Interference cancelling system for a mobile subscriber access co

Details Interference cancelling system for a mobile subscriber access co Interference cancelling system for a mobile subscriber access co

1982-12-01

1984-02-28

Griffin, Robert L.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 63, 375 58, H04B 1500

Patent

active

044345054

ABSTRACT:
Undesired intentional interference, i.e. jamming signals in a multiple acsing 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 communications 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

REFERENCES:
patent: 4301530 (1981-11-01), Gutleber
patent: 4308614 (1981-12-01), Fisher et al.

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