Data communication system using spectral overlay

Details Data communication system using spectral overlay Data communication system using spectral overlay

H - Electricity

04

Q

H04Q 7/22 (2006.01)

Patent

CA 2143376

A data communication system is provided for use with a cellular system containing an array of cells and a cellular transmitter/receiver located within each cell of the array. Each cellular transmitter/receiver is adapted for transmitting and receiving voice and/or data communication over predetermined channelized frequencies associated with the particular cell in which the cellular transmitter/receiver is located. In accordance with the invention a base data transmission station is located in each cell and is adapted for transmitting a single data stream across a plurality of channels, each of which channels is adapted to carry a single stream of information. Each base data transmitting station does not transmit on the predetermined channels that are assigned to the particular cell in which the base data transmitting station is located (i.e., those channels are "notched"). In one embodiment used channels that are carrying streams of information in adjacent cells are detected and the base data transmission station does not transmit over the frequencies of the used channels (i.e., the used channels are "notched"). In this manner, the single data stream transmitted by the base data transmitting station is transmitted over all of the channels of the cellular array except for the channels that are notched. The base data transmitting station also transmits a notching pattern, which is continuously updated, to mobile transmitters within the cell. The notching pattern comprises information concerning the channels in the cell that are notched and information concerning used channels of adjacent cells that are notched. The mobile transmitters in the cell will transmit a single data stream over all of the plurality of channels of the cellular array except for the notched channels.

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