Remote power amplifier linearization
First Claim
1. A communication system having remote power amplifier linearization, said system comprising:
- at least one user radio having a power amplifier linearizer that applies a transfer function to a modulated data stream, is coupled to a power amplifier, and is configured to transmit a communication signal generated by said power amplifier of said user radio; and
a hub radio configured to receive said communication signal transmitted from said at least one user radio, to generate a signal quality measurement for said communication signal, to formulate commands in response to said signal quality measurement for said communication signal, and to transmit said commands;
wherein said one user radio is further configured to adjust said transfer function of said power amplifier linearizer of said user radio in response to one of said commands so that said user radio power amplifier becomes remotely linearized.
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Accused Products
Abstract
A communication system (20) includes a hub radio (22) that wirelessly communicates with any number of user radios (24). The hub radio (22) monitors signal quality measurements compiled from the communication signals (30′) transmitted from the various user radios (24) and based upon baseband quadrature constellation point error to estimate out-of-band signal energy for the communication signals (30′). The hub radio (22) formulates commands based upon these measurements that instruct the user radios (24) how to adjust their power amplifier linearizers (66) so that their power amplifiers (74) become better linearized to minimize spectral regrowth and insure compliance with a spectral template.
76 Citations
26 Claims
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1. A communication system having remote power amplifier linearization, said system comprising:
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at least one user radio having a power amplifier linearizer that applies a transfer function to a modulated data stream, is coupled to a power amplifier, and is configured to transmit a communication signal generated by said power amplifier of said user radio; and
a hub radio configured to receive said communