WO1998008345B1 - System for use in television roll-off band channels for data transfer over a network - Google Patents
System for use in television roll-off band channels for data transfer over a networkInfo
- Publication number
- WO1998008345B1 WO1998008345B1 PCT/US1997/014794 US9714794W WO9808345B1 WO 1998008345 B1 WO1998008345 B1 WO 1998008345B1 US 9714794 W US9714794 W US 9714794W WO 9808345 B1 WO9808345 B1 WO 9808345B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- client
- signal
- signals
- improvement
- upconverter
- Prior art date
Links
- 230000000051 modifying Effects 0.000 claims abstract 62
- 238000001228 spectrum Methods 0.000 claims abstract 19
- 230000005540 biological transmission Effects 0.000 claims abstract 7
- 238000011144 upstream manufacturing Methods 0.000 claims 22
- 238000011084 recovery Methods 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract 1
Abstract
An apparatus and method for utilizing the roll-off spectrum of TV transceiver equipment by channelizing wide band data-carrying signals into multiple subchannels. The system comprises a plurality of modulators (121A, 121B, 121C), filters (124A, 124B, 124C, 126), and an upconverter enables insertion of data channels into a transmission scheme without occupying video channels. In particular, the apparatus and method functions to transmit 2MHz subchannels of data at roll-off band frequencies to at least one client in a two-way, asymmetric network communication system.
Claims
1. A roll-off band channelizing apparatus for use with a high speed, digital network including a television headend that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum for transmission of data to at least one client, said apparatus comprising: a modulator, said modulator modulating a digital data stream into a modulated signal; an RF upconverter, said RF upconverter upconvertiπg said modulated signal to an RF frequency above or below said allocated spectrum, wherein said upconverted modulated signal has a bandwidth that carries data closely approximating the data receiving capacity of said client.
2. An apparatus as in claim 1, wherein said upconverted modulated signal is approximately 2 MHZ in bandwidth.
3. An apparatus as in claim 1 , wherein a bit rate of said digital data stream is approximately 10Mbits/sec.
4. An apparatus as in claim 1 , wherein said modulator quadrature amplitude modulates said digital data stream.
5. An apparatus as in claim 4, wherein said RF upconverter comprises: a first upconverter, said first upconverter upconvertiπg said modulated signal to an IF signal; and a second upconverter, said second upconverter upcoπverting said IF signal to said RF frequency.
6. An apparatus as in claim 1, wherein said modulator vestigial sideband modulates said digital data stream.
7. A data recovery apparatus for use with a high speed, digital network including a television headend that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum for transmission of digital data to at least one client, said apparatus comprising: a tuner, said tuner tuning to a radio frequency (RF) signal residing at an RF" frequency above or below said allocated spectrum, wherein said signal has a bandwidth that carries data closely approximating the data receiving capacity of said client.; a first downconverter, said first downconverter downconverting said RF signal to an intermediate frequency (IF) signal; a demodulator, said demodulator demodulating said IF signal and recovering said digital data.
8. An apparatus as in claim 7, wherein said RF signal is approximately 2 MHZ in bandwidth.
9. An apparatus as in claim 7, wherein a bit rate of said digital data is approximately 10Mbits/sec.
10. An apparatus as in claim 7, wherein said demodulator comprises a sync detector.
11. An apparatus as in claim 7, wherein said demodulator comprises: a second downconverter, said second downconverter downconverting said IF signal to a baseband signal; and a baseband sampler, said baseband sampler recovering said digital data from said baseband signal.
12. In a network having a television headend that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum to communicate high speed digital data to at least one client, the improvement comprising: a medium, said medium transporting RF signals to said at least one client; a plurality of modulators, said modulators each modulating a respective portion of said digital data into a plurality of modulated signals; an RF upconverter, said RF upconverter upconverting said modulated signals to RF signals residing at a frequency above or below said allocated spectrum and placing said RF signals on said medium, wherein said upconverted modulated signals have a bandwidth that carries data closely approximating the data receiving capacity of said client; a tuner, said tuner tuning to one of said RF signals on said medium; a first downconverter, said first downconverter downconverting said one of said RF signals to an IF signal; and a demodulator, said demodulator demodulating said IF signal and approximately recovering a respective portion of said digital data.
13. An improvement as in claim 12, wherein each of said RF signals is approximately 2 MHZ in bandwidth.
14. An improvement as in claim 12, wherein a bit rate of each of said respective portions of said digital data is approximately 10Mbits/sec.
15. An improvement as in claim 12, wherein said plurality of modulators quadrature amplitude modulate said digital data.
16. An improvement as in claim 15, wherein said RF upconverter comprises: a first plurality of upconverters for upconvertiπg said modulated signals to IF signals; and a second upconverter for upconverting said IF signals to said RF signals.
17. An improvement as in claim 12, wherein said plurality of modulators vestigial sideband modulate said digital data.
18. An improvement as in claim 17, wherein said demodulator comprises a sync detector.
19. An improvement as in claim 16, wherein said demodulator comprises: a second downconverter, said second downconverter downconverting said IF signal to a baseband signal; and a baseband sampler, said baseband sampler recovering said digital data from said baseband signal.
20. An improvement as in claim 12, further comprising: a client modulator, said client modulator modulating client data, said client data having a lower bit rate than said respective portion of said digital data; a client RF upconverter, said client RF upconverter upconverting said modulated client data to a client RF signal residing on an RF frequency above that of a highest television channel said television headend is equipped to utilize or below 54MHz; an upstream tuner, said upstream tuner tuning to said client RF signal; an upstream downconverter, said upstream downconverter downconverting said client RF signal to a client IF signal; and an upstream demodulator, said upstream demodulator demodulating said client IF signal and approximately recovering said client data.
21. An improvement as in claim 20, wherein said client RF upconverter places said client RF signal upon said medium and said upstream tuner tunes to said client RF signal upon said medium.
22. In a hybrid access system including a television headend that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum to communicate high speed digital data to at least one client, the improvement comprising: a medium, said medium transporting RF signals to said at least one client; a plurality of modulators, said modulators each modulating a respective portion of said digital data into a plurality of modulated signals; a radio frequency (RF) upconverter, said RF upconverter upconverting said modulated signals to RF signals residing at a frequency above or below said allocated spectrum and placing said RF signals on said medium, wherein said upconverted modulated signals have a bandwidth that carries data closely approximating the data receiving capacity of said client; a tuner, said tuner tuning to one of said RF signals on said medium; a first downconverter, said first downconverter downconverting said one of said RF signals to an IF signal; and a demodulator, said demodulator demodulating said IF signal and approximately recovering a respective portion of said digital data.
23. An improvement as in claim 22, wherein each of RF signals said is approximately 2 MHZ in bandwidth.
24. An improvement as in claim 22, wherein a bit rate of each of said respective portions of said digital data is approximately 10Mbits/sec.
25. An improvement as in claim 22, wherein said plurality of modulators quadrature amplitude modulate said digital data.
26. An improvement as in claim 25, wherein said RF upconverter comprises: a first plurality of upconverters for upconverting said modulated signals to IF signals; and a second upconverter for upconverting said IF signals to said RF signals.
27. An improvement as in claim 22, wherein said plurality of modulators vestigial sideband modulate said digital data.
28. An improvement as in claim 27, wherein said demodulator comprises a sync detector.
29. An improvement as in claim 26, wherein said demodulator comprises: a second downconverter, said second downconverter downconverting said IF signal to a baseband signal; and a baseband sampler, said baseband sampler recovering said digital data from said baseband signal.
30. An improvement as in claim 22, further comprising: a client modulator, said client modulator modulating client data, said client data having a lower bit rate than said respective portion of said digital data; a client RF upconverter, said client RF upconverter upconverting said modulated client data to a client RF signal residing on an RF frequency above that of a highest television channel said television headend is equipped to utilize or below 54MHz; an upstream tuner, said upstream tuner tuning to said client RF signal, an upstream downconverter, said upstream downconverter downconverting said client RF signal to a client IF signal; and an upstream demodulator, said upstream demodulator demodulating said client IF signal and approximately recovering said client data.
31. An improvement as in claim 30, wherein said client RF upconverter places said client RF signal upon said medium and said upstream tuner tunes to said client RF signal upon said medium.
