H - Electricity – 04 – K
Patent
H - Electricity
04
K
325/10, 325/41,
H04K 3/00 (2006.01)
Patent
CA 1186742
Abstract of the Disclosure 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 sub- scriber terminals in a dedicated orthogonal multiplexed channel. relative to respective signal channels carrying desired communi- cations 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 de- sired signal.
439910
Aspila Kalevi P.
The Government Of The United States As Represented By The Secret
LandOfFree
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