Title :
Hyperstable adaptation of "resonator-in-loop" line enhancer
Author :
Krishna, V.V. ; Hiremath, Channamallesh G.
Author_Institution :
ZSP Corp., Santa Clara, CA, USA
Abstract :
One of the different adaptation strategies employed with the resonator-in-loop (RIL) adaptive line enhancer (ALE) relies on "hyperstability" aimed at fast tracking of time varying sinusoids in MFSK and frequency-hop communications. We examine the bias associated with frequency estimation for the case of a single sinusoid in noise. The extent of bias is both SNR and frequency dependent. This is seen to be solely a limitation of the hyperstable adaptation method rather than the RIL ALE itself.
Keywords :
adaptive filters; circuit stability; filtering theory; frequency estimation; frequency hop communication; frequency shift keying; noise; notch filters; resonator filters; tracking; MFSK; SNR; adaptive IIR filter; adaptive line enhancer; adaptive notch filter; bias; fast tracking; frequency estimation; frequency-hop communications; hyperstability; hyperstable adaptation method; resonator-in-loop line enhancer; time varying sinusoids; Adaptive filters; Convergence; Filtering; Finite impulse response filter; Frequency dependence; Frequency estimation; IIR filters; Line enhancers; Signal to noise ratio; White noise;
Conference_Titel :
Signals, Systems & Computers, 1998. Conference Record of the Thirty-Second Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5148-7
DOI :
10.1109/ACSSC.1998.750916
