Spectrum sharing between broadcasting and multiple-access networks
First Claim
Patent Images
1. A wireless system comprising:
- a broadcast transmission operating within a certain frequency spectrum, said broadcast transmission operating at relatively high power;
a multiple-access transmission operating within said same certain frequency spectrum, each said multiple-access transmission at a significantly lower power level than said broadcast transmission; and
interference apparatus for canceling interference between said broadcast and multiple-access transmissions as seen by the respective receivers of both said broadcast and multiple-access transmissions.
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Accused Products
Abstract
Advantage is taken of the fact that broadcast coverage is unevenly distributed across a geographical region and multiple-access transmissions can be interposed in regions where interference is minimum. In one embodiment, advantage is taken of the known broadcasting signal and techniques, such as, for example, dirty paper coding techniques, can be used to pre-cancel broadcasting differences, allowing a system to operate as if the interference did not exist.
18 Citations
20 Claims
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1. A wireless system comprising:
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a broadcast transmission operating within a certain frequency spectrum, said broadcast transmission operating at relatively high power; a multiple-access transmission operating within said same certain frequency spectrum, each said multiple-access transmission at a significantly lower power level than said broadcast transmission; and interference apparatus for canceling interference between said broadcast and multiple-access transmissions as seen by the respective receivers of both said broadcast and multiple-access transmissions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless communication system comprising:
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a modulation scheme for controlling multiple access transmission from a base station to specific ones of mobile user terminals; and signal grooming circuitry for allowing said multiple access transmission to be acceptably received by said users even when broadcast signals are present in the same frequency spectrum as said transmission, acceptability being defined as a bit error rate less than a predefined threshold. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of operating a broadcast transmission system in a frequency spectrum that overlaps the frequency spectrum of a multiple-access, said method comprising:
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grooming said broadcast transmissions to remove interference from said multiple-access transmissions; and grooming said multiple-access transmissions to remove interference from said broadcast transmissions. - View Dependent Claims (14)
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15. A method for operating a wireless system, said method comprising:
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broadcasting RF transmissions at relatively high power within a certain frequency spectrum; broadcasting multiple-access RF transmissions within said same certain frequency spectrum, each said multiple-access RF transmissions broadcast at a significantly lower power level than said broadcast transmissions; and canceling interference between said broadcasted RF transmissions and said broadcasted multiple-access transmissions, said cancellations as seen by the respective receivers of both said broadcast and multiple-access RF transmissions. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification