BEAM SPACE TIME CODING AND TRANSMIT DIVERSITY
First Claim
1. A transmitter comprising:
- a generator configured to generate a transmit signal stream;
a transmit diversity encoder configured to receive the transmit signal stream and configured to generate a plurality, G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; and
a plurality of beamforming encoders, each of the plurality of beamforming encoders configured to receive one of the plurality of transmit diversity/space-time encoded transmit streams and generate a plurality, K, of weighted substreams to beamform the one of the plurality of transmit diversity/space-time encoded transmit streams.
1 Assignment
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Accused Products
Abstract
Methods and apparatus for increasing diversity gain at a receiver by applying beamforming to transmit diversity space-time coded signals. Transmit diversity can be provided at a signal source by space-time coding the signal. A transmit signal is space-time coded over a plurality of space-time antenna groups, with each space-time antenna group associated with a specific space-time code. The signal at each space-time antenna group is beamformed over the plurality of antenna in the space-time antenna group. Each of the plurality of antenna in a space-time antenna group is weighted with a distinct weight, relative to the other antenna in the space-time group. Each weight can have a distinct amplitude, phase, or combination of amplitude and phase. The weights can be static or dynamic. The dynamic weights can vary amplitude, phase, or a combination of amplitude and phase of each weight over time.
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Citations
29 Claims
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1. A transmitter comprising:
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a generator configured to generate a transmit signal stream; a transmit diversity encoder configured to receive the transmit signal stream and configured to generate a plurality, G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; and a plurality of beamforming encoders, each of the plurality of beamforming encoders configured to receive one of the plurality of transmit diversity/space-time encoded transmit streams and generate a plurality, K, of weighted substreams to beamform the one of the plurality of transmit diversity/space-time encoded transmit streams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of introducing transmit diversity, the method comprising:
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generating a transmit stream; dividing the transmit stream into a plurality of G signal streams; transmit diversity/space-time encoding the G signal streams; beamforming each of the G signal streams over K antennas; and transmitting the G beamformed signals. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A transmitter, the system comprising:
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means for generating a transmit stream; means for transmit diversity/space-time encoding the transmit stream to generate G encoded transmit streams; means for beamforming each of the G encoded transmit streams to generate G beamformed groups; and a plurality of antennas for transmitting the G beamformed groups. - View Dependent Claims (25, 26, 27)
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28. A computer readable media including instructions thereon configured to cause a device to provide transmit diversity, the instructions comprising:
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instructions for transmitting G signal streams; instructions for transmit diversity/space-time encoding the G signal streams; and instructions for weighting each of the G signal streams with a corresponding complex weight vector to beamform each of the G signal streams. - View Dependent Claims (29)
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Specification