Accession Number : ADD009877

Title :   Non-Orthogonal Mobile Subscriber Mutiple Access System.

Descriptive Note : Patent Applications,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Gutleber,Frank S

Report Date : 04 Nov 1982

Pagination or Media Count : 13

Abstract : An adaptive interference cancelling system is described 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 replicca 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.

Descriptors :   *Patent applications, *Communication and radio systems, *Multiple access, *Noise reduction, *Time division multiplexing, Mobile, Autocorrelation, Radiofrequency interference, Cancellation, Spread spectrum, Matched filters, Signal to noise ratio

Subject Categories : Acoustics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE