Hybrid/fiber coax video and telephony communication system with poly-phase filtering

• US 6,535,715 B2
• Filed: 09/15/1999
• Issued: 03/18/2003
• Est. Priority Date: 02/06/1995
• Status: Expired due to Term

• Current Assignee: HTC Corporation
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Dapper, Mark J., Geile, Michael J.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US09/396,308
• Publication Number:
  US 20020098796A1
• Time in Patent Office: 1,280 Days
• Field of Search: 455/5.1, 370/210, 370/484
• US Class Current: 455/3.05
• CPC Class Codes: G06F 17/14 Fourier, Walsh or analogous domain transformations , e.g. Laplace, Hilbert, Karhunen-Loeve, transforms for correlation function computation G06F17/156; spectrum analysers G01R23/16
• CPC Class Codes: G06F 17/142 Fast Fourier transforms, e.g. using a Cooley-Tukey type algorithm
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04B 10/272 Star-type networks or tree-type networks
• CPC Class Codes: H04H 20/69 Optical systems
• CPC Class Codes: H04H 20/77 using carrier waves
• CPC Class Codes: H04H 20/78 CATV [Community Antenna Television] systems
• CPC Class Codes: H04H 20/79 using downlink of the CATV systems, e.g. audio broadcast via CATV network
• CPC Class Codes: H04H 20/80 having frequencies in two or more frequency bands, e.g. medium wave and VHF
• CPC Class Codes: H04H 60/11 Arrangements for counter-measures when a portion of broadcast information is unavailable
• CPC Class Codes: H04H 60/86 accessed over CATV networks
• CPC Class Codes: H04H 60/96 CATV systems for accessing the Internet H04H60/86
• CPC Class Codes: H04H 60/97 using uplink of the CATV systems
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04K 3/226 Selection of non-jammed channel for communication spectrum sharing arrangements H04W16/14; selection of wireless resources by user or terminal H04W72/02
• CPC Class Codes: H04K 3/255 based on redundancy of transmitted data, transmission path or transmitting source
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0045 : Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 : Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0071 : Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/24 : Testing correct operation
• CPC Class Codes: H04L 12/10 : Current supply arrangements
• CPC Class Codes: H04L 12/12 : Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/2801 : Broadband local area networks
• CPC Class Codes: H04L 12/44 : Star or tree networks
• CPC Class Codes: H04L 2001/0093 : Point-to-multipoint
• CPC Class Codes: H04L 2027/0036 : using a recovered symbol clock
• CPC Class Codes: H04L 2027/0057 : quadrature phase
• CPC Class Codes: H04L 2027/0067 : Phase error detectors
• CPC Class Codes: H04L 25/03866 : using scrambling
• CPC Class Codes: H04L 27/2601 : Multicarrier modulation systems
• CPC Class Codes: H04L 27/2614 : Peak power aspects
• CPC Class Codes: H04L 27/2631 : with polyphase implementation
• CPC Class Codes: H04L 27/2634 : Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
• CPC Class Codes: H04L 27/2647 : Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2652 : with polyphase implementation
• CPC Class Codes: H04L 27/26524 : Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
• CPC Class Codes: H04L 27/2654 : Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
• CPC Class Codes: H04L 27/2655 : Synchronisation arrangements
• CPC Class Codes: H04L 27/2657 : Carrier synchronisation
• CPC Class Codes: H04L 27/2662 : Symbol synchronisation
• CPC Class Codes: H04L 27/34 : Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 41/0213 : Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 41/064 : involving time analysis
• CPC Class Codes: H04L 41/0896 : Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities flow or congestion control using dynamic resource allocation, e.g. in-call renegotiation, H04L47/76
• CPC Class Codes: H04L 43/00 : Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/022 : by sampling
• CPC Class Codes: H04L 43/067 : using time frame reporting
• CPC Class Codes: H04L 43/0811 : by checking connectivity
• CPC Class Codes: H04L 43/0817 : by checking functioning
• CPC Class Codes: H04L 43/0823 : Errors, e.g. transmission errors
• CPC Class Codes: H04L 43/0829 : Packet loss
• CPC Class Codes: H04L 43/0847 : Transmission error
• CPC Class Codes: H04L 43/0852 : Delays
• CPC Class Codes: H04L 43/0858 : One way delays
• CPC Class Codes: H04L 43/0864 : Round trip delays
• CPC Class Codes: H04L 43/0882 : Utilisation of link capacity
• CPC Class Codes: H04L 43/16 : Threshold monitoring
• CPC Class Codes: H04L 5/0007 : the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 : Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 : allocation of payload
• CPC Class Codes: H04L 5/023 : Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/14 : Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/143 : for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04L 5/1484 : operating bytewise
• CPC Class Codes: H04M 7/006 : Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 9/027 : Frequency division multiplex systems
• CPC Class Codes: H04N 21/2221 : being a cable television head-end CATV in broadcast systems H04H20/78
• 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 21/2385 : Channel allocation H04N21/266 takes precedence; Bandwidth allocation H04N21/24 takes precedence ; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16
• CPC Class Codes: H04N 21/2402 : Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• 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 21/6118 : involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 21/6137 : involving transmission via a telephone network, e.g. POTS
• CPC Class Codes: H04N 21/6168 : involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 7/17309 : Transmission or handling of upstream communications
• CPC Class Codes: H04N 7/22 : Adaptations for optical transmission
• CPC Class Codes: H04W 24/00 : Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/08 : Testing, supervising or monitoring using real traffic
• CPC Class Codes: Y02D 30/50 : in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A communication system is described. The communication system includes a distribution network between a head end terminal and at least one remote unit. The head end terminal receives upstream telephony and control data modulated on a plurality of orthogonal carriers in a frequency bandwidth over the distribution network. The head end terminal includes a polyphase filter that filters at least the upstream telephony data to provide ingress protection for the modulated orthogonal carriers. The communication further includes a service unit multicarrier modem associated with the at least one remote unit and operatively connected to the distribution network for modulating at least upstream telephony information on at least one carrier orthogonal at the head end terminal to at least one other carrier in the frequency bandwidth.

