System and method for antenna diversity using joint maximal ratio combining
First Claim
1. A radio communication device comprising:
- a. N plurality of antennas;
b. a baseband signal processor that generates transmit signals and that recovers data from receive signals; and
c. a radio transceiver coupled to the baseband signal processor that upconverts the transmit signals for transmission via N plurality of antennas and downconverts signals received by the N plurality of antennas to produce receive signals;
d. wherein the baseband signal processor applies a transmit antenna vector to weight a baseband signal to be transmitted simultaneously from each of N plurality of antennas, the transmit antenna weight vector comprising a complex transmit antenna weight for each of the N plurality of antennas, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency across a bandwidth of the baseband signal, thereby generating N transmit signals each of which is weighted across the bandwidth of the baseband signal such that at substantially all frequencies of the baseband signal, the sum of the power of the transmit signals across the N plurality of antennas is equal to a constant.
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Abstract
A composite beamforming technique is provided wherein a first communication device has a plurality of antennas and the second communication has a plurality of antennas. When the first communication device transmits to the second communication device, the transmit signal is multiplied by a transmit weight vector for transmission by each the plurality of antennas and the transmit signals are received by the plurality of antennas at the second communication device. The second communication device determines the best receive weight vector for the its antennas, and from that vector, derives a suitable transmit weight vector for transmission on the plurality of antennas back to the first communication device. Several techniques are provided to determine the optimum transmit weight vector and receive weight vector for communication between the first and second communication devices so that there is effectively joint or composite beamforming between the communication devices.
218 Citations
17 Claims
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1. A radio communication device comprising:
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a. N plurality of antennas;
b. a baseband signal processor that generates transmit signals and that recovers data from receive signals; and
c. a radio transceiver coupled to the baseband signal processor that upconverts the transmit signals for transmission via N plurality of antennas and downconverts signals received by the N plurality of antennas to produce receive signals;
d. wherein the baseband signal processor applies a transmit antenna vector to weight a baseband signal to be transmitted simultaneously from each of N plurality of antennas, the transmit antenna weight vector comprising a complex transmit antenna weight for each of the N plurality of antennas, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency across a bandwidth of the baseband signal, thereby generating N transmit signals each of which is weighted across the bandwidth of the baseband signal such that at substantially all frequencies of the baseband signal, the sum of the power of the transmit signals across the N plurality of antennas is equal to a constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for communicating signals from a first communication device to a second communication device using radio frequency (RF) communication techniques, comprising:
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a. applying a transmit antenna vector to a baseband signal to be transmitted from the first communication device to the second communication device, the transmit antenna weight vector comprising a complex transmit antenna weight for each of the N plurality of antennas, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency across a bandwidth of the baseband signal, thereby generating N transmit signals each of which is weighted across the bandwidth of the baseband signal such that at substantially all frequencies of the baseband signal, the sum of the power of the transmit signals across the N plurality of antennas of the first communication device is equal to a constant; and
b. transmitting the N plurality of transmit signals from the N plurality of antennas to the second communication device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification