well as the effect of varying the rolloff factor of the transmit and receive filters. The performance of the LMS algorithm and of the RLS algorithm in terms of convergence speed is shown. The paper closes with a discussion of various fast least squares algorithms
Keywords :
adaptive equalisers; asynchronous transfer mode; broadband networks; convergence of numerical methods; decision feedback equalisers; least mean squares methods; radio networks; recursive estimation; subscriber loops; time division multiple access; 30 to 40 GHz; LMS algorithm; RLS algorithm; adaptive equalization; broadband fixed radio systems; coefficient adjustments; convergence speed; decision device; decision feedback equalizers; equalizer taps; fast least squares algorithms; linear equalizers; mean squared error criterion; performance measure; receive filter; rolloff factor; signal to interference ratio; signal to noise ratio; transmit filters; wireless ATM; zero forcing criterion; Adaptive equalizers; Convergence; Decision feedback equalizers; Filters; Interference; Least squares approximation; Least squares methods; Noise measurement; Resonance light scattering; Signal to noise ratio;
Conference_Titel :
Digital Signal Processing Proceedings, 1997. DSP 97., 1997 13th International Conference on
Conference_Location :
Santorini
Print_ISBN :
0-7803-4137-6
DOI :
10.1109/ICDSP.1997.627967
