Method and apparatus to generate virtual sector wide static beams using phase shift transmit diversity
First Claim
Patent Images
1. A transmitter, comprising:
- a first antenna and a first transformer associated with the first antenna; and
a second antenna and a second transformer associated with the second antenna, the first transformer and the second transformer being configured to receive a same signal and phase shift the signal to produce a plurality of phase shifted signals, each of the phase shifted signals having a phase that changes over time, the first antenna and the second antenna being spaced apart by a desired column distance and mapped to a first logical antenna port, the first antenna and the second antenna being configured to send the plurality of phase shifted signals such that (i) a first resultant beam formed signal from the first logical antenna port has a transmit power equal to a sum of a transmit power of the first antenna and a transmit power of the second antenna, and (ii) the first resultant beam formed signal has a same time averaged beam shape as a beam formed signal from one of the first antenna and the second antenna.
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Abstract
In one embodiment, the method includes receiving a signal, and generating first and second transmission signals from the received signal. The first signal has a fixed phase, and the second signal has a phase that changes over time. The first and second signals are sent from first and second antennas, respectively.
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Citations
20 Claims
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1. A transmitter, comprising:
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a first antenna and a first transformer associated with the first antenna; and a second antenna and a second transformer associated with the second antenna, the first transformer and the second transformer being configured to receive a same signal and phase shift the signal to produce a plurality of phase shifted signals, each of the phase shifted signals having a phase that changes over time, the first antenna and the second antenna being spaced apart by a desired column distance and mapped to a first logical antenna port, the first antenna and the second antenna being configured to send the plurality of phase shifted signals such that (i) a first resultant beam formed signal from the first logical antenna port has a transmit power equal to a sum of a transmit power of the first antenna and a transmit power of the second antenna, and (ii) the first resultant beam formed signal has a same time averaged beam shape as a beam formed signal from one of the first antenna and the second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmitter, comprising:
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a first antenna; a second antenna offset by a desired angle from the first antenna; a first transformer associated with the first antenna; and a second transformer associated with the second antenna and a first transformer, the first transformer and the second transformer being configured to receive a same signal and phase shift the signal to produce a plurality of phase shifted signals, each of the phase shifted signals having a phase that changes over time, the first antenna and the second antenna being mapped to a first logical antenna port and configured to send the plurality of phase shifted signals such that (i) a first resultant beam formed signal from the first logical antenna port has a transmit power equal to a sum of a transmit power of the first antenna and a transmit power of the second antenna, and (ii) the first resultant beam formed signal has a same time averaged beam shape as a beam formed signal from one of the first antenna and the second antenna. - View Dependent Claims (10)
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11. A method, comprising:
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receiving, by a first antenna and a second antenna, a same signal, the first antenna including a first transformer, the second antenna including a second transformer; generating, by the first transformer and the second transformer, a plurality of phase shifted signals based on the received signal, each of the phase shifted signals having a phase that changes over time, the first antenna and the second antenna being spaced apart by a desired column distance and mapped to a first logical antenna port; and sending, by the first antenna and the second antenna, the plurality of phase shifted signals such that (i) a first resultant beam formed signal from the first logical antenna port has a transmit power equal to a sum of a transmit power of the first antenna and a transmit power of the second antenna, and (ii) the first resultant beam formed signal has a same time averaged beam shape as a beam formed signal from one of the first antenna and the second antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method, comprising:
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receiving, by a first antenna and a second antenna, a same signal, the second antenna being offset by a desired angle from the first antenna, the first antenna including a first transformer, the second antenna including a second transformer, the first antenna and the second antenna being mapped to a first logical antenna port; generating, by the first transformer and the second transformer, a plurality of phase shifted signals, each of the phase shifted signals having a phase that changes over time; and sending, by the first antenna and the second antenna, the plurality of phase shifted signals such that (i) a first resultant beam formed signal from the first logical antenna port has a transmit power equal to a sum of a transmit power of the first antenna and a transmit power of the second antenna, and (ii) the first resultant beam formed signal has a same time averaged beam shape as a beam formed signal from one of the first antenna and the second antenna. - View Dependent Claims (20)
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Specification