Television distribution system and method using transmitting antennas on peripheries of adjacent cells within a service area

• US 5,729,825 A
• Filed: 03/24/1995
• Issued: 03/17/1998
• Est. Priority Date: 03/17/1995
• Status: Expired due to Term

• Current Assignee: Verizon Patent and Licensing Incorporated (Verizon Communications Inc.)
• Original Assignee: Bell Atlantic Network Services, Inc. (Verizon Communications Inc.)
• Inventors: Schneider, Allan, Kostreski, Bruce
• Primary Examiner(s): SIPOS, JOHN
• Application Number:
  US08/409,443
• Time in Patent Office: 1,089 Days
• US Class Current: 725/62
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04N 1/0035 User-machine interface; Control console input or output arrangements for computers G06F3/00
• CPC Class Codes: H04N 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4302 Content synchronisation processes, e.g. decoder synchronisation
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 7/025 Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame transmission of digital non-picture data during the vertical blanking interval only H04N7/088
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

A cellular system for distributing a plurality of television programs in a desired service area. A plurality of groups of spaced transmitting antennas are disposed substantially on the peripheries of adjacent cells disposed in the service area. The antennas are directional and directed to propagate substantially simulcast signals into the cell with which the antenna is associated so that the propagation patterns of the transmitting antennas associated with the cell overlaps over substantially a major portion of the area enclosed within the cell. Antennas disposed substantially on the peripheries of adjacent cells propagate directional signals into each of the adjacent cells. In a broadcast version the frequencies of the signals transmitted by all of the antennas are the same. In a dedicated service version the frequencies of the signals transmitted into adjacent cells are different. In the broadcast version an omni-directional antenna may be utilized in a centrally located disposition in the overall service area. The signals are broadcast as spread spectrum signals and the receivers include despreaders with Rake capabilities. Provision may be made for increasing the transmitted power of selected antennas to counteract adverse atmospheric conditions such as rain. The system may be used to provide video-on-demand and other interactive video services.

Claims

1. A system comprising:

a plurality of groups of spaced transmitting antennas disposed substantially on the peripheries of adjacent cells within a service area;

each of said transmitting antennas being directional and directed to propagate substantially simulcast broadband signals in a first directional pattern into at least the cell bounded by the periphery with which the antenna is associated;

the propagation patterns of the transmitting antennas of a cell with whose periphery they are associated being of a shape and extent so as to overlap over substantially a major portion of the area enclosed within said periphery;

plural receivers in each of multiple cells receiving multiple time separated versions of said broadband signals and having a signal processing device processing said versions of said broadband signals to provide a substantially single output signal; and

display devices connected to receive said substantially single output signal and provide a sensorially perceptible display corresponding to at least a portion of said substantially single output signal.

2. A system according to claim 1 wherein antennas disposed substantially on the peripheries of adjacent cells propagate signals into each of said adjacent cells in said directional patterns.

3. A system according to claim 2 wherein antennas disposed substantially on %he peripheries of three adjacent cells propagate signals into each of said three adjacent cells in said directional patterns.

4. A system according to claim 1 wherein said transmitted broadband signals are transmitted as spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

5. A system according to claim 1 wherein said transmitted broadband signals are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

6. A system according to claim 1 wherein said transmitted broadband signals are digitally modulated and are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

7. A system according to claim 1 wherein said transmitted broadband signals are digitally modulated and are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

8. A system according to claim 1 wherein said transmitted broadband signals include multiplexed channels each including multiplexed streams of digital broadband data.

9. A system according to claim 8 wherein said receivers include a demultiplexer, a decoder, and a demodulator.

10. A system according to claim 1 wherein said transmitted broadband signals include multiplexed channels each including multiplexed streams of digitally modulated digital broadband data transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders, Rake processing devices, demultiplexers, decoders, and demodulators.

11. A system according to claim 1 wherein the broadband signals transmitted by said antennas are simulcast.

12. A system according to claim 1 wherein said plural receivers are disposed in the overlap portions of the areas within said cells.

13. A system according to claim 1 wherein said antennas each transmit the broadband signal on the same frequency into adjacent cells.

14. A system according to claim 1 including signal strength sensors associated with at least certain of said cells, a transmitter connected to deliver a signal to be transmitted to at least one antenna associated with a cell having a sensor associated therewith, and said transmitter being responsive to a signal from a sensor indicating a decrease in signal strength to increase the power output of said transmitter to said at least one antenna associated with the sensor sensing the occurrence decrease in signal strength.

