Non-orthogonal mobile subscriber multiple access system
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United States of America Patent
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Sep 4, 1984
Grant Date -
N/A
app pub date -
Nov 4, 1982
filing date -
Nov 4, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An adaptive interference cancelling system for multibit 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.
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