Claims

1. A communication system, comprising:

a distribution network between a head end terminal and at least one remote unit, the head end terminal for receipt of upstream telephony information and upstream control data in a frequency bandwidth over the distribution network;

at least one service unit multicarrier means, each associated with at least one remote unit and operatively connected to the distribution network for modulating at least upstream telephony information on at least one carrier orthogonal at the head end terminal to at least one other carrier in the frequency bandwidth;

service unit controller means operatively connected to the service unit multicarrier means for controlling the modulation performed by the service unit multicarrier means; and

wherein the head end terminal includes;

head end multicarrier means for demodulating at least upstream telephony information modulated on a plurality of orthogonal carriers in the frequency bandwidth, the head end multicarrier means including polyphase filter means for filtering the at least upstream telephony information modulated on the plurality of orthogonal carriers to provide ingress protection for the modulated orthogonal carriers; and

head end controller means operatively connected to the head end multicarrier means for controlling receipt of the upstream control data and upstream telephony information.

2. The system according to claim 1, wherein the plurality of orthogonal carriers in the frequency bandwidth include a plurality of telephony information channels for transmission of upstream telephony information after modulation of upstream telephony information thereon and at least one control channel associated with the plurality of telephony information channels for transmission of upstream control data after modulation of upstream control data thereon.

3. The system according to claim 1, wherein

the head end terminal further includes downstream multicarrier means for modulating at least downstream control information on a carrier in an additional frequency bandwidth over the distribution network,

the head end controller means is further operatively connected to the downstream multicarrier means for controlling transmission of the at least downstream control data and for generating a command for transmission by the head end terminal as downstream control information for the remote unit to utilize at least one different carrier for upstream transmission in the frequency bandwidth,

the at least one service unit multicarrier means is further operatively connected to the distribution network for demodulating the command transmitted as downstream control information modulated on the at least one carrier in the additional frequency bandwidth, and

the service unit controller means operatively connected to the service unit multicarrier means for controlling the demodulation performed by the service unit multicarrier means and for receiving the command and controlling the at least one service unit to transmit utilizing the different carrier as instructed by the head end controller.

