Variable forgetting factor linear least squares algorithm for frequency selective fading channel estimation

Author

Song, Seongwook ; Lim, Jun-Seok ; Baek, Seong Joon ; Sung, Koeng-Mo

Author_Institution

Sch. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

51

Issue

3

fYear

2002

fDate

5/1/2002 12:00:00 AM

Firstpage

613

Lastpage

616

Abstract

In this article, the variable forgetting factor linear least squares algorithm is presented to improve the tracking capability of channel estimation. A linear channel model with respect to time change describes a time-varying channel more accurately than a conventional stationary channel model. To reduce the estimation error due to model mismatch, we incorporate the modified variable forgetting factor into the proposed algorithm. Compared to the existing algorithms-exponentially windowed recursive least squares algorithm with the optimal forgetting factor and linear least squares algorithm-the proposed method makes a remarkable improvement in a fast fading environment. The effects of channel parameters such as signal-to-noise ratio and fading rate are investigated by computer simulations

Keywords

fading channels; land mobile radio; least squares approximations; parameter estimation; polynomial approximation; recursive estimation; time-varying channels; channel parameters; computer simulations; estimation error; exponentially windowed recursive least squares algorithm; fading rate; fast fading environment; frequency selective fading channel estimation; linear channel model; linear least squares algorithm; linear polynomial model-based EW-RLS; mobile wireless channels; model mismatch; optimal forgetting factor; signal-to-noise ratio; stationary channel model; time-varying channel; underwater acoustic channels; variable forgetting factor linear least squares algorithm; Adaptive equalizers; Channel estimation; Estimation error; Fading; Frequency estimation; Least squares approximation; Least squares methods; Polynomials; Signal to noise ratio; Time-varying channels;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2002.1002509

Filename

1002509