Accession Number : ADD009980

Title :   Interference Cancelling System for a Mobile Subscriber Access Communications System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Gutleber,Frank S

Report Date : 01 Dec 1982

Pagination or Media Count : 30

Abstract : Undesired intentional interference, i.e. jamming signals in a multiple accessing mobile subscriber system employing a plurality of subscriber communication terminals, selectively transmitting and receiving desired signals from one another via a central node or repeater station, is achieved by intercepting relatively strong jamming signals, also directly received by the various subscriber communication terminals, and transmitting the jamming signals to the central node where they are then retransmitted or relayed to the subscriber terminals in a dedicated orthogonal multiplexed channel relative to respective signal channels carrying desired communication signals. Each terminal includes means for demultiplexing the orthogonal channel and the signal channel. The relayed jamming signals are adjusted in amplitude and time position so that they are equal to and coincident in time with the directly received jamming signals. The two jamming signals are then fed to signal differencing means which operates to cancel the jamming signals while providing an interference free output of the desired signal. (Author)

Descriptors :   *PATENT APPLICATIONS, *SUPPRESSORS, *CANCELLATION, *INTERFERENCE, *ACCESS, *ANTIJAMMING, POSITION(LOCATION), COMMUNICATION EQUIPMENT, CHANNELS, COMMUNICATION TERMINALS, NODES, STATIONS, REPEATERS, JAMMING, TIME, SIGNALS, ORTHOGONALITY, OUTPUT

Subject Categories : Countermeasures
      Radiofrequency Wave Propagation
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE