Separation of communication signals in an adaptive antenna array

Details Separation of communication signals in an adaptive antenna array Separation of communication signals in an adaptive antenna array

1981-09-24

1985-04-23

Gruber, Felix D.

Boots, shoes, and leggings

343 5DP, 343 5NQ, 364570, 364582, G06F 1520, G01S 346

Patent

active

045133832

ABSTRACT:
Method and apparatus are disclosed for separating radio frequency signals incident upon an array of antenna elements which has available from each of the elements an input signal capable of being processed by the method and apparatus. The processing includes combining the input signals according to a first set of complex weights, thereby providing a first output signal. The first set of weights is derived from the input signals and from the first output signal and converges to the eigenvector corresponding to the largest eigenvalue of the cross-correlation matrix of the complex envelopes of the input signals. The input signals are also combined according to a second set of complex weights to provide a second output signal. The second set of weights is derived from the input signals, from the second output signal and from the first set of weights. The second set of weights converges to the eigenvector corresponding to the second largest eigenvalue of said cross-correlation matrix. As a result of this processing, the first and second output signals respectively, correspond, in general, to the first and second most powerful signals incident on the array. Additional sets of weights can be developed to separate any additional signals.

REFERENCES:
patent: 4099075 (1978-07-01), Goldberg et al.
patent: 4117538 (1978-09-01), Shrader et al.
patent: 4180814 (1979-12-01), Barton
patent: 4234939 (1980-11-01), Grall
Bershad et al.: Sonar Array Detection of Gaussian Signals in Gaussian Noise of Unknown Power. IEEE Transactions on Aerospace and Electronic Systems vol. AES-10 No. 1 Jan. 1974, pp. 94-99.
Applebaum: Adaptive Arrays, IEEE Transactions on Antennas and Propagation vol. AP-24 No. 5 Sep. 76 pp. 585/598.
White: Cascade Preprocessors for Adaptive Antennas, IEEE Transactions on Antennas and Propagation, vol. AP-24, No. 5, Sep. 1976, pp. 670-684.
White: Adaptive Cascade Networks for Deep Nulling, IEEE Transactions on Antennas and Propagation, vol. AP-26, No. 3, May 1978, pp. 396-402.
Hackett, Jr.: Adaptive Arrays can be used to Separate Communication Signals, IEEE Transactions on Aerospace and Electronic Systems, vol. AES-17, No. 2, Mar. 1981, pp. 234-247.
Corrections to above AES-17 No. 4 Jul. 1981 p. 606

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