Title :
Interference nulling in direct-sequence spread-spectrum systems using a main-beam reference in the delay space
Author :
Jones, Mark A. ; Wickert, Mark A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Colorado Springs, CO, USA
Abstract :
The authors discuss an interference nulling technique that transforms the output vector of a linear antenna array to a vector made of independent beams in the delay space. The signal of interest (SOI) is located in the center of a main beam in the delay space and is used as a reference in two steepest-descent feedback algorithms to null interference appearing on the remaining beams. When direct-sequence spread-spectrum is incorporated in the model, it is found that the SOI only affects nulling when the spreading code is not synchronized and the signal is spatially misaligned with the main beam of the antenna array
Keywords :
antenna phased arrays; array signal processing; interference suppression; spread spectrum communication; adaptive antenna systems; delay space; direct-sequence spread-spectrum systems; interference ing; linear antenna array; main-beam reference; steepest-descent feedback algorithms; Adaptive arrays; Antenna arrays; Delay; Ear; Interference; Satellite antennas; Satellite communication; Spread spectrum communication; Springs; System performance;
Conference_Titel :
Military Communications Conference, 1992. MILCOM '92, Conference Record. Communications - Fusing Command, Control and Intelligence., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0585-X
DOI :
10.1109/MILCOM.1992.244035