Method and apparatus to permit substantial cancellation of inter

Details Method and apparatus to permit substantial cancellation of inter Method and apparatus to permit substantial cancellation of inter

1977-06-03

1979-12-11

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 15AE, 325 4, 3401461BE, 343100CS, 343100ST, 343201, 343207, H04J 1300, H04B 360, H04B 1500

Patent

active

041785509

ABSTRACT:
The present invention relates to method and apparatus for substantially reducing the effects of interference at a receiver between concurrently received first and second digital signals which use the same frequency spectrum. Interference between signals is effectively reduced by transmitting the first digital signal in an uncoded form while concurrently transmitting the second digital signal with both reduced capacity when compared with the first signal and in coded form using a forward error correcting code such as, for example, a block or convolutional code. At the receiver intercepting both digital signals, a suitable detection process is performed to decode the second signal and separate both signals. The present invention is applicable to the simultaneous satellite transmission of an area coverage beam and a plurality of spot coverage beams or to increase capacity on a radio channel.

REFERENCES:
patent: Re27478 (1972-09-01), Battail et al.
patent: 2520184 (1950-08-01), Ullrich
patent: 3094695 (1963-06-01), Jahn
patent: 3369235 (1968-02-01), Odams et al.
patent: 3710255 (1973-01-01), Gicca
patent: 3789360 (1974-01-01), Clark, Jr. et al.
patent: 3815028 (1974-06-01), Rabow
patent: 3987444 (1976-10-01), Masak et al.
patent: 4063038 (1977-12-01), Kaul et al.

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