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Titolo: Analysis on the convergence property of quantizedx NLMS algorithm
Autore: Fujii, K; Tanaka, Y;
 Indirizzi:
 Fujitsu Labs Ltd, Wireless Commun Syst Lab L41, Nakahara Ku, Kawasaki, Kanagawa 2118588, Japan Fujitsu Labs Ltd Kawasaki Kanagawa Japan 2118588 Kanagawa 2118588, Japan
 Titolo Testata:
 IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
fascicolo: 8,
volume: E84A,
anno: 2001,
pagine: 1840  1847
 SICI:
 09168508(200108)E84A:8<1840:AOTCPO>2.0.ZU;2R
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 PERFORMANCE;
 Keywords:
 convergence property; convergence condition; IIR filter expression; NLMS algorithm; quantization step;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Engineering, Computing & Technology
 discip_EC
 Citazioni:
 19
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Fujii, K Fujitsu Labs Ltd, Wireless Commun Syst Lab L41, Nakahara Ku, Kawasaki, Kanagawa 2118588, Japan Fujitsu Labs Ltd Kawasaki Kanagawa Japan 2118588 2118588, Japan



 Citazione:
 K. Fujii e Y. Tanaka, "Analysis on the convergence property of quantizedx NLMS algorithm", IEICE T FUN, E84A(8), 2001, pp. 18401847
Abstract
The adaptive system design by 16bit fixed point processing enables to employ an inexpensive digital signal processor (DSP). The narrow dynamic rangeof such 16 bits, however. does not guarantee the same performance that is confirmed beforehand by computer simulations. A cause of degrading the performance originates in the operation halving the word length doubled by multiplication. This operation rounds off small signals staying in the lower half of the doubled word length to zero. This Problem can be solved by limiting the multiplier to only its sign (+/) like the signed regressor algorithm, named 'biquantizedx' algorithm in this paper, for the convenience mentioned below. This paper first derives the equation describing the convergence property provided by a type of signed regressor algorithms. the biquantizedx normalized least mean square (NLMS) algorithm, and then formulates it., convergence condition and the step size maximizing the convergence rate. This paper second presents a technique to improve the convergence property. The biquantizedx NLMS algorithm quantizes the reference signal to +/1according to the sign of the reference signal. whereas the technique moreover assigns zero to the reference signal whose amplitude is less than a predetermined level. This paper explains the principle that the 'triqunatizedx' NLMS algorithm employing the technique can improve the convergence property, and confirms the improvement effect by computer simulations.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 18:22:59