Cable communication systems and methods employing 256-QAM upstream channels and having increased upstream capacity for supporting voice and/or data services
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-007/173
G01R-031/08
G06F-011/00
G08C-015/00
H04J-001/16
H04J-003/14
H04L-001/00
H04L-012/26
출원번호
US-0669172
(2012-11-05)
등록번호
US-8650606
(2014-02-11)
발명자
/ 주소
Nielsen, Steven
Totten, Ronald
Halky, Travis
출원인 / 주소
CertusView Technologies, LLC
인용정보
피인용 횟수 :
4인용 특허 :
28
초록▼
Cable communication systems and methods to provide voice and/or data services to subscriber premises via a cable plant that conveys upstream information over an upstream path bandwidth, and a cable modem system including one or more demodulation tuners to receive and demodulate one or more upstream
Cable communication systems and methods to provide voice and/or data services to subscriber premises via a cable plant that conveys upstream information over an upstream path bandwidth, and a cable modem system including one or more demodulation tuners to receive and demodulate one or more upstream radio frequency (RF) signals. An RF signal includes an encoded carrier wave having a carrier frequency of between approximately 5 MHz and at least approximately 42 MHz that is modulated using quadrature amplitude modulation (QAM) with voice and/or data information constituting at least some of the upstream information. A modulation order of the QAM for the first upstream RF signal is at least 256, and at least one demodulation tuner of the cable modem system is configured to receive and demodulate the first upstream RF signal.
대표청구항▼
1. A cable communication system to provide voice and/or data services to a plurality of subscriber premises, the system comprising: an ingress-mitigated cable plant to convey at least upstream information from the plurality of subscriber premises over an upstream path bandwidth including a range of
1. A cable communication system to provide voice and/or data services to a plurality of subscriber premises, the system comprising: an ingress-mitigated cable plant to convey at least upstream information from the plurality of subscriber premises over an upstream path bandwidth including a range of frequencies; and a cable modem system coupled to the cable plant and including at least one demodulation tuner to receive and demodulate at least one upstream radio frequency (RF) signal, wherein the at least one upstream RF signal includes at least one encoded carrier wave having a carrier frequency in the upstream path bandwidth and being modulated, using quadrature amplitude modulation (QAM), with voice and/or data information constituting at least some of the upstream information from at least some of the plurality of subscriber premises,wherein:the at least one upstream RF signal includes a first upstream RF signal having a first carrier frequency of between approximately 5 MHz and 25 MHz;a modulation order of the QAM for the first upstream RF signal is at least 256;the at least one demodulation tuner includes a first demodulation tuner configured to receive and demodulate the first upstream RF signalthe first upstream RF signal defines a first upstream physical communication channel in the upstream path bandwidth;a carrier-to-interference-noise ratio (CNIR) of the first upstream physical communication channel is at least 34 decibels (dB);an unequalized modulation error ratio (MER) of the first upstream physical communication channel is at least 28 decibels (dB);the at least one upstream RF signal further includes at least a second upstream RF signal having a second carrier frequency of between approximately 5 MHz and at least approximately 42 MHz;a modulation order of the QAM for the second upstream RF signal is at least 256; andthe at least one demodulation tuner includes a second demodulation tuner configured to receive and demodulate the second upstream RF signal. 2. The system of claim 1, wherein: the at least one upstream RF signal further includes at least a third upstream RF signal and a fourth upstream RF signal;a modulation order of the QAM for the third upstream RF signal and the fourth upstream RF signal is at least 256; andrespective carrier frequencies for the third upstream RF signal and the fourth upstream RF signal are between approximately 5 MHz and at least approximately 42 MHz. 3. The system of claim 1, wherein: each subscriber premise of the plurality of subscriber premises requires only one of the first upstream RF signal and the second upstream RF signal to transmit subscriber voice and/or data information from the subscriber premise. 4. The system of claim 3, wherein: the first upstream RF signal is encoded with at least some of the voice and/or data information using a Time Division Multiple Access (TDMA) protocol or an Advanced Time Division Multiple Access (ATDMA) protocol; andthe first demodulation tuner is configured to receive and demodulate the first upstream RF signal using the TDMA protocol or the ATDMA protocol. 5. The system of claim 3, wherein: the first upstream RF signal is encoded with at least some of the voice and/or data information using a Synchronous Code Division Multiple Access (S-CDMA) protocol; andthe first demodulation tuner is configured to receive and demodulate the first upstream RF signal using the S-CDMA protocol. 6. The system of claim 1, wherein: the first upstream physical communication channel has a first upstream average channel power; anda highest value for an average noise power in the upstream path bandwidth between 5 MHz and 19.6 MHz, as measured over at least a 24 hour period at the cable modem system, is at least 34 decibels (dB) below the first upstream average channel power. 7. The system of claim 6, wherein the highest value for the average noise power in the upstream path bandwidth between 5 MHz and 19.6 MHz, as measured over at least the 24 hour period at the cable modem system, is at least 36 decibels (dB) below the first upstream average channel power. 