Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals

• US 7,853,197 B2
• Filed: 11/30/2005
• Issued: 12/14/2010
• Est. Priority Date: 10/11/1996
• Status: Expired due to Fees

• Current Assignee: Broadband Investments Limited
• Original Assignee: Carmen Tawil, Saleem Tawil
• Inventors: Tawil, Saleem, Tawil, Carmen
• Primary Examiner(s): Vuong; Quochien B
• Application Number:
  US11/289,864
• Publication Number:
  US 20060079176A1
• Time in Patent Office: 1,840 Days
• Field of Search: 455/3.01, 455/3.02, 455/12.1, 455/13.3, 455/63.1, 455/179.1, 455/188.1, 455/272, 455/427, 455/430, 455/561, 455/562.1, 725/63, 725/67, 725/68
• US Class Current: 455/3.02
• CPC Class Codes: H04B 7/18523 Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service arrangements specially adapted for satellite broadcast receiving H04H40/90; picture transmission via satellite H04N1/00103; television transmission via satellite H04N7/20
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

A satellite receiving antenna at a user location receives satellite signals at a first frequency from a satellite. The satellite signals travel along a satellite signal route encompassed within an aperture of the satellite receiving antenna. A terrestrial transmitter transmits signals at the first frequency along a wireless transmission route from the transmitter to the user location. The terrestrial transmitter is located with respect to the user location so that the wireless transmission route is outside of the aperture of the satellite receiving antenna. Also the terrestrial transmission power is controlled so that the terrestrial signals present at the user location result in terrestrial input signals from the satellite receiving antenna which are below an interference signal power level with respect to satellite input signals produced by the satellite receiving antenna. Thus, the terrestrial signals do not interfere with the satellite signals even though they are transmitted at a common frequency. However, the terrestrial signals are maintained at a power level at the user location such that information may be extracted from terrestrial signals.

Claims

1. A method for reusing a first transmission frequency already in use for transmitting satellite signals from a satellite along a satellite signal route to a first location for reception with a satellite receiving antenna which is physically oriented at the first location with an aperture of the satellite receiving antenna encompassing the satellite signal route to the first location, the satellite signals having a signal power level at the first location to produce satellite input signals at least at a minimum usable satellite input signal level when received within the aperture of the satellite receiving antenna at the first user location, the method comprising the step of:

(a) transmitting terrestrial signals at the first transmission frequency from a first terrestrial transmitter, the terrestrial signals being transmitted in directions including a wireless transmission route from the first terrestrial transmitter to the first location, the wireless transmission route lying at an angle from the satellite signal route such that the terrestrial signals present at the first location produce terrestrial input signals from the satellite receiving antenna that has been physically oriented to receive the satellite signals within the aperture of the satellite receiving antenna, the terrestrial input signals being at a power level less than an interference power level with respect to the satellite input signals, and the terrestrial signals present at the first location also having a power level at least at a minimum usable terrestrial signal level.

2. The method of claim 1 wherein the satellite receiving antenna is a dish-type antenna.

3. The method of claim 1 wherein the satellite transmits satellite signals along a satellite signal route to a second location for reception with a satellite receiving antenna which is physically oriented at the second location with an aperture of the satellite receiving antenna at the second location encompassing the satellite signal route to the second location, the satellite signals having a signal power level at the second location to produce satellite input signals at least at a minimum usable satellite input signal level when received within the aperture of the satellite receiving antenna at the second location, and wherein the method further comprises the step of:

(a) transmitting second terrestrial signals at the first transmission frequency from a second terrestrial transmitter along a second wireless transmission route to the second location, the second terrestrial transmitter having an effective transmission area which is different from an effective transmission area for the first terrestrial transmitter, the second wireless transmission route lying at an angle from the satellite signal route to the second location such that the second terrestrial signals present at the second location produce second terrestrial input signals from the satellite receiving antenna that has been physically oriented at the second location to receive the satellite signals within the aperture thereof, the second terrestrial input signals being at a power level less than an interference power level with respect to the satellite input signals at the second location, and the second terrestrial signals present at the second location also having a power level at least at the minimum usable terrestrial signal level.

4. The method of claim 3 wherein the first terrestrial transmitter and the second terrestrial transmitter simultaneously transmit the same data at the first transmission frequency.

5. The method of claim 3 wherein the effective transmission area of the first terrestrial transmitter overlaps with the effective transmission area of the second terrestrial transmitter.

6. The method of claim 3 wherein:

(a) the effective transmission area of the first terrestrial transmitter and the effective transmission area of the second terrestrial transmitter do not overlap; and

(b) the first terrestrial transmitter and the second terrestrial transmitter simultaneously transmit different data at the first transmission frequency.

