System and Method for Antenna Diversity Using Equal Power Joint Maximal Ratio Combining
First Claim
1. A method for communicating a signal between a first communication device having N plurality of antennas and a second communication device using radio frequency (RF) communication techniques, comprising:
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Abstract
An equal gain composite beamforming technique which constrains that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain CBF.
157 Citations
56 Claims
- 1. A method for communicating a signal between a first communication device having N plurality of antennas and a second communication device using radio frequency (RF) communication techniques, comprising:
- 7. A method for communicating signals between a first communication device and a second communication device using radio frequency (RF) communication techniques, comprising:
- 16. A method for communicating signals between a first communication device and a second communication device using radio frequency (RF) communication techniques, comprising:
- 24. A medium encoded with instructions that, when executed, perform a method comprising the step of applying a transmit weight vector to a baseband signal to be transmitted from a first communication device to a second communication device, the transmit 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, wherein the magnitude of the complex transmit antenna weights associated with each antenna is such that the power to be output at each antenna is the same and is equal to the total power to be output by all of the N antennas divided by N.
- 32. A medium encoded with instructions that, when executed, perform a method comprising the steps of:
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43. 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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43. a. applying to a first signal to be transmitted from the first communication device to the second communication device a transmit weight vector, the transmit 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, wherein the magnitude of the complex transmit antenna weights associated with each antenna is such that the power to be output at each antenna is the same and is equal to the total power to be output by all of the N antennas divided by N; b. transmitting the first signal to the second communication device; c. receiving a first response signal at the plurality of antennas of the first communication device transmitted from a first of two antennas of the second communication device; d. deriving a first row of a channel response matrix that describes the channel response between the first communication device and the second communication device; e. transmitting a second signal by the plurality of antennas of the first communication device using a transmit weight vector that is orthogonal to the first row of the channel response matrix, and wherein the transmit weight vector comprises a plurality of complex transmit antenna weights, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency across a bandwidth of the second signal, thereby generating N transmit signals each of which is weighted across the bandwidth of the baseband signal, wherein the magnitude of the complex transmit antenna weights associated with each antenna is such that the power to be output at each antenna is the same and is equal to the total power to be output by all of the N antennas divided by N; f. receiving a second response signal transmitted by a second of the two antennas of the second communication device and deriving therefrom a second row of the channel response matrix; and g. selecting one of the first and second rows of the channel response matrix that provides better signal-to-noise at the second communication device as the transmit weight vector for further transmission of signals to the second communication device. - View Dependent Claims (44, 45, 46, 47, 48, 49)
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- 50. A medium encoded with instructions, that when, executed perform the method comprising steps of:
Specification