Adaptive subband transforms in time-frequency excisers for DSSScommunications systems

Authors:
M.V. Tazebay;A.N. Akansu
Affiliations:
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ;-
Venue:
IEEE Transactions on Signal Processing
Year:
1995

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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