H - Electricity – 04 – K
Patent
H - Electricity
04
K
325/3, 325/45
H04K 1/00 (2006.01) H04B 1/12 (2006.01) H04B 1/707 (2006.01)
Patent
CA 1187942
Abstract of the Disclosure An adaptive interference cancelling system for multi- bit spread spectrum noise codes wherein a plurality of users in a mobile subscriber access system each operates with a different noise code. Each user receives a composite signal which includes a desired noise coded signal from another user plus any unwanted interference noise coded signals from other like users in relatively close proximity. The RF demodulator or front end section of each user receiver is coupled to a bank of matched filters which selectively detect and identify any interfering codes. These interfering codes are then regenerated devoid of the desired signal to provide a coherent replica of the interference signal. The received composite signal and the coherent replica of one or more interference signals are applied to individual signal subtractor circuits which operate to cancel the interfering noise coded signals leaving the desired signal to be subsequently matched filter detected free of interference from other users.
435412
Aspila Kalevi P.
The Government Of The United States As Represented By The Secret
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