15. A system according to claim 2 wherein the broadband signals propagated into adjacent cells are at different frequencies.

16. A system according to claim 15 including a headend providing a source of different broadband signals subject to selection, customer premises where at least certain of said receivers are located, each customer premise where said certain receivers are located having a signaling device, at least a virtual link between said signaling devices and said headend communicating to the headend the identity broadband signal selected by a customer with a signaling device, said headend responsive to a communication identifying a selection delivering the selected broadband signal to at least one antenna transmitting a signal to the receiver located on the premise of said customer.

17. A system according to claim 16 wherein said link is established at least partially over the public switched telephone network.

39. A system as recited in claim 1, further comprising a unidirectional antenna disposed in a center of said service area and transmitting the same simulcast broadband signal into the serving area.

40. A system as recited in claim 39, wherein said transmitting antennas broadcast the same broadband signals.

41. A system as recited in claim 1, wherein said display devices each comprise a video display.

18. A system for distributing broadband program data to a service area comprising:

a plurality of groups of spaced transmitting antennas disposed substantially on the peripheries of adjacent cells within said service area;

each of said transmitting antennas being directional and directed to propagate substantially simulcast frequency hopping signals, each carrying the broadband program data, in a first directional pattern into the cell bounded by the periphery with which the antenna is associated and in a second directional pattern into an adjacent cell;

the propagation patterns of the transmitting antennas of a cell with whose periphery they are associated being of a shape and extent so as to overlap over substantially a major portion of the area enclosed within said periphery;

plural receivers in each of multiple cells receiving multiple time separated versions of said frequency hopping signals and having a despreader and Rake processing device processing said versions of said signals to provide a substantially single output signal carrying said broadband program data from each such receiver; and

display devices connected to receive said substantially single output signal and provide a sensorially perceptible display corresponding to at least a portion of said substantially single output signal.

19. A system according to claim 18 wherein said frequency hopping signals include multiplexed channels each including digitally multiplexed streams of said digital broadband program data, and wherein said receivers include a digital demultiplexer, a decoder, and a demodulator.

20. A system according to claim 19 wherein frequency hopping signals transmitted into adjacent cells are at the same frequency.

21. A system according to claim 19 wherein frequency hopping signals transmitted into adjacent cells are at different frequencies.

22. A system according to claim 19 including signal strength sensors associated with at least certain of said cells, a transmitter connected to deliver a signal to be transmitted to at least one antenna associated with a cell having a signal strength sensor associated therewith, and said transmitter being responsive to a signal from a signal strength sensor indicating a decrease in signal strength to increase the power output of said transmitter to said at least one antenna associated with the signal strength sensor sensing the signal strength decrease.

23. A system according to claim 19 including a headend providing a source of different broadband program data subject to selection, customer premises where at least certain of said receivers are located, each customer premise where said certain receivers are located having a signaling device, at least a virtual link between said signaling devices and said headend communicating to the headend the identity of one of the different broadband program data selected by a customer with a signaling device, said headend responsive to a communication identifying a selection delivering the selected broadband program data to at least one antenna transmitting a signal to the receiver located on the premise of said customer.

24. A system according to claim 23 wherein said link is established at least partially over the public switched telephone network.

25. In a cellular system for distributing a wireless signal to a service area the method comprising the steps of:

a) substantially simulcasting into cells in said service area from plural transmitting antennas disposed substantially on the periphery of the cells directional signals directed from the antennas disposed on the periphery of a cell into said cell so that the propagation patterns of said antennas in said cell overlap over substantially a major portion of the area of said cell;

b) transmitting said directional signals from said antennas into said cells as spread spectrum signals carrying broadband information;

c) receiving said spread spectrum signals at plural receivers located in at least one of said cells in the area of overlap of said propagation patterns including receiving a time delayed version of one of the spread spectrum signals;

d) processing at least a portion of the received signals to acquire a single copy thereof; and

e) presenting the broadband information contained in the acquired signal to a user in sensorially perceptible form.

26. A method according to claim 25 including the step of transmitting from antennas substantially on the peripheries of adjacent cells in plural directional patterns into said adjacent cells.

27. A method according to claim 26 including the steps of receiving said spread spectrum signals at plural receivers located in each of said adjacent cells in the area of overlap of said propagation patterns in said cells.

28. A method according to claim 27 wherein said signals are transmitted into said spread spectrum adjacent cells at the same frequency.

29. A method according to claim 27 wherein said signals are transmitted into said spread spectrum adjacent cells at different frequencies.

