Methods, apparatus and systems for terrestrial wireless broadcast of digital data to stationary receivers
First Claim
1. A method for terrestrial broadcast of digital data to stationary receivers, comprising:
- encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream; and
communicating said data stream to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%.
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Accused Products
Abstract
The present invention provides methods, apparatus and systems for delivery of digital data to stationary receivers over a terrestrial wireless link at a low data rate using a new coded orthogonal frequency division multiplexing (COFDM) scheme. Digital data is encoded and modulated using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream. The data stream is communicated to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%. The COFDM scheme employed by the present invention overcomes the degradation of multipath fading induced by terrestrial channels, such as the Ultra High Frequency (UHF) broadcast channel.
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Citations
28 Claims
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1. A method for terrestrial broadcast of digital data to stationary receivers, comprising:
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encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream; and
communicating said data stream to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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3. A method in accordance with clam 1, wherein:
said data stream has a data rate of no more than about 1 Mbps.
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24. Apparatus for terrestrial broadcast of digital data to stationary receivers, comprising:
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an encoder/modulator for encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream; and
a transmitter for communicating said data stream to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%.
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25. A system for terrestrial broadcast of digital data to stationary receivers, comprising:
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an encoder/modulator for encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM) to produce a data stream;
a transmitter for transmitting said data stream;
a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%; and
a stationary receiver for receiving said data stream from said transmitter via said terrestrial wireless link.
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26. A stationary receiver for receiving a data stream via a terrestrial wireless link, said receiver comprising:
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a tuner for receiving a data stream via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%, said data stream produced by encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM);
a demodulator for demodulating said data stream to produce a demodulated data stream; and
a decoder for decoding said demodulated data stream to recover said digital data.
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27. A method for receiving a data stream via a terrestrial wireless link, said method comprising:
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receiving a data stream via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%, said data stream produced by encoding and modulating digital data using coded orthogonal frequency division multiplexing (COFDM);
demodulatng said data stream to produce a demodulated data stream;
decoding said demodulated data stream to recover said digital data.
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28. A data stream for carrying digital data via a terrestrial wireless link, said data stream comprising:
digital data that is encoded and modulated using coded orthogonal frequency division multiplexing (COFDM) to produce said data stream which is adapted for communication to a stationary receiver via a terrestrial wireless link having a ratio of (i) 50% coherence bandwidth to (ii) allocated channel bandwidth of not greater than 50%.
Specification