Method for frequency division duplex communications
First Claim
1. In a base transmitter, a method for communicating with one or more remote stations within a system utilizing frequency division duplexing (FDD), the method comprising:
- receiving baseband tone data comprising multiple discrete frequency tones;
deriving a matrix of spatial weights composed of weight vectors corresponding to each of the one or more remote stations; and
multiplying the baseband tone data by the derived matrix of spatial weights to produce weighted tone data for transmission to the one or more remote stations via a forward link channel.
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Abstract
The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system'"'"'s operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequency division duplex (FDD), time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM), spatial diversity, and polarization diversity in various unique combinations. The method provides excellent fade resistance. The method enables changing a user'"'"'s available bandwidth on demand by assigning additional TDMA slots during the user'"'"'s session.
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Citations
28 Claims
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1. In a base transmitter, a method for communicating with one or more remote stations within a system utilizing frequency division duplexing (FDD), the method comprising:
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receiving baseband tone data comprising multiple discrete frequency tones; deriving a matrix of spatial weights composed of weight vectors corresponding to each of the one or more remote stations; and multiplying the baseband tone data by the derived matrix of spatial weights to produce weighted tone data for transmission to the one or more remote stations via a forward link channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a base receiver, a method for communicating with one or more remote stations within a system utilizing frequency division duplexing (FDD), the method comprising:
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receiving, via a reverse link channel, a signal comprising baseband tone data comprising multiple discrete frequency tones; deriving a matrix of spatial weights composed of weight vectors corresponding to each of the one or more remote stations; and multiplying the baseband tone data by the derived matrix of spatial weights to produce despread tone data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of beamforming in a direction from a base station toward a particular remote unit comprising:
developing a complex weight matrix comprising weight vectors for a plurality of remote units in simultaneous contact with said base station according to the equation X=WY, where X is tone data to be modulated and transmitted from the base station, W is said complex weight matrix and Y is baseband tone data. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method of beamforming in a direction from a remote unit toward a base station comprising
developing a complex weight matrix comprising weight vectors for a plurality of remote units in simultaneous contact with said base station according to the equation Y=WX, where Y is tone data to despread tone data at the base station, W is said complex weight matrix and X is baseband tone data.
Specification