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

  • US 20060212910A1
  • Filed: 12/09/2005
  • Published: 09/21/2006
  • Est. Priority Date: 04/16/2004
  • Status: Active Grant
First Claim
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1. An apparatus for wirelessly receiving a broadcast signal, processing the signal, and providing the processed signal to a television or display device at a dwelling, wherein the broadcast signal carries data component together with a video signal component, the apparatus comprising:

  • at least one antenna subsystem placed anywhere in or about the dwelling, and configured to;

    receive the signal;

    perform a set of preprocesses on the signal; 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;

    at least one receiver subsystem collocated with the television or the display device, and configured to;

    receive the coded and modulated preprocessed signal;

    demodulate the received signal using a remote demodulator, wherein the remote demodulator recovers the signal;

    wherein the remote communication link is configured for sending the encoded and modulated preprocessed data from the at least one antenna subsystem to the at least one receiver subsystem in accordance with techniques suitable for indoor transmission and reception;

    a return channel for providing command and control data from the at least one receiver subsystem to the at least one antenna subsystem; and

    wherein the at least one antenna subsystem and the at least one receiver subsystem together form a unit that includes;

    a tuner and an RF AGC (Automatic Gain Control) module for tuning to a broadcast channel, and performing level setting with respect to the broadcast signal;

    an RF/IF/ADC (radio-frequency/intermediate-frequency/analog-to-digital converter) for digitizing the broadcast signal;

    a DDC (direct digital downconvert) module for mixing the digitized signal from the RF/IF/ADC module to near baseband;

    an RD4 (rate decimation by

         4) filter for decimating the digitized signal;

    a QSCR (quasi-synchronous carrier recovery) module for translating the digitized signal to baseband so that a video carrier is aligned with a zero degree phasor and a data subcarrier is aligned with a 90-degree phasor, and for estimating frequency offset, and for providing a control signal to the controller;

    a Nyquist and CVSB (complementary vestigial sideband) filter for performing linear filtering to isolate the video and data components;

    a video-sync module for synchronization and framing to the television signal and providing control signals based on the television signal, wherein the video-sync module provides control signals, based on the analog television signal, to the controller and an FF-AGC (feed-forward-automatic-gain-control) module;

    an SB-Mix (sub-band mix) module for adjusting a frequency 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 subcarier, and for adjusting a gain of the video and data components;

    a slicer;

    an equalizer coupled to the slicer;

    an output framer configured for extracting command and control information, and for framing an output from the equalizer wherein both the equalizer and the slicer are coupled to an output framer;

    an FEC (forward error correction) module for receiving framed data from the output framer, and applying error correcting codes to substantially reduce errors; and

    wherein the unit may be partitioned to form the antenna subsystem and the receiver subsystem between the tuner, the RF/IF/ADC, the DDC module, the RD4 filter, the QSCR module, the Nyquist and CVSB filter, the SB-Mix module, the equalizer, the slicer, the FEC module, or after the FEC module.

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