32. In a high speed, asymmetric, two way communication system including a television headend that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum to communicate high speed digital data in a downstream direction to at least one client, the improvement comprising: a medium, said medium transporting RF signals to said at least one client; a plurality of modulators, said modulators each modulating a respective portion of said digital data into a plurality of modulated signals; an RF upconverter, said RF upconverter upconverting said modulated signals to RF signals residing at a frequency above or below said allocated spectrum and placing said RF signals on said medium, wherein said upconverted modulated signals have a bandwidth that carries data closely approximating the data receiving capacity of said client; a client tuner, said client tuner tuning to one of said RF signals on said medium; a first client downconverter, said first client downconverter downconverting said one of said RF signals to an IF signal; and a client demodulator, said client demodulator demodulating said IF signal and approximately recovering a respective portion of said digital data.
33. An improvement as in claim 32, wherein each of said RF signals is approximately 2 MHZ in bandwidth.
34. An improvement as in claim 32, wherein a bit rate of each of said respective portions of said digital data is approximately 10Mbits/sec.
35. An improvement as in claim 32, wherein said plurality of modulators quadrature amplitude modulate said digital data.
36. An improvement as in claim 35, wherein said RF upconverter comprises: a first plurality of upconverters for upconverting said modulated signals to IF signals; and a second upconverter for upconverting said IF signals to said RF signals.
37. An improvement as in claim 32, wherein said plurality of modulators vestigial sideband modulate said digital data.
38. An improvement as in claim 37, wherein said client demodulator comprises a sync detector.
39. An improvement as in claim 36, wherein said client demodulator comprises: a second downconverter, said second downconverter downconverting said IF signal to a baseband signal; and a baseband sampler, said baseband sampler recovering said digital data from said baseband signal.
40. An improvement as in claim 32, further comprising: a client modulator, said client modulator modulating client data for transmission in an upstream direction, said client data having a lower bit rate than said respective portion of said digital data; a client RF upconverter, said client RF upconverter upconverting said modulated client data to a client RF signal residing on an RF frequency above that of a highest television channel said television headend is equipped to utilize or below 54MHz; an upstream tuner, said upstream tuner tuning to said client RF signal; an upstream downconverter, said upstream downconverter downconverting said client RF signal to a client IF signal; and an upstream demodulator, said upstream demodulator demodulating said client IF signal and approximately recovering said client data.
41. An improvement as in claim 40, wherein said client RF upconverter places said client RF signal upon said medium and said upstream tuner tunes to said client RF signal upon said medium.
42. A method for providing for transmission of highspeed digital information by a television headend in a high speed, asymmetric, digital information transmission system that operates within an allocated television spectrum and utilizing at least a portion of a radio frequency (RF) spectrum without said television headend utilizing an existing television channel for the transmission of high speed digital information comprising: modulating digital information; transmitting said modulated information at an RF frequency above or below said allocated spectrum, wherein said modulated information has a bandwidth that carries data closely approximating the data receiving capacity of a client.
43.A method as in claim 42, wherein said modulated information is in a range of 2 MHZ in bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU47994/97A AU4799497A (en) | 1996-08-22 | 1997-08-22 | System for use in television roll-off band channels for data transfer over a network |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/735,110 | 1996-08-22 | ||
| US08/735,110 US5956346A (en) | 1996-10-22 | 1996-10-22 | Broadband communication system using TV channel roll-off spectrum |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| WO1998008345A2 WO1998008345A2 (en) | 1998-02-26 |
| WO1998008345A3 WO1998008345A3 (en) | 1998-07-09 |
| WO1998008345A9 WO1998008345A9 (en) | 1998-08-13 |
| WO1998008345B1 true WO1998008345B1 (en) | 1998-10-08 |
Family
ID=24954405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/014794 WO1998008345A2 (en) | 1996-08-22 | 1997-08-22 | System for use in television roll-off band channels for data transfer over a network |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5956346A (en) |
| AU (1) | AU4799497A (en) |
| WO (1) | WO1998008345A2 (en) |
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-
1996
- 1996-10-22 US US08/735,110 patent/US5956346A/en not_active Expired - Fee Related
-
1997
- 1997-08-22 AU AU47994/97A patent/AU4799497A/en not_active Abandoned
- 1997-08-22 WO PCT/US1997/014794 patent/WO1998008345A2/en active Application Filing
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