Same frequency satellite terrestrial radio broadcast
First Claim
1. A digital wireless broadcast system, comprising:
- a plurality of ground stations respectively configured to wirelessly transmit a digital symbol stream over a frequency spectrum to corresponding plurality of service areas; and
a satellite configured to wirelessly transmit the digital symbol stream over the frequency spectrum to the plurality of service areas,wherein the plurality of ground stations are configured such that the digital symbol stream from each ground station and the digital symbol stream from the satellite arrive within a predetermined time period of each other in each corresponding service area,wherein the predetermined time period is a relative delay between the digital symbol stream from the satellite and from the ground station that is within a range for which a receiver in the corresponding service area is capable of decoding the digital symbol stream, andwherein the plurality of ground stations are configured such that a timing of the digital symbol stream transmission from at least one ground station is independently controllable from a timing of the digital symbol stream transmission from at least one other ground station.
1 Assignment
0 Petitions
Accused Products
Abstract
A satellite broadcasts radio programs to mobile and fixed receivers at various locations. Ground stations supplement the satellite broadcasts in areas where the satellite signal may be shadowed. Likewise, the satellite signal supplements the terrestrial transmissions in areas with marginal terrestrial signal strength. Ground stations and a satellite transmit the same digital symbol stream over a same frequency spectrum. The symbol streams arrive in each service area of the ground stations with a relative delay that is within a window for which a receiver is adapted to decode efficiently. Spectral efficiency is achieved by allowing the ground stations to share the same frequencies as the satellites.
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Citations
29 Claims
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1. A digital wireless broadcast system, comprising:
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a plurality of ground stations respectively configured to wirelessly transmit a digital symbol stream over a frequency spectrum to corresponding plurality of service areas; and a satellite configured to wirelessly transmit the digital symbol stream over the frequency spectrum to the plurality of service areas, wherein the plurality of ground stations are configured such that the digital symbol stream from each ground station and the digital symbol stream from the satellite arrive within a predetermined time period of each other in each corresponding service area, wherein the predetermined time period is a relative delay between the digital symbol stream from the satellite and from the ground station that is within a range for which a receiver in the corresponding service area is capable of decoding the digital symbol stream, and wherein the plurality of ground stations are configured such that a timing of the digital symbol stream transmission from at least one ground station is independently controllable from a timing of the digital symbol stream transmission from at least one other ground station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26)
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13. A digital wireless broadcast system, comprising:
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a first satellite configured to transmit a digital symbol stream over first a frequency spectrum to a first service area; and a second satellite configured to transmit the digital symbol stream over the first frequency spectrum to the first service area, wherein the first and second satellites are configured such that the digital symbol stream from the first and second satellites arrive in the first service area within a predetermined time period of each other, wherein the predetermined time period is a relative delay between the digital symbol stream from the first and second satellites that is within a range for which a receiver in the first service area is capable of decoding the digital symbol stream, and wherein the first and second satellites are both configured to transmit the digital symbol stream over a second frequency spectrum to a second service area such that the digital symbol stream from the first and second satellites arrive in the second service area within the predetermined time period of each other.
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14. A digital wireless broadcast system, comprising:
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a first satellite configured to transmit a digital symbol stream over a frequency spectrum to a first service area; and a second satellite configured to transmit the digital symbol stream over the frequency spectrum to the first service area, wherein the first and second satellites are configured such that the digital symbol stream from the first and second satellites arrive in the first service area within a predetermined time period of each other, wherein the predetermined time period is a relative delay between the digital symbol stream from the first and second satellites that is within a range for which a receiver in the first service area is capable of decoding the digital symbol stream, wherein the first and second satellites are each configured to transmit the digital symbol stream over the frequency spectrum to a second service area such that the digital symbol stream from the first and second satellites arrive in the second service area within the predetermined time period of each other, and wherein at least one of the following applies; the first and second satellites each transmit the digital symbol stream using first and second directed beams to the corresponding the first and second areas, and the first and second satellites each transmit the digital symbol stream using first and second polarizations to the corresponding the first and second areas.
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15. A digital wireless broadcast method, comprising:
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wirelessly transmitting, from a plurality of ground stations, a digital symbol stream over a frequency spectrum to corresponding plurality of service areas; and wirelessly transmitting, from a satellite, the digital symbol stream over the frequency spectrum to the plurality of service areas, wherein the digital symbol stream from each ground station and the digital symbol stream from the satellite arrive within a predetermined time period of each other in each corresponding service area, wherein the predetermined time period is a relative delay between the digital symbol stream from the satellite and from the ground station that is within a range for which a receiver in the corresponding service area is capable of decoding the digital symbol stream, and wherein a timing of the digital symbol stream transmission from at least one ground station is independently controlled from a timing of the digital symbol stream transmission from at least one other ground station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 27, 28)
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24. A digital wireless broadcast method, comprising:
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transmitting, from a first satellite, a digital symbol stream over a first frequency spectrum to a first service area and over a second frequency spectrum to a second service area; transmitting, from a second satellite, the digital symbol stream over the first frequency spectrum to the first service area and over the second frequency spectrum to the second service area, wherein the digital symbol streams from the first and second satellites arrive to a receiver in the first service area within a predetermined time period of each other, wherein the digital symbol streams from the first and second satellites arrive to a receiver in the second service area within the predetermined time period of each other, and wherein the predetermined time period is a relative delay between the digital symbol stream from the first and second satellites that is within a range for which the receiver is capable of decoding the digital symbol stream.
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29. A digital wireless broadcast method, comprising:
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transmitting, from a first satellite, a digital symbol stream over a frequency spectrum to a first service area and over the frequency spectrum to a second service area; transmitting, from a second satellite, the digital symbol stream over the frequency spectrum to the terrestrial first service area and over the frequency spectrum to the second service area, wherein the digital symbol streams from the first and second satellites arrive to a receiver in the first service area within a predetermined time period of each other, wherein the digital symbol streams from the first and second satellites arrive to a receiver in the second service area within the predetermined time period of each other, wherein the predetermined time period is a relative delay between the digital symbol stream from the first and second satellites that is within a range for which the receiver is capable of decoding the digital symbol stream, wherein at least one of the following applies; the first and second satellites each transmit the digital symbol stream using first and second directed beams to the corresponding the first and second areas, and the first and second satellites each transmit the digital symbol stream using first and second polarizations to the corresponding the first and second areas.
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Specification