Method and apparatus for interference cancellation

Details Method and apparatus for interference cancellation Method and apparatus for interference cancellation

1998-03-30

1999-12-21

Chin, Wellington

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 65, 455 69, 455 675, H04Q 720

Patent

active

060060727

ABSTRACT:
In first radio station and a second radio station constituting a radio transmission system using spatial duplex diversity, interference signals are cancelled by a power inversion adaptive array (PIAA). One branch of the transmission side is multiplied by a complex coefficient multiplier so that the desired received signal has the optimum vector value after a combination of two branches and PIAA processing. An envelope detector detects the received signal level with an envelope detector at the receiving side, feeds back the received signal level information to the transmission side through the transmission baseband circuit, extracts the information with the receiving baseband circuit at the transmission side, and inputs the information into a constant modulus algorithm control circuit. The constant envelope algorithm control circuit sequentially controls the complex coefficient multiplier so that the multiplier has an optimum value.

REFERENCES:
patent: 4969211 (1990-11-01), Raymond
patent: 5379046 (1995-01-01), Tsujimoto
patent: 5392459 (1995-02-01), Baba et al.
patent: 5630223 (1997-05-01), Babu et al.
patent: 5768698 (1998-06-01), Kinoshita
R.R. Compton, Jr., "The Power-Inversion Adaptive Array: Concept and Performance", IEEE Transactions on Aerospace and Electronic Systems, vol. AES-15, No. 6, Nov. 1979, pp. 803-814.
J.R. Treichler et al., "A New Approach to Multipath Correction of Constant Modulus Signals", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-31, No. 2, Apr. 1983, pp. 459-472.

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