Remote antenna and local receiver subsystems for receiving data signals carried over analog television

• US 7,853,978 B2
• Filed: 12/09/2005
• Issued: 12/14/2010
• Est. Priority Date: 04/16/2004
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: Omereen Wireless LLC (Intellectual Ventures LLC)
• Inventors: Hoarty, W. Leo, Simovich, Slobodan, Chung, Wonzoo, Endres, Thomas J.
• Primary Examiner(s): Hirl; Joseph P
• Assistant Examiner(s): RABOVIANSKI, JIVKA A
• Application Number:
  US11/299,318
• Publication Number:
  US 20060212910A1
• Time in Patent Office: 1,831 Days
• Field of Search: 725/74, 725/85, 725/135
• US Class Current: 725/74
• CPC Class Codes: H04H 20/63 to plural spots in a confined site, e.g. MATV [Master Antenna Television]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatus for remote antenna subsystems that are physically isolated from receiver subsystems are disclosed. The communication between the two subsystems uses remote communication links. The remote communication links are either wireless, in which case they are designed for indoor low power communications, or are wired, using existing infrastructure in the household such as the power lines. Partitioning between the antenna and receiver subsystems is selectable.

Claims

1. An apparatus for wirelessly receiving a terrestrial television broadcast signal carrying a data component together with a video component, processing the signal, and providing the processed signal to a display device at a dwelling, the apparatus comprising:

an antenna subsystem configured to be placed in or about the dwelling, and configured to;

receive the terrestrial television broadcast signal carrying the data component together with the video component from a transmitter station configured to wirelessly transmit the terrestrial television broadcast signal carrying the data component together with the video component to multiple antenna subsystems placed in or about one or more dwellings,

perform a set of preprocesses on the terrestrial television broadcast signal carrying the data component together with the video component, and

transmit the preprocessed signal to a receiver subsystem, over a remote communication link, via a remote modem that encodes and modulates the preprocessed signal

wherein the antenna subsystem is located remote from the transmitter station and remote from the receiver subsystem; and

a receiver subsystem configured to be collocated with the display device, and configured to;

receive the encoded and modulated preprocessed signal from the antenna subsystem, and

demodulate the received encoded and modulated preprocessed signal using a remote demodulator, wherein the remote demodulator is configured to recover the signal

wherein the receiver subsystem is located remote from the transmitter station and remote from the antenna subsystem,

wherein the antenna subsystem and the receiver subsystem can be configured to use a return channel to provide command and control data from the receiver subsystem to the antenna subsystem, and

wherein the antenna subsystem and the receiver subsystem together includes a plurality of components in accordance with a selected partition, wherein the plurality of components includes a tuner module configured to tune to a broadcast channel of the terrestrial television broadcast signal wirelessly transmitted from the transmitter station and carrying the data component together with the video component, an RF/IF/ADC (radio-frequency/intermediate-frequency/analog-to-digital converter) configured to digitize a signal, a downconvert module coupled to the RF/IF/ADC and configured to mix the digitized signal from the RF/IF/ADC to near baseband, a decimating filter coupled to the downconvert module and configured to reduce a sampling rate of the digitized signal, a recovery module coupled to the decimating filter and configured to translate the digitized signal to baseband and to provide a control signal to a controller, and a linear filter coupled to the recovery module and configured to isolate the video and data components of the digitized signal.

2. The apparatus of claim 1, wherein the selected partition separates the antenna subsystem and the receiver subsystem so that the antenna subsystem includes the tuner module and the receiver subsystem includes the RF/IF/ADC.

3. The apparatus of claim 1, wherein the plurality of components further includes:

a video-sync module configured to synchronize and frame a signal received from the linear filter to an analog television signal and to provide control signals based on the analog television signal, wherein the video-sync module is configured to provide the control signals to the controller and to an FF-AGC (feed-forward-automatic-gain-control) module;

an SB-Mix (sub-band mix) module configured to adjust a frequency of the signal received from the linear filter by a data sub-carrier frequency to translate the video and data components to complex baseband with respect to a frequency spectrum of the data sub-carrier, and to adjust a gain of the video and data components;

an SRRC filter coupled to the SB-Mix module and configured to further decimate the sampling rate of a signal received from the SB-Mix Module;

a slicer;

an equalizer coupled to the slicer;

an output framer configured to frame an output from the equalizer wherein both the equalizer and the slicer are coupled to the output framer; and

an FEC (forward error correction) module configured to receive framed data from the output framer and to apply error correcting codes to the framed data.

4. The apparatus of claim 3, further comprising an FF-AGC (feedback automatic gain control) module configured to use the control signals from the video-sync module to adjust a gain that is applied to the video and data signals in the SB-Mix module.

