Method and apparatus for providing time diversity
First Claim
1. A method of transmitting digital signal information to a receiver with use of a plurality of M antennas, the method comprising the steps of:
- applying a channel code to a digital signal to produce one or more symbols;
forming M copies of a symbol;
weighting each of the M copies of the symbol with a distinct time varying function to form M weighted symbol copies; and
substantially simultaneously transmitting M signals with M different antennas, each transmitted signal based on a distinct one of the M weighted symbol copies.
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Accused Products
Abstract
The invention provides a method and apparatus for transmitting digital signal information to a receiver using a plurality of antennas. The invention involves applying a channel code to a digital signal producing one or more symbols. A plurality of symbol copies is made and each copy is weighted by a distinct time varying function. Each antenna transmits a signal based on one of the weighted symbol copies. Any channel code may be used with the invention, such as a convolutional channel code or block channel code. Weighting provided to symbol copies may involve application of an amplitude gain, phase shift, or both. The present invention may be used in combination with either or both conventional interleavers and constellation mappers.
173 Citations
34 Claims
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1. A method of transmitting digital signal information to a receiver with use of a plurality of M antennas, the method comprising the steps of:
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applying a channel code to a digital signal to produce one or more symbols; forming M copies of a symbol; weighting each of the M copies of the symbol with a distinct time varying function to form M weighted symbol copies; and substantially simultaneously transmitting M signals with M different antennas, each transmitted signal based on a distinct one of the M weighted symbol copies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising:
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a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of M information symbol weighting means, coupled to the channel coder, each such means for weighting a symbol with a distinct time varying function; a plurality of M antennas, each coupled to a symbol weighting means, for transmitting substantially simultaneously M signals based on weighted symbols. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of transmitting digital signal information to a receiver with use of a plurality of antennas, the method comprising the steps of:
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applying a channel code to a digital signal to produce one or more symbols; forming one or more copies of a symbol; phase-shifting one or more copies of the symbol based on a distinct time varying function to form one or more phase-shifted symbol copes; and substantially simultaneously transmitting a plurality of signals each with a different antenna, one or more transmitted signal reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function. - View Dependent Claims (26, 27)
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28. A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising:
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a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal; a plurality of information symbol phase-shifting means, coupled to the channel coder, each such means for phase-shifting a symbol in accordance with a distinct time varying function; and a plurality of antennas for substantially simultaneously transmitting a plurality of signals, one or more transmitted signals reflecting a phase-shifted symbol copy and zero or more transmitted signals reflecting copies of a symbol which are not phase-shifted based on a distinct time varying function. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification