60 GHz RF CATV repeater

• US 20040139477A1
• Filed: 01/15/2003
• Published: 07/15/2004
• Est. Priority Date: 01/15/2003
• Status: Abandoned Application

• Current Assignee: Terabeam Corporation (Proxim Wireless Corporation)
• Original Assignee: Terabeam Corporation (Proxim Wireless Corporation)
• Inventors: Russell, David B., Bir, Robert C., Rosa, Thomas
• Application Number:
  US10/346,012
• Publication Number:
  US 20040139477A1
• Time in Patent Office: Days
• US Class Current: 725/126
• CPC Class Codes: H04N 21/6112 involving terrestrial transmission, e.g. DVB-T
• CPC Class Codes: H04N 7/16 Analogue secrecy systems; Analogue subscription systems
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

A method and system for extending the reach of cable television (CATV) broadcast networks via 60 GHz (nominally) wireless radio frequency (RF) repeaters. An original CATV AML broadcast signal, having a bandwidth of 55-860 MHz, is up-converted to a millimeter wavelength RF signal having a nominal base frequency of 60 GHz (57-64 GHz) such that the up-converted signal has a bandwidth of the base frequency plus the bandwidth of the CATV broadcast signal (e.g., 60.055-60.860 GHz). This up-converted signal is then transmitted from a transmitter antenna to a receiver antenna, which collectively define the end points of a point-to-point wireless link between network nodes. The up-converted signal is then down converted at the receiver end to produce a repeated CATV AML broadcast signal having substantially the same characteristics as the original signal. The radio transmission operations may be performed in accordance with FCC part 15.255 transmissions, enabling unlicensed operation.

Claims

1. A wireless cable television (CATV) broadcast signal repeater, comprising:

an up-converter, to receive an original CATV amplitude modulated link (AML) broadcast signal having an original form and up convert the signal to a millimeter wavelength up-converted signal having a nominal base frequency of 60 gigahertz (GHz);

a transmitter, operatively coupled to the up-converter, to transmit the up-converted signal via free space;

a receiver antenna, to receive the transmitted up-converted signal from the transmitter; and

a down-converter, operatively coupled to the 60 GHz receiver antenna, to down convert the up-converted signal to produce a repeated CATV AML broadcast signal substantially matching the original CATV AML broadcast signal,

wherein the nominal 60 GHz base frequency corresponds to a frequency within the range of 57-64 GHz and the transmitter and receiver antennas operate at a corresponding frequency.

2. The wireless CATV broadcast signal repeater of claim 1, wherein the up-converter comprises:

an input connector, to couple the up-converter to a cable carrying the original CATV AML broadcast signal;

a local oscillator to generate a nominal 60 GHz phase-locked signal; and

a mixer having a first input coupled to the input connector to receive the CATV AML broadcast signal, a second input coupled to receive the nominal 60 GHz phase-locked signal from the local oscillator, and an output, said mixer producing an up-converted signal having a nominal base frequency of 60 GHz at the output.

3. The wireless CATV broadcast signal repeater of claim 1, wherein the down-converter comprises:

an up-converted signal input, coupled to receive the up-converter signal from the receiver antenna;

a local oscillator to generate a nominal 60 GHz phase-locked signal; and

a mixer having a first input coupled to the up-converted signal input connector to receive the up-converted signal, a second input coupled to receive the nominal 60 GHz phase-locked signal from the local oscillator, and an output, said mixer producing the repeated CATV AML broadcast signal at its output.

4. The wireless CATV broadcast signal repeater of claim 3, wherein the down-converter further includes an amplifier disposed between the up-converted signal input and the first input of the mixer.

5. The wireless CATV broadcast signal repeater of claim 1, wherein the repeated CATV AML broadcast signal has a bandwidth of 55-860 MHz.

6. The wireless CATV broadcast signal repeater of claim 1, wherein the transmitter antenna transmits the up-converted signal as a unidirectional radio signal having a directivity of 1°

or less at 3 dB.

7. The wireless CATV broadcast signal repeater of claim 1, wherein the transmitter antenna transmits the up-converted signal as a unidirectional radio signal having a directivity of 4°

or less at 3 dB.

8. The wireless CATV broadcast signal repeater of claim 1, wherein the up-converted signal is transmitted between the transmitter and receiver antennas in accordance with radio transmission operations defined by FCC part 15.255.

9. A cable television (CATV) network, comprising:

a head end, to transmit an original CATV amplitude modulated link (AML) broadcast signal having an original form; and

a wireless CATV broadcast signal repeater, comprising;

an up-converter including an input operatively linked to the head end via cable infrastructure, to receive the original CATV AML broadcast signal and up convert the signal to an millimeter wavelength up-converted signal having a nominal base frequency of 60 gigahertz (GHz);

a transmitter antenna, operatively coupled to the up-converter, to transmit the up-converted signal via free space;

a receiver antenna, to receive the transmitted up-converted signal from the transmitter antenna; and

a down-converter, operatively coupled to the receiver antenna, to down convert the up-converted signal to produce a repeated CATV AML broadcast signal substantially matching the original CATV AML broadcast signal at an output to which one of a CATV sub-network or customer premise equipment may be operatively coupled via cable infrastructure,

wherein the nominal 60 GHz base frequency corresponds to a frequency within the range of 57-64 GHz and the transmitter and receiver antennas operate at a corresponding frequency.

10. The CATV network of claim 9, wherein the CATV AML broadcast signal has a bandwidth of 55-860 MHz.

11. The CATV network of claim 9, wherein the up-converted signal is transmitted between the transmitter and receiver antennas in accordance with radio transmission operations defined by FCC part 15.255.

12. The CATV network of claim 9, wherein the cable infrastructure includes a hub linked to the head end via a network trunk, said hub coupled to the input of the up converter.

13. The CATV network of claim 9, wherein the network includes a plurality of wireless CATV broadcast signal repeaters.

14. A method for extending the reach of a cable television (CATV) network, comprising:

providing an original CATV amplitude modulated link (AML) broadcast signal to a first network node;

transmitting the CATV AML broadcast signal from the first network node to a second network node via a wireless link by performing operations including,

up converting the original CATV AML broadcast signal to a millimeter wavelength up-converted signal having base frequency of 57-64 GHz,

transmitting the up-converted signal between a transmitter antenna operatively coupled to the first network node and a receiver antenna operatively coupled to the second network node;

down-converting the up-converted signal to produce a repeated CATV AML broadcast signal having waveform characteristics substantially similar to the original CATV AML broadcast signal; and

outputting the repeated CATV AML broadcast signal to the second network node.

15. The method of claim 14, wherein the CATV AML broadcast signal has a bandwidth of 55-860 MHz.

16. The method of claim 14, wherein the up-converted signal is transmitted between the transmitter and receiver antennas in accordance with radio transmission operations defined by FCC part 15.255.

17. The method of claim 14, wherein the transmitter antenna transmits the up-converted signal as a unidirectional radio signal having a directivity of 1°

or less at 3 dB.

18. The method of claim 14, wherein the 60 GHz transmitter antenna transmits the up-converted signal as a unidirectional radio signal having a directivity of 1°

or less at 3 dB.

19. The method of claim 14, wherein original CATV AML broadcast signal is up-converted by mixing the original CATV AML broadcast signal with a local oscillator phase locked signal having a frequency corresponding to the up-converted signal base frequency.

20. The method of claim 14, wherein the up-converted signal is down converted by mixing the up-converted signal with a local oscillator phase locked signal having a frequency corresponding to the up-converted signal base frequency.