4. A method of polyphase filtering in a communication system, comprising the steps of:

receiving a plurality of orthogonal carriers having modulated telephony information thereon, the plurality of orthogonal carriers including a first and second plurality of noncontiguous channel sets;

filtering the first plurality of noncontiguous channel sets and passing a first plurality of channels of each channel set of the first plurality of noncontiguous channel sets; and

filtering the second plurality of noncontiguous channel sets and passing a second plurality of channels;

wherein passing the second plurality of channels includes passing channels of each channel set of the second plurality of noncontiguous channel sets and passing channels not passed when passing the filtered channels of the first plurality of non- contiguous channel sets.

5. A communication system, comprising:

a distribution network between a head end terminal and at least one remote unit, the head end terminal receives upstream telephony and control data modulated on a plurality of orthogonal carriers in a frequency bandwidth over the distribution network, wherein the head end terminal includes a polyphase filter that filters at least the upstream telephony data to provide ingress protection for the modulated orthogonal carriers; and

a service unit multicarrier modem associated with the at least one remote unit and operatively connected to the distribution network for modulating at least upstream telephony information on at least one carrier orthogonal at the head end terminal to at least one other carrier in the frequency bandwidth.

6. The system of claim 5, wherein the plurality of orthogonal carriers in the frequency bandwidth include a plurality of telephony information channels for transmission of upstream telephony information after modulation of upstream telephony information thereon and at least one control channel associated with the plurality of telephony information channels for transmission of upstream control data after modulation of upstream control data thereon.

7. The system of claim 5, wherein the head end terminal further includes:

a head end multicarrier modem for modulating at least downstream control information on a carrier in an additional frequency bandwidth over the distribution network; and

a head end controller operatively connected to the head end multicarrier modem for controlling transmission of the at least downstream control data and for generating a command for transmission by the head end terminal as downstream control information for the remote unit to utilize at least one different carrier for upstream transmission in the frequency bandwidth.

8. The system of claim 7, wherein the service unit multicarrier modem is further operatively connected to the distribution network for demodulating the command transmitted as downstream control information modulated on the at least one carrier in the additional frequency bandwidth.

9. The system of claim 8, further comprising a service unit controller operatively connected to the service unit multicarrier modem for controlling the demodulation performed by the service unit multicarrier modem and for receiving the command and controlling the at least one remote unit to transmit utilizing the different carrier as instructed by the head end controller.

10. The system of claim 5, wherein the polyphase filter includes a first and second polyphase filter.

11. The communication system of claim 10, wherein the first polyphase filter filters a first plurality of channel sets and passes a first plurality of at least telephony channels within each channel set of the first plurality of channel sets and wherein the second polyphase filter filters a second plurality of channel sets and passes a second plurality of at least telephony channels within each channel set of the second plurality of channel sets, the first and second polyphase filter offset from one another such that all at least telephony channels of the first and second plurality of channels sets are passed.

12. The communication system of claim 5, wherein the polyphase filter includes at least two staggered polyphase filters.

13. A communication system, comprising:

a head end terminal;

at least one remote unit;

a distribution network, coupled between the head end terminal and the at least one remote unit;

the head end terminal including;

a head end multicarrier modem adapted to demodulate signals modulated on a plurality of orthogonal carriers in a first frequency bandwidth,

a head end controller operatively connected to the head end multicarrier modem for controlling receipt of signals; and

wherein the head end multicarrier modem includes a polyphase filter adapted to selectively filter the received signals to provide ingress protection for the modulated orthogonal carriers;

the at least one remote unit including;

a second multicarrier modem, operatively connected to the distribution network for modulating signals on at least one carrier orthogonal at the head end terminal to at least one other carrier in the frequency bandwidth; and

a second controller operatively connected to the second multicarrier modem for controlling the modulation performed by the second multicarrier modem.

14. The communication system of claim 13, wherein the polyphase filter includes a first and second polyphase filter.

15. The communication system of claim 14, wherein the first polyphase filter filters a first plurality of channel sets and passes a first plurality of at least telephony channels within each channel set of the first plurality of channel sets and wherein the second polyphase filter filters a second plurality of channel sets and passes a second plurality of at least telephony channels within each channel set of the second plurality of channel sets, the first and second polyphase filter offset from one another such that all at least telephony channels of the first and second plurality of channels sets are passed.

16. The communication system of claim 13, wherein the polyphase filter includes at least two overlapping polyphase filters.