5. The apparatus of claim 3, wherein the SB-Mix (sub-band mix) adjusting of the gain of the video and data components is according to a control signal derived in a FF-AGC (feedback automatic gain control) module.

6. The apparatus of claim 3, wherein the SRRC filter is configured to apply a matched filter to the video and data signals or to apply a matched filter to the video and data signals and further decimate the sampling rate.

7. The apparatus of claim 3, wherein the equalizer is configured to perform adaptive data equalization and video cancellation.

8. The apparatus of claim 3, further comprising an FB-AGC (feedback automatic gain control) module coupled to the equalizer and configured to provide gain adjustment based on a decision-directed measure, wherein the FB-AGC module is configured to use an input from the slicer to derive a decision-directed measure.

9. The apparatus of claim 3, further comprising a DDCL (decision-directed carrier loop) module coupled to the equalizer configured to provide phase/frequency adjustments based on the decision-directed measure and wherein an input to DDCL module from the slicer is configured to derive the decision-directed measure.

10. The apparatus of claim 3 wherein the slicer is a nearest-element decision device.

11. The apparatus of claim 3, wherein the FEC module is configured to apply a concatenated reed-solomon block code with a trellis code.

12. The apparatus of claim 3 wherein the selected partition is selected from predefined partitions available between the antenna subsystem and the receiver subsystem.

13. The apparatus of claim 12 wherein a predefined partition partitions the apparatus between the tuner and the RF/IF/ADC.

14. The apparatus of claim 12 wherein a predefined partition partitions the apparatus between the linear filter and the SB-Mix module.

15. The apparatus of claim 12 wherein a predefined partition partitions the apparatus between the SRRC filter and the equalizer.

16. The apparatus of claim 12 wherein a predefined partition partitions the apparatus between the output framer and the FEC module.

17. The apparatus of claim 12 wherein a predefined partition partitions the apparatus after the FEC module.

18. The apparatus of claim 1, wherein the tuner module is further configured to perform frequency translation and filtering.

19. The apparatus of claim 1, wherein the RF/IF/ADC is further configured to perform level setting, frequency translation, and filtering, wherein a sampling clock of the RF/IF/ADC is adjusted by clock signals generated in a controller.

20. The apparatus of claim 1, wherein the decimating filter is configured to reduce the sampling rate without corrupting integrity of the video and data signals.

21. The apparatus of claim 1, further comprising at least one controller configured to use the control signals from the video-sync block and the recovery module to adjust the sampling clocks of the RF/IF/ADC and the downconvert modules, respectively.

22. The apparatus of claim 1, wherein the command and control information is provided to a controller configured to provide control signals to an output framer to instruct for proper framing of the data or of formatting which may be regionally-specific.

23. The apparatus of claim 1, wherein the antenna subsystem further comprises a conventional television antenna or an active antenna.

24. The apparatus of claim 1, wherein the return channel is further configured to communicate signal quality to the antenna subsystem during an installation procedure, and a graphical user interface is configured to display a measure of signal quality on the antenna subsystem, the receiver subsystem, or both.

25. The apparatus of claim 1, wherein another stage of down-conversion, level setting, and IF (intermediate frequency) filtering is implemented.

39. The apparatus of claim 1 wherein the transmitter station is not directly connected to the antenna subsystem or any other device directly connected to the antenna subsystem, wherein the transmitter station is not directly connected to the receiver subsystem or any other device directly connected to the receiver subsystem, and wherein the antenna subsystem is not directly connected to the receiver subsystem or any other device directly connected to the receiver subsystem.

40. The apparatus of claim 1, wherein IF output samples from the tuner module are directly supplied with no intermediate down-conversion.

26. In a television signal broadcasting and receiving arrangement where a transmitter wirelessly broadcasts a composite signal having ancillary data and a television signal, to electronic equipment in a structure, an apparatus for wirelessly receiving the composite signal, processing the composite signal, and providing the processed composite signal to the electronic equipment at the structure, the apparatus comprising:

an antenna subsystem configured to be spaced apart from the transmitter and placed in or about the structure, and configured to receive the composite signal having ancillary data and a television signal from the transmitter, configured to perform a set of preprocesses on the composite signal having ancillary data and a television signal, and configured to transmit the preprocessed composite signal to a receiver subsystem located near the electronic equipment; and

the receiver subsystem, configured to be spaced apart from the antenna subsystem and the transmitter, configured to receive the preprocessed composite signal from the antenna subsystem, configured to perform further processes on the composite signal, configured to provide the further processed composite signal to the electronic equipment at the structure, and configured to transmit control signals to the antenna subsystem

