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Directionally constrained adaptive beam forming to enhance interference nulling in direct-sequence spread-spectrum communication systems

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2 Author(s)
Jones, M.A. ; Electr. & Comput. Eng. Dept., Colorado Univ., Colorado Springs, CO, USA ; Wickert, M.A.

The authors examine a direct-sequence spread-spectrum communication system using an adaptive antenna array to null interference. The system model is a modification of Compton's (1990) system, using a digital implementation and a directional constraint. One of the primary roles of spread-spectrum modulation in the system is to remove the desired signal from the adaptive beam forming process. The simulated results of this directed system indicate that nulling of a tone jammer occurs without respect to direct-sequence code acquisition and that nulling of the desired signal occurs very slowly. Theoretical results are also obtained by using the system covariance matrix, and incorporating the effects of spread-spectrum filtering, to compute the system response as a function of time. These results show that the system may be made to null the jammer quickly and consistently, by using the auxiliary beam output power as a parameter in the least mean-squares (LMS) adaptive beam-forming algorithm

Published in:

Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE  (Volume:1 )

Date of Conference:

11-14 Oct 1993

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