Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
M. Salih , Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA
S. Tantaratana , Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA
We propose a closed-loop system for acquisition of the pseudo-noise (PN) sequence in direct-sequence spread-spectrum (DS/SS) systems. We introduce a novel idea of using an auxiliary sequence, as opposed to the PN sequence itself, for correlation with the incoming signal. The correlation function of the auxiliary sequence and the PN sequence has a triangle shape that covers essentially the entire period of the PN sequence. Consequently, their correlation provides the direction for the phase update of the local sequence generator in the acquisition scheme. With coherent demodulation, the average acquisition time of the proposed scheme is derived and is compared to that of the conventional serial-search acquisition receiver. Results suggest that the proposed system acquires PN phase at least twice faster.<
pseudonoise codes, spread spectrum communication, radio receivers, demodulation, correlation methods
M. Salih and S. Tantaratana, "A closed-loop coherent PN acquisition scheme for DS/SS systems using an auxiliary sequence," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 99-103.