8. The system of claim 6, wherein the highest value for the average noise power in the upstream path bandwidth between 5 MHz and 19.6 MHz, as measured over at least the 24 hour period at the cable modem system, is at least 38 decibels (dB) below the first upstream average channel power. 9. The system of claim 1, wherein: the first upstream physical communication channel has a first channel bandwidth of approximately 6.4 MHz. 10. The system of claim 1, wherein the carrier-to-interference-noise ratio (CNIR) of the first upstream physical communication channel is at least 37 dB. 11. The system of claim 1, wherein the unequalized MER of the first upstream physical communication channel is at least 30 dB. 12. The system of claim 1, wherein: the ingress-mitigated cable plant includes a plurality of neighborhood nodes, a first neighborhood node of the plurality of neighborhood nodes conveying first upstream information, via the first upstream RF signal, from a first portion of the plurality of subscriber premises over the upstream path bandwidth assigned to the first neighborhood node;the first demodulation tuner of the cable modem system is coupled to the first neighborhood node to receive and decode the first upstream RF signal; anda highest value for an average noise power in the upstream path bandwidth assigned to the first neighborhood node, as measured over at least a 24 hour period at the cable modem system, is less than or equal to 10 decibels (dB) above a noise floor associated with the upstream path bandwidth assigned to the first neighborhood node, as measured over at least the 24 hour period at the cable modem system. 13. The system of claim 12, wherein a first portion of the cable plant in the first neighborhood node passes at least 200 premises. 14. The system of claim 13, wherein the first portion of the plurality of subscriber premises in the first neighborhood node includes at least 75 subscriber premises. 15. The system of claim 12, wherein a first portion of the cable plant in the first neighborhood node includes at least 20 amplifiers. 16. The system of claim 12, wherein a node mileage for a first portion of the cable plant in the first neighborhood node is at least three miles. 17. The system of claim 12, wherein a cascade for the first portion of the cable plant in the first neighborhood node is at least five (NODE+5). 18. The system of claim 12, wherein a cascade for the first portion of the cable plant in the first neighborhood node is at least six (NODE+6). 19. The system of claim 12, wherein a cascade for the first portion of the cable plant in the first neighborhood node is at least eight (NODE+8). 20. The system of claim 12, wherein: the first upstream physical communication channel has a first channel bandwidth;the first neighborhood node includes at least a first service group including a first number of subscriber premises of the first portion of the plurality of subscriber premises;the first upstream physical communication channel carries first voice and/or data information from the first service group; andthe first number of subscriber premises included in the first service group is at least 75. 21. The system of claim 12, wherein: the first upstream physical communication channel carries first voice and/or data information from a first portion of the plurality of subscriber premises;the first upstream physical communication channel has a first deployed capacity (Mbits/s); andthe first voice and/or data information constitutes a first channel utilization index of at least 50% of the first deployed capacity of the first upstream physical communication channel over a predetermined time period. 22. In a cable communication system to provide voice and/or data services to a plurality of subscriber premises, the system comprising: an ingress-mitigated cable plant to convey at least upstream information from the plurality of subscriber premises over an upstream path bandwidth including a range of frequencies; anda cable modem system coupled to the cable plant and including at least one demodulation tuner to receive and demodulate at least one upstream radio frequency (RF) signal, wherein the at least one upstream RF signal includes at least one encoded carrier wave having a carrier frequency in the upstream path bandwidth and being modulated, using quadrature amplitude modulation (QAM), with voice and/or data information constituting at least some of the upstream information from at least some of the plurality of subscriber premises,a method of transmitting the at least some of the upstream information from the plurality of subscriber premise to the cable modem system, the method comprising:transmitting from at least one of the plurality of subscriber premises a first upstream RF signal having a first carrier frequency of between approximately 5 MHz and 25 MHz,wherein:a modulation order of the QAM for the first upstream RF signal is at least 256;the at least one demodulation tuner includes a first demodulation tuner configured to receive and demodulate the first upstream RF signalthe first upstream RF signal defines a first upstream physical communication channel in the upstream path bandwidth;a carrier-to-interference-noise ratio (CNIR) of the first upstream physical communication channel is at least 34 decibels (dB);an unequalized modulation error ratio (MER) of the first upstream physical communication channel is at least 28 decibels (dB);the at least one upstream RF signal further includes at least a second upstream RF signal having a second carrier frequency of between approximately 5 MHz and at least approximately 42 MHz;a modulation order of the QAM for the second upstream RF signal is at least 256; andthe at least one demodulation tuner includes a second demodulation tuner configured to receive and demodulate the second upstream RF signal. 23. The method of claim 22, wherein: the first upstream RF signal is encoded with at least some of the voice and/or data information using a Time Division Multiple Access (TDMA) protocol or an Advanced Time Division Multiple Access (ATDMA) protocol; andthe first demodulation tuner is configured to receive and demodulate the first upstream RF signal using the TDMA protocol or the ATDMA protocol. 