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, in number G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream;
a timing and synchronization module configured to generate a timing reference;
a weight matrix generator configured to generate a plurality of weight vectors including at least one varying weight vector, wherein the weight matrix generator is configured to vary the at least one varying weight vector using the timing reference; 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, in number K, of weighted substreams from the one of the plurality of transmit diversity/space-time encoded transmit streams by weighting the one of the plurality of transmit diversity/space-time encoded transmit streams by a corresponding weight vector of the plurality of weight vectors, wherein each weighted substream of the plurality of weighted substreams is configured to couple with a respective antenna of a plurality, in equal number K, of antennas independently of every other weighted substream in the plurality of weighted substreams.
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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
23 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, in number G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; a timing and synchronization module configured to generate a timing reference; a weight matrix generator configured to generate a plurality of weight vectors including at least one varying weight vector, wherein the weight matrix generator is configured to vary the at least one varying weight vector using the timing reference; 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, in number K, of weighted substreams from the one of the plurality of transmit diversity/space-time encoded transmit streams by weighting the one of the plurality of transmit diversity/space-time encoded transmit streams by a corresponding weight vector of the plurality of weight vectors, wherein each weighted substream of the plurality of weighted substreams is configured to couple with a respective antenna of a plurality, in equal number K, of antennas independently of every other weighted substream in the plurality of weighted substreams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. A method of introducing transmit diversity, the method comprising:
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generating a transmit signal stream; generating by a transmit diversity encoder, a plurality, in number G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; generating a timing reference; generating a plurality of weight vectors including at least one varying weight vector, wherein the at least one varying weight vector is varied using the timing reference; beamforming each of the plurality of transmit diversity/space-time encoded transmit streams to generate a plurality, in number K, of weighted streams from the each of the plurality of transmit diversity/space-time encoded transmit streams by weighting the each of the plurality of transmit diversity/space-time encoded transmit streams by a corresponding weight vector of the plurality of weight vectors, wherein each weighted substream of the plurality of weighted substreams is configured to couple with a respective antenna of a plurality, in equal number K, of antennas independently of every other weighted substream in the plurality of weighted substreams; and transmitting each weighted substream. - View Dependent Claims (12, 13, 14, 15, 16, 21)
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17. A transmitter comprising:
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means for generating a transmit signal stream; means for generating a plurality, in number G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; means for generating a timing reference; means for generating a plurality of weight vectors including at least one varying weight vector, wherein the means for generating the plurality of weight vectors comprises means for varying the at least one varying weight vector using the timing reference; means for beamforming each of the plurality of transmit diversity/space-time encoded transmit streams to generate a plurality, in number K, of weighted substreams from the each of the plurality of transmit diversity/space-time encoded transmit streams by weighting the each of the plurality of transmit diversity/space-time encoded transmit streams by a corresponding weight vector of the plurality of weight vectors, wherein each weighted substream of the plurality of weighted substreams is configured to couple with a respective antenna of a plurality, in equal number K, of antennas independently of every other weighted substream in the plurality of weighted substreams; and a plurality of K antennas for transmitting each weighted substream. - View Dependent Claims (18, 22)
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19. A non-transitory computer readable media including instructions thereon configured to cause a device to provide transmit diversity, the instructions comprising:
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instructions for generating a transmit signal stream; instructions for generating a plurality, in number G, of transmit diversity/space-time encoded transmit streams from the transmit signal stream; instructions for generating a timing reference; instructions for generating a plurality of weight vectors including at least one varying weight vector, wherein the instructions for generating the plurality of weight vectors include instructions for varying the at least one varying weight vector using the timing reference; and instructions for beamforming each of the plurality of transmit diversity/space-time encoded transmit streams to generate a plurality, in number K, of weighted substreams from the each of the plurality of transmit diversity/space-time encoded transmit streams by weighting the each of the plurality of transmit diversity/space-time encoded transmit streams by a corresponding weight vector of the plurality of weight vectors, wherein each weighted substream of the plurality of weighted substreams is configured to couple with a respective antenna of a plurality, in equal number K, of antennas independently of every other weighted substream in the plurality of weighted substreams; and instruction for transmitting each weighted substream. - View Dependent Claims (23)
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Specification