Interference rejection in FFH systems using least squares estimation techniques

Author

Iltis, Ronald A. ; Ritcey, James A. ; Milstein, Laurence B.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

Volume

38

Issue

12

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

2174

Lastpage

2183

Abstract

A fast frequency-hopped (FFH) receiver which uses a prewhitening filter to reject narrowband interference is described. By using an appropriate fractional tap spacing, it is shown that interference can be estimated independently of the desired signal. Bit error rate results are presented for the receiver for linear square-law combining. The results compare favorably to those obtained by a near-optimal automatic gain-control (AGC) combining technique. The performance of the prewhitening filter interference rejection method is shown to be superior to that of a nonparametric self-normalizing receiver. Finally, simulation results for an FFH receiver using the complex least mean-square (LMS) algorithm to update the prewhitening filter coefficients are presented

Keywords

digital filters; frequency agility; interference suppression; least squares approximations; spread spectrum communication; AGC combining; BER; FFH systems; automatic gain-control; bit error rate; complex LMS algorithm; fast frequency-hopped receiver; filter coefficients; fractional tap spacing; least squares estimation; linear square-law combining; narrowband interference rejection; prewhitening filter; simulation results; Bit error rate; Frequency estimation; Helium; Interference; Jamming; Least squares approximation; Narrowband; Nonlinear filters; Recursive estimation; Signal restoration;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.64660

Filename

64660