30. A method according to claim 25 including the steps of:

transmitting said spread spectrum signals as frequency hopped spread spectrum signals; and

processing the received signals with Rake processing techniques.

31. A method according to claim 30 including the step of transmitting from antennas substantially on the peripheries of adjacent cells in plural directional patterns into said adjacent cells.

32. A method according to claim 31 including the steps of receiving said spread spectrum signals at plural receivers located in each of said adjacent cells in the area of overlap of said propagation patterns in said cells.

33. A method according to claim 32 wherein said spread spectrum signals are transmitted into said adjacent cells at the same frequency.

34. A method according to claim 33 wherein said spread spectrum signals are transmitted into said adjacent cells at different frequencies.

35. A method according to claim 25 including the steps of:

sensing rain substantially at a transmitting antenna; and

increasing the power transmitted by said antenna.

36. A method according to claim 25 including the step of transmitting into plural cells from a substantially omni-directional antenna the same signals as are transmitted into said cells by said directional antennas.

37. A method according to claim 25 wherein said spread spectrum signals transmitted from said transmitting antennas include frequency multiplexed channels each including multiplexed streams of digital data in digitally compressed form.

38. A method according to claim 37 including the steps of selecting with at least one of said receivers one of said frequency multiplexed channels and from the compressed multiplexed stream of digital data in that channel selecting one set of said digital data;

and displaying said data.

42. A system comprising:

a plurality of groups of spaced directional antennas disposed substantially on the peripheries of adjacent cells within a service area, said directional antennas propagating substantially simulcast signals in a first directional pattern into at least the cell bounded by the periphery with which the antenna is associated;

the propagation patterns of the directional antennas of a cell with whose periphery they are associated being of a shape and extent so as to overlap over substantially a major portion of the area enclosed within said periphery;

an omnidirectional antenna disposed at a center of said service area and propagating said substantially simulcast signals in a unidirectional pattern into said cells within said service area;

plural receivers in each of multiple cells receiving multiple time separated versions of said signals and having a signal processing device processing said versions of said signals to provide a substantially single output signal; and

display devices connected to receive said substantially single output signal and provide a sensorially perceptible display corresponding to at least a portion of said substantially single output signal.

43. A system as in claim 42, wherein antennas disposed substantially on the peripheries of adjacent cells propagate signals into each of said adjacent cells in said directional patterns.

44. A system according to claim 43 wherein antennas disposed substantially on the peripheries of three adjacent cells propagate signals into each of said three adjacent cells in said directional patterns.

45. A system according to claim 42 wherein said transmitted signals are transmitted as spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

46. A system according to claim 42 wherein said transmitted signals are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

47. A system according to claim 42 wherein said transmitted signals are digitally modulated and are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

48. A system according to claim 42 wherein said transmitted signals are QAM digitally modulated and are transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders and Rake processing devices.

49. A system according to claim 42 wherein said transmitted signals include multiplexed channels each including multiplexed streams of digital data.

50. A system according to claim 49 wherein said receivers include a demultiplexer, a decoder, and a demodulator.

51. A system according to claim 42 wherein said transmitted signals include multiplexed channels each including multiplexed streams of digitally modulated digital data transmitted as frequency hopping spread spectrum signals and said receiver signal processing devices comprise despreaders, Rake processing devices, demultiplexers, decoders, and demodulators.

52. A system according to claim 42 wherein the signals transmitted by said antennas are simulcast.

53. A system comprising:

a plurality of groups of spaced transmitting antennas disposed substantially on the peripheries of adjacent cells within a service area;

each of said transmitting antennas being directional and directed to propagate and substantially simulcast the same signals in a first directional pattern into at least the cell bounded by the periphery with which the antenna is associated, each of said cells in the service area receiving said same signals;

the propagation patterns of the transmitting antennas of a cell with whose periphery they are associated being of a shape and extent so as to overlap over substantially a major portion of the area enclosed within said periphery;

plural receivers in each of multiple cells receiving multiple time separated versions of said same signals and having a signal processing device processing said versions of said same signals to provide a substantially single output signal; and

display devices connected to receive said substantially single output signal and provide a sensorially perceptible display corresponding to at least a portion of said substantially single output signal.

54. A system as recited in claim 53, wherein said same signals each comprise the same broadband data.

55. A system as recited in claim 53, wherein said same signals each comprise digital video data.

56. A system as in claim 53, wherein said same signals include multiplexed channels each including multiplexed streams of digital data.