Title: Adaptive antenna lobing on spread spectrum signals at negative S/N

Abstract: In a communications system including a multiple antenna array with null steering apparatus, a desired signal and an identifier signal are transmitted, the desired signal including a first carrier modulated with bits of data delayed a predetermined period and with a random code and the identifier signal being substantially reduced in amplitude relative to the desired signal and including a second carrier in phase quadrature with the first carrier and modulated with the bits of data and with the random code, which transmitted signal is received in the null steering apparatus where the data from the identifier signal, which leads the data of the desired signal, is utilized to modulate the recovered first carrier and is adjusted in amplitude to cause the null steering apparatus to lobe on the desired signal, the remodulated carrier being utilized as a reference signal in the feedback circuits of the null steering apparatus.

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Inventors: Piesinger, Gregory H. (Scottsdale, AZ, US)

Application Number: 877133
Filing Date: 1978-02-13
Publication_date: 1979-05-01
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Class(es): 342/367 342/370, 342/376, 342/380, 342/383, 375/150, 375/285
Other Classes:
US Patent Ref:

3763490

Oct, 1973

Hadley et al.

343/100.

Other Refs:
Primary Examiner: Blum, Theodore M.
Assistant Examiner:
Attorney: Parsons; Eugene A.