wherein the antenna subsystem and the receiver subsystem compose a configuration capable of performing a set of preprocesses and further processes on the composite signal, wherein the configuration comprises a tuner module configured to tune to a broadcast channel of the television signal of the composite signal wirelessly broadcast from the transmitter, an RF/IF/ADC (radio-frequency/intermediate-frequency/analog-to-digital converter) configured to digitize a signal corresponding to the tuned to broadcast channel of the composite signal broadcast from the transmitter, a downconvert module coupled to the RF/IF/ADC and configured to mix the digitized signal from the RF/IF/ADC to near baseband, and a decimating filter coupled to the downconvert module and configured to reduce a sampling rate of the digitized signal

wherein the configuration is selectively partitioned between the antenna subsystem and the receiver subsystem, and

wherein the receiver subsystem and the antenna subsystem are capable of two-way communication with each other wirelessly and/or through wired transmission mediums within the structure.

27. The apparatus of claim 26, wherein television signals which carry standard analog video are transmitted together with a data-bearing sub-carrier that is placed in quadrature to a visual carrier, and wherein multiple sub-carriers are used, spread spectrum methods are used for data insertion, and OFDM (orthogonal frequency division multiplexing) methods are used for data insertion, or any combination thereof.

28. The apparatus of claim 26, wherein the antenna subsystem uses solar-power, rechargeable or disposable batteries, wind power, alternating current (AC) power, or low-voltage direct current (DC) power.

29. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

a wireless, frequency-hopped, spread spectrum communication system configured to modulate carrier tones based on a keying of a pseudo-random sequence.

30. The apparatus of claim 26 wherein the ancillary data includes digital information, and wherein the digital information is inserted by negative AM of an FM aural carrier in the television signal, and wherein the antenna subsystem or the receiver subsystem is configured to recover the digital information from the FM aural carrier.

31. The apparatus of claim 26 wherein the structure is an automobile.

32. The apparatus of claim 26 wherein an entire set-top-box is placed in the antenna subsystem.

33. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

a wireless COFDM (coded orthogonal frequency division multiplexing) communication system.

34. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

a wireless communication system combining COFDM and DS-SS (direct sequence spread spectrum), wherein each sub-carrier in the COFDM system is spread by a spreading sequence prior to IDFT (inverse discrete Fourier transform) filtering, and de-spread after DFT (discrete Fourier transform) filtering.

35. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

a wireless, single-carrier QAM (quadrature amplitude modulation) communication system with trellis and reed-solomon error correcting codes or a communication system with turbo codes.

36. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

an existing Ethernet link, shared with other communication networks in the structure.

37. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

an existing power distribution network in the structure.

38. The apparatus of claim 26, wherein the two-way communication comprises command-and-control signals and signals indicating reception quality measurements, and wherein two-way communication between the antenna subsystem and the receiver subsystem, comprises at least:

an existing IEEE 802.11a or IEEE 802.11g system in the structure.

41. The apparatus of claim 26 wherein the configuration is selectively partitioned by selecting from predefined partitions available between the antenna subsystem and the receiver subsystem.

42. The apparatus of claim 41 wherein a predefined partition partitions the apparatus between the tuner and the RF/IF/ADC.

43. The apparatus of claim 41, wherein the configuration further comprises:

a linear filter configured to isolate the video and data components of the digitized signal;

a video-sync module configured to synchronize and frame a signal received from the linear filter to an analog television signal and to provide control signals based on the analog television signal, wherein the video-sync module is configured to provide the control signals to the controller and to an FF-AGC (feed-forward-automatic-gain-control) module;

an SB-Mix (sub-band mix) module configured to adjust a frequency of the signal received from the linear filter by a data sub-carrier frequency to translate the video and data components to complex baseband with respect to a frequency spectrum of the data sub-carrier, and to adjust a gain of the video and data components;

an SRRC filter coupled to the SB-Mix module and configured to further decimate the sampling rate of a signal received from the SB-Mix Module;

a slicer;

an equalizer coupled to the slicer;

an output framer configured to frame an output from the equalizer wherein both the equalizer and the slicer are coupled to the output framer; and

an FEC (forward error correction) module configured to receive framed data from the output framer and to apply error correcting codes to the framed data.

44. The apparatus of claim 43 wherein a predefined partition partitions the apparatus between the linear filter and the SB-Mix module.

45. The apparatus of claim 43 wherein a predefined partition partitions the apparatus between the SRRC filter and the equalizer.

46. The apparatus of claim 43 wherein a predefined partition partitions the apparatus between the output framer and the FEC module.

47. The apparatus of claim 43 wherein a predefined partition partitions the apparatus after the FEC module.