A Fast Time-recursive Matched Filter for DS-SS Communications

D. Akopian, S. Agaian, and H. Valio

Abstract:	Direct sequence spread spectrum (DS-SS) in its basic form is a method of taking a data signal that is used to modulate a sinusoidal carrier and then spreading its bandwidth to a much larger value by multiplying a single frequency carrier by a high-rate binary (-1,1) pseudorandom noise (PRN) code sequence that is known to users. Thus, the signal that is transmitted includes a data component, a PRN component, and a (sinusoidal) carrier component. At the receiver, a synchronized replica of the transmitted PRN code is required to de-spread the data sequence. The phase of the received code relative to the replica can be any possible value of code phase, due to uncertainties in position and time of transmission. Correlators align the incoming signal with the replicas. They are implemented either in time or frequency domain. Time domain correlators are more flexible in different processing scenarios but their computational complexity is higher compared with frequency domain approaches based on Fast Fourier Transform. In this paper we suggest an approach which reduces the computational load of conventional correlators using time-recursive computations.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	890 - 894
Cite this article:	Akopian, D., Agaian, S., Valio, H., "A Fast Time-recursive Matched Filter for DS-SS Communications," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 890-894.
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