7. The method of claim 1 wherein the satellite transmits satellite signals along a satellite signal route to a second location for reception with a satellite receiving antenna which is physically oriented at the second location with an aperture of the satellite receiving antenna at the second location encompassing the satellite signal route to the second location, the satellite signals having a signal power level at the second location to produce satellite input signals at least at a minimum usable satellite input signal level when received within the aperture of the satellite receiving antenna at the second location, and wherein the method further comprises the step of:

(a) transmitting the terrestrial signals at the first transmission frequency from the first terrestrial transmitter along a second wireless transmission route to the second location, the second wireless transmission route lying at an angle from the satellite signal route to the second location such that the terrestrial signals present at the second location produce terrestrial input signals from the satellite receiving antenna which has been physically oriented at the second location to receive the satellite signals within the aperture thereof, the second terrestrial input signals being at a power level less than an interference power level with respect to the satellite input signals at the second location, and the second terrestrial signals present at the second location also having a power level at least at the minimum usable terrestrial signal level.

8. An apparatus for simultaneously providing terrestrially transmitted signals on a common frequency with satellite signals transmitted from a satellite along a satellite signal route to a first location, the satellite signals being transmitted at a first frequency and having a signal power level at the first location to produce satellite input signals at least at a minimum usable satellite input signal level when received with a satellite receiving antenna physically oriented at the first location in a satellite reception position in which an aperture of the satellite receiving antenna encompasses the satellite signal route to the first location, the apparatus comprising:

(a) a first terrestrial transmitter for transmitting terrestrial signals at the first frequency along a wireless transmission route from a first terrestrial transmitter location to the first location, the wireless transmission route lying at an angle from the satellite signal route such that the terrestrial signals present at the first location produce terrestrial input signals from the satellite receiving antenna oriented in the satellite reception position at the first location, the terrestrial input signals being at a power level less than an interference level with respect to the satellite input signals, the terrestrial signals present at the first location also having a power level at least at a minimum usable terrestrial signal level.

9. The apparatus of claim 8 wherein the first terrestrial transmitter transmits along a plurality of wireless transmission routes from the first terrestrial transmitter, each wireless transmission route lying at an angle to a satellite signal route from the satellite to a location along the respective wireless transmission route, the angle to the respective satellite signal route being such that the terrestrial signals present at the respective location along the wireless transmission route produce terrestrial input signals from a respective satellite receiving antenna physically oriented at the respective location with an aperture of the respective satellite receiving antenna encompassing the satellite signal route to the respective location, the terrestrial input signals from the respective satellite receiving antenna being at a power level less than the interference level with respect to satellite input signals produced from the satellite signals received at the respective satellite receiving antenna at the respective location.

10. The apparatus of claim 8 further comprising a second terrestrial transmitter at a second transmitter location for transmitting terrestrial signals at the first frequency, the second terrestrial transmitter having an effective transmission area which is different from an effective transmission area for the first terrestrial transmitter.

11. The apparatus of claim 10 wherein the effective transmission area of the first terrestrial transmitter overlaps with the effective transmission area of the second terrestrial transmitter.

12. The apparatus of claim 10 wherein:

(a) the effective transmission area of the first terrestrial transmitter and the effective transmission area of the second terrestrial transmitter do not overlap; and

(b) the first terrestrial transmitter and the second terrestrial transmitter simultaneously transmit different data at the first frequency.

13. A method for reusing a first transmission frequency already in use for transmitting satellite signals from a satellite along a satellite signal route to a first location for reception with a satellite receiving antenna which is physically oriented at the first location with an aperture of the satellite receiving antenna encompassing the satellite signal route to the first location, the satellite signals having a sufficient signal power level at the first location to result in satellite input signals from the satellite receiving antenna which are at least at a minimum usable satellite input signal level, the method comprising the steps of:

(a) transmitting terrestrial signals at the first transmission frequency from a first terrestrial transmitter to the first location, the terrestrial signals present at the first location resulting in terrestrial input signals from the satellite receiving antenna such that the satellite input signals at the satellite receiving antenna are distinguishable from the terrestrial input signals; and

(b) receiving the terrestrial signals with a terrestrial receiving antenna at the first location to produce terrestrial input signals from the terrestrial receiving antenna which are distinguishable from any satellite input signals at the terrestrial receiving antenna resulting from satellite signals transmitted from the satellite to the first location.

14. An apparatus for simultaneously transmitting terrestrial signals on a common frequency with satellite signals transmitted from a satellite, the satellite transmitting satellite signals at a first frequency along a satellite signal route to a first location for reception with a satellite receiving antenna which is physically oriented at the first location with an aperture of the satellite receiving antenna encompassing the satellite signal route to the first location, the satellite signals having a signal power level at the first location to produce satellite input signals at least at a minimum usable satellite input signal level when received within the aperture of the satellite receiving antenna, the apparatus comprising:

(a) a terrestrial transmitter for transmitting terrestrial signals at the first frequency to the first location from a fixed terrestrial location which forms a fixed geometry with the first location and the satellite, the terrestrial transmitter being located with respect to the first location such that the terrestrial signals present at the first location result in terrestrial input signals from the satellite receiving antenna at the first location which are at a power level less than an interference power level with respect to the satellite input signals produced by the satellite receiving antenna at the first location; and

(b) a terrestrial receiving antenna at the first location, the terrestrial receiving antenna receiving the terrestrial signals transmitted from the terrestrial transmitter to produce terrestrial input signals which are distinguishable from any satellite input signals at the terrestrial receiving antenna resulting from satellite signals transmitted from the satellite to the first location.