Method and apparatus for transmitting and receiving high speed data in a CDMA communication system using multiple carriers
First Claim
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1. A wireless transmitter, comprising:
- an encoder for encoding a set of information bits to provide a set of code symbols;
a demultiplexer for providing said set of code symbols in first and second code symbol subsets having different code symbol rates to first and second modulators, said first and second modulators respectively modulating said first and second code symbol subsets according to first and second code symbol rate formats, respectively, wherein said different code symbol rates have a ratio equal a number other than one, to provide modulated first code symbol subset and second code symbol subset;
a transmission subsystem for said modulated first code symbol subset on a first carrier frequency and said modulated second code symbol subset on a second carrier frequency.
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Abstract
The present invention is a novel and improved method and apparatus for transmitting data in a multiple carrier CDMA communication system. In the first implementation of the present invention, the data is encoded and the resulting encoded symbols are divided up and transmitted on different frequencies. The encoded symbols are provided to a symbol repetition means which keeps the symbol rate of data to be transmitted fixed. In a second embodiment, no symbol repetition is provided and variable length Walsh sequences are used to handle data rate variations.
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Citations
15 Claims
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1. A wireless transmitter, comprising:
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an encoder for encoding a set of information bits to provide a set of code symbols;
a demultiplexer for providing said set of code symbols in first and second code symbol subsets having different code symbol rates to first and second modulators, said first and second modulators respectively modulating said first and second code symbol subsets according to first and second code symbol rate formats, respectively, wherein said different code symbol rates have a ratio equal a number other than one, to provide modulated first code symbol subset and second code symbol subset;
a transmission subsystem for said modulated first code symbol subset on a first carrier frequency and said modulated second code symbol subset on a second carrier frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit for modulating an information signal, said circuit comprising:
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a control processor;
an encoder for error-correction encoding of said information signal according to a format determined by said control processor to produce encoded symbols; and
a variable ratio demultiplexer for providing said encoded symbols to a plurality of modulators at different rates, wherein a ratio of said different rates equals a number other than one, wherein said ratio is selected in response to a control signal from said control processor. - View Dependent Claims (8, 9, 10, 11, 13, 14, 15)
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12. A method for modulating an information signal, said method comprising the steps of:
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error-correction encoding said information signal to produce encoded symbols;
providing said encoded symbols to a plurality of modulators at different rates, wherein a ratio of said different rates equals a number other than one; and
modulating said encoded symbols in each of said plurality of modulators according to a different modulation format in response to a symbol rate of said encoded symbols.
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Specification