Sidelobe cancellation and diversity reception using a single arr

Details Sidelobe cancellation and diversity reception using a single arr Sidelobe cancellation and diversity reception using a single arr

1993-12-14

1994-11-29

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

342381, G01S 316, G01S 328

Patent

active

053694120

ABSTRACT:
In a sidelobe canceller, a main channel multiplier (11) operates on the baseband output signal of a main antenna (10) with a weight signal to produce a weighted main channel signal. The baseband output signals of auxiliary antennas (16.sub.1 .about.16.sub.n) are adaptively weighted so that the auxiliary antennas have a first directivity pattern (44) whose main lobe oriented toward an undesired signal and summed together to produce a first sum signal (y.sub.s), and further adaptively weighted so that the auxiliary antennas have a second directivity pattern (45) whose main lobe is oriented toward a desired signal, and summed together to produce a second sum signal (y.sub.d). The second sum signal (y.sub.d) is summed with the weighted main channel signal to produce a diversity combined signal (y.sub.c), and the first sum signal (y.sub.s) is subtracted from the diversity combined signal (y.sub.c) to produce a sidelobe cancelled signal (y.sub.z). An adaptive equalizer (14) is provided for removing intersymbol interference from the sidelobe cancelled signal (y.sub.z). The main channel weight signal is derived by correlating the output of the adaptive equalizer with the output of the main antenna.

REFERENCES:
patent: 4516126 (1985-05-01), Masak et al.
patent: 4586045 (1986-04-01), Downie
patent: 4771289 (1988-09-01), Masak
Applebaum, Sidney P., IEEE Transactions on Antennas and Propagation, Adaptive Arrays, vol. AP-24, No. 5, Sep. 1976, pp. 585-598.

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