Method and apparatus for providing time diversity
AssigneeLucent Technologies Inc.
InventorVijitha Weerackody
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Abstract
The invention provides a method and apparatus for transmitting digital signaling formation 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 which are located at two or more base stations 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.
Claims24
A method of transmitting digital signal information to a receiver with use of a plurality of M antennas, each antenna located at one of a plurality of base stations, at least two of the base stations having an antenna thereat, the method comprising the steps of:
- applying a channel code to a digital signal to produce one or more symbols;
- providing a copy of a symbol at each base station;
- 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 antenna located at a base station, each transmitted signal based on a distinct one of the M weighted symbol copies.
A transmitter for a wireless communication system for transmitting signals to a receiver, the transmitter comprising:
- a plurality of base stations, each having a channel coder for receiving a digital information signal and producing one or more symbols based on said digital information signal, at least two of said plurality of base stations having an antenna thereat;
- an information symbol weighting means at each of said plurality of base stations, coupled to each channel coder, each such means for weighting a symbol with a distinct time varying function;
- and
- said antennas coupled to each of said symbol weighting means, for transmitting substantially simultaneously M signals based on weighted symbols.
Dependencies are inferred from the claim text.