High availability narrowband channel for bandwidth efficient modulation applications
First Claim
1. A communication system comprising:
- a transmitter that transmits both wideband data and narrowband data on a link;
a receiver that receives said wideband data and said narrowband data on said link, and demultiplexes said wideband data and said narrowband data into separate data streams so that said link effects transmission of a narrowband channel and a wideband channel and said communication system achieves higher relative availability of said narrowband channel by utilizing different modulation and error control coding formats on said narrowband data and said wideband data.
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Accused Products
Abstract
A communication system includes a transmitter that transmits both wideband data and narrowband data on a link and a receiver that receives the wideband data and the narrowband data on the link. The receiver demultiplexes the wideband data and the narrowband data into separate data streams so that the link effects transmission of a narrowband channel and a wideband channel. The system achieves high link availability on a link using bandwidth efficient modulation by using a more robust modulation format for the narrowband channel to enable higher link availability for the narrowband channel (carrying the narrowband data on the link) than for the wideband channel. The link may employ bandwidth efficient modulation or may be compatible with prior art wideband modulation formats.
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Citations
32 Claims
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1. A communication system comprising:
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a transmitter that transmits both wideband data and narrowband data on a link;
a receiver that receives said wideband data and said narrowband data on said link, and demultiplexes said wideband data and said narrowband data into separate data streams so that said link effects transmission of a narrowband channel and a wideband channel and said communication system achieves higher relative availability of said narrowband channel by utilizing different modulation and error control coding formats on said narrowband data and said wideband data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmitter for a communication system, comprising:
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a wideband symbol mapper that maps wideband data to wideband frames using symbols for a higher order modulation format;
a narrowband symbol mapper that maps narrowband data to narrowband frames using symbols for a lower order modulation format;
a data formatter that multiplexes said narrowband frames and said wideband frames together into a single stream of coded symbols using symbols for both said higher order modulation format and said lower order modulation format. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A receiver for a communication system, comprising:
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a data demulitplexer wherein;
said data demulitplexer detects a beginning of narrowband frames in a single data stream of narrowband frames and wideband frames, said wideband frames comprising symbols of a wideband modulation format; and
said data demulitplexer separates said narrowband frames from said wideband frames; and
wherein said narrowband frames comprise symbols of a narrowband modulation format that provides more reliable resolution of symbols than that for the wideband modulation format of the symbols of said wideband frames. - View Dependent Claims (17, 18, 19, 20)
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21. A communication system comprising:
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a wideband symbol mapper that maps wideband data to wideband frames using symbols for a first modulation format;
a narrowband symbol mapper that maps narrowband data to narrowband frames using symbols for a second modulation format;
a data formatter that multiplexes said narrowband frames and said wideband frames together into a single stream of data coded symbols using symbols for both said first modulation format and said second modulation format;
a data demulitplexer wherein;
said data demulitplexer detects a beginning of narrowband frames in the single data stream of narrowband data coded symbols and wideband data coded symbols, said wideband data coded symbols comprising symbols of said first modulation format and said narrowband data coded symbols comprising symbols of said second modulation format; and
said data demulitplexer separates said narrowband data coded symbols from said wideband data coded symbols, and wherein said second modulation format provides more reliable resolution of symbols than that for said first modulation format. - View Dependent Claims (22, 23, 24)
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25. A satellite communication system, comprising:
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a transmitter including;
a wideband symbol mapper that maps wideband data to wideband frames using symbols for a first modulation format;
a narrowband symbol mapper that maps narrowband data to narrowband frames using symbols for a second modulation format;
a data formatter that multiplexes said narrowband frames and said wideband frames together into a single stream of coded symbols using symbols for both said first modulation format and said second modulation format; and
a wideband modulator that modulates a carrier using said first modulation format and said second modulation format; and
a receiver having a wideband demodulator and including;
a data demulitplexer wherein;
said data demulitplexer receives from said demodulator a reconstructed single data stream of narrowband frames and wideband frames, said wideband frames comprising data coded symbols of said first modulation format and said narrowband frames comprising data coded symbols of said second modulation format;
said data demulitplexer detects a beginning of narrowband frames in said reconstructed single data stream of narrowband frames of data coded symbols and wideband frames of data coded symbols; and
said data demulitplexer separates said narrowband data coded symbols from said wideband data coded symbols, and wherein said second modulation format provides more reliable resolution of symbols than that for said first modulation format.
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26. A method for achieving high link availability on a link, comprising the step of:
formatting narrowband data and wideband data together into a single data stream using a different symbol mapping for the narrowband data than for the wideband data to enable higher availability for a narrowband channel carrying the narrowband data on the link. - View Dependent Claims (27, 28, 29, 30, 31, 32)
Specification