Diversity transmission using a single power amplifier
First Claim
1. Apparatus for use in a radio transmitter, comprising:
- a first antenna;
a second antenna;
a power amplifier having an input for receiving a transmit signal and an output signal provided to the first antenna and to the second antenna for diversity transmission of the output signal to a radio receiver; and
a phase shifter for shifting a phase of the output signal by a first amount before transmission over the second antenna so that a relative phase shift exists between the output signal transmitted from the first antenna and the output signal transmitted from the second antenna.
1 Assignment
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Accused Products
Abstract
Diversity radio transmission is accomplished with excellent performance using multiple antennas receiving a transmission signal from a single power amplifier. A data signal to be transmitted is provided to a first antenna, and a phase-shifted version of the data signal is applied a second antenna. The relative phase shift between the data signal transmitted over the two transmit antennas ensures the two antenna signals can be constructively combined at the receiver. In one non-limiting example embodiment, the relative phase shift is determined by processing pilot signals sent along with the data signal and which are transmitted with predetermined phase shifts.
43 Citations
26 Claims
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1. Apparatus for use in a radio transmitter, comprising:
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a first antenna; a second antenna; a power amplifier having an input for receiving a transmit signal and an output signal provided to the first antenna and to the second antenna for diversity transmission of the output signal to a radio receiver; and a phase shifter for shifting a phase of the output signal by a first amount before transmission over the second antenna so that a relative phase shift exists between the output signal transmitted from the first antenna and the output signal transmitted from the second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for use in a radio transmitter that includes a first antenna, a second antenna, and a power amplifier, the method comprising:
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receiving at an input of the power amplifier a signal to be transmitted; providing an output signal from the power amplifier to the first antenna and to the second antenna; diversity transmitting the output signal from the first and second antennas to a radio receiver; and shifting a phase of the output signal by a first phase shift amount before transmission over the second antenna so that a relative phase shift exists between the output signal transmitted from the first antenna and the output signal transmitted from the second antenna. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification