Reconfigurable notched spectrum for wireless data transmission
AssigneeThe DIRECTV Group, Inc.
InventorJohn L. Norin
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Abstract
Systems and methods for communication are disclosed. A system in accordance with the present invention comprises a communications system, comprising at least one transmitter station and at least one receiver station, the transmitter station and receiver station communicating using an Orthogonal Frequency Division Multiplexing (OFDM) schema, wherein OFDM signals are transmitted in a notched frequency band arrangement such that at least one other transmission within a notch of the notched frequency band is used outside of the communications system.
Claims19
An Orthogonal Frequency Division Multiplexing communications system, comprising:
- at least one transmitter station;
- and
- at least one receiver station, the at least one transmitter station and the at least one receiver station communicating using an Orthogonal Frequency Division Multiplexing (OFDM) schema, wherein OFDM signals are transmitted only in a notched frequency band arrangement within a continuous frequency spectrum such that at least one other transmission outside a predetermined notch of the notched frequency band arrangement is used by a separate communications system other than the OFDM communications system, and each notch of the notched frequency band arrangement is used by the OFDM schema to transmit at least one subcarrier of the OFDM schema.
A communications method, comprising:
- preparing Orthogonal Frequency Division Multiplexed (OFDM) signals in a continuous frequency band of interest;
- notching the continuous frequency band of interest such that transmissions by a separate communications system are blocked within at least one predetermined notch of the continuous frequency band of interest;
- transmitting the OFDM signals from a transmitter in the continuous frequency band of interest through the notched continuous frequency band of interest, wherein the OFDM signals are transmitted in the continuous frequency band of interest within the at least one predetermined notch and each notch of the notched continuous frequency band of interest is used to transmit at least one sub-carrier of the OFDM signals;
- and
- receiving the OFDM signals at a receiver.
A communications system, comprising:
- a plurality of receivers, each receiver in the plurality of receivers designed to receive signals in a continuous frequency spectrum;
- and
- at least one base station, wherein the at least one base station transmits at least one signal within the continuous frequency spectrum, the at least one signal transmitted within a plurality of predetermined notches of the continuous frequency spectrum shared with other communications systems, the at least one base station being configured such that the at least one base station transmits the at least one signal only in the plurality of predetermined notches within the continuous frequency spectrum wherein at least one other communications system transmits within the continuous frequency spectrum and outside the plurality of predetermined notches, and each notch in the plurality of predetermined notches of the notched continuous frequency spectrum is used by the at least one base station to transmit at least one sub-carrier of the communications system.
Dependencies are inferred from the claim text.