24. The method of claim 22, wherein: the first upstream physical communication channel has a first upstream average channel power; anda highest value for an average noise power in the upstream path bandwidth between 5 MHz and 19.6 MHz, as measured over at least a 24 hour period at the cable modem system, is at least 34 decibels (dB) below the first upstream average channel power. 25. A cable communication system to provide voice and/or data services to a plurality of subscriber premises, the system comprising: at least a first neighborhood node having an infrastructure comprising: a first fiber optic cable;a first node optical/RF converter coupled to the first fiber optic cable; anda ingress-mitigated cable plant, coupled to the first node optical/RF converter, to convey at least upstream information from the plurality of subscriber premises over an upstream path bandwidth assigned to the first neighborhood node, wherein: the cable plant in the first neighborhood node passes at least 200 premises;the plurality of subscriber premises in the first neighborhood node includes at least 75 subscriber premises;the cable plant includes at least 20 amplifiers;a node mileage of the first neighborhood node is at least three miles; anda cascade for the cable plant in the first neighborhood node is at least five (NODE+5); anda headend or hub comprising: a headend optical/radio frequency (RF) converter coupled to the first fiber optic cable of the first neighborhood node;a cable modem system coupled to the headend optical/RF converter and including a plurality of demodulation tuners to receive and demodulate a plurality of upstream radio frequency (RF) signals from the first neighborhood node, each upstream RF signal of the plurality of upstream RF signals including at least one encoded carrier wave having at least one carrier frequency in the upstream path bandwidth of the first neighborhood node and being modulated, using quadrature amplitude modulation (QAM), with voice and/or data information constituting at least some of the upstream information from at least some of the plurality of subscriber premises,wherein:the plurality of upstream RF signals includes a first upstream RF signal having a first carrier frequency of between approximately 5 MHz and at least approximately 25 MHz;a modulation order of the QAM for the first upstream RF signal is at least 256;the plurality of demodulation tuners includes at least a first demodulation tuner configured to receive and demodulate the first upstream RF signal;the at least one upstream RF signal further includes at least a second upstream RF signal having a second carrier frequency of between approximately 5 MHz and at least approximately 42 MHz;a modulation order of the QAM for the second upstream RF signal is at least 256; andthe at least one demodulation tuner includes a second demodulation tuner configured to receive and demodulate the second upstream RF signal. 26. The system of claim 25, wherein: the first upstream RF signal defines a first upstream physical communication channel in the upstream path bandwidth; andthe first upstream physical communication channel has a first channel bandwidth of approximately 6.4 MHz. 27. A cable communication system to provide voice and/or data services to a plurality of subscriber premises, the system comprising: at least a first neighborhood node including a cable plant to convey at least upstream information from the plurality of subscriber premises in the first neighborhood node over an upstream path bandwidth assigned to the first neighborhood node;a cable modem system coupled to the cable plant in the first neighborhood node and including at least one demodulation tuner to receive and demodulate at least one upstream radio frequency (RF) signal, wherein the at least one upstream RF signal includes at least one encoded carrier wave having a carrier frequency in the upstream path bandwidth assigned to the first neighborhood node and being modulated, using quadrature amplitude modulation (QAM), with voice and/or data information constituting at least some of the upstream information from at least some of the plurality of subscriber premises in the first neighborhood node,wherein:the at least one upstream RF signal includes a first upstream RF signal having a first carrier frequency of between approximately 5 MHz and approximately 25 MHz;a modulation order of the QAM for the first upstream RF signal is at least 256;the at least one demodulation tuner includes a first demodulation tuner configured to receive and demodulate the first upstream RF signal;the at least one upstream RF signal further includes at least a second upstream RF signal having a second carrier frequency of between approximately 5 MHz and at least approximately 42 MHz;a modulation order of the QAM for the second upstream RF signal is at least 256; andthe at least one demodulation tuner includes a second demodulation tuner configured to receive and demodulate the second upstream RF signal;the first upstream RF signal defines a first upstream physical communication channel in the upstream path bandwidth, the first upstream physical communication channel having a first upstream average channel power; anda highest value for an average noise power in the upstream path bandwidth, as measured from 5 MHz to 42 MHz over at least a 24 hour period at the cable modem system, is at least 34 decibels (dB) below the first upstream average channel power. 28. The system of claim 27, wherein a cascade for the cable plant in the first neighborhood node is at least four (NODE+4). 29. The system of claim 27, wherein: the first upstream physical communication channel has a first channel bandwidth of approximately 6.4 MHz. 30. The system of claim 27, wherein: each subscriber premise of the plurality of subscriber premises in the first neighborhood node requires only one of the first upstream RF signal and the second upstream RF signal to transmit subscriber voice and/or data information from the subscriber premise.
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