Adaptive subband transforms in time-frequency excisers for DSSS communications systems

Author

Tazebay, Mehmet V. ; Akansu, Ali N.

Author_Institution

Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA

Volume

43

Issue

11

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

2776

Lastpage

2782

Abstract

A smart time-frequency exciser for DS-SS communications is proposed in this correspondence. This technique utilizes the concept of uncertainty in time-frequency analysis of signals. It brings the novel concept of domain switchable signal processing. Hence, the adaptive time-frequency (ATF) exciser has the capability of deciding the domain of the interference cancellation. Additionally, adaptive subband transforms are utilized for frequency domain excision. For time-domain excision, the ATF excision algorithm utilizes a sliding time window to reject the nonstationary, pulsed (time-localized) interference. It is shown that the proposed adaptive time-frequency exciser-based DS-SS communications receiver drastically outperforms the existing systems. Its performance is nearly optimal and very robust to the inter and intradomain variations of the undesired signal

Keywords

adaptive filters; adaptive signal processing; interference suppression; jamming; pseudonoise codes; spread spectrum communication; time-frequency analysis; transforms; DS-SS communications; adaptive subband transforms; direct sequence spread spectrum communication; domain switchable signal processing; frequency domain excision; interference cancellation; jammer; nonstationary pulsed interference rejection; signal analysis; sliding time window; time-domain excision; time-frequency analysis; time-frequency excisers; uncertainty; Adaptive signal processing; Communication switching; Frequency domain analysis; Interference cancellation; Robustness; Signal processing algorithms; Spread spectrum communication; Time domain analysis; Time frequency analysis; Uncertainty;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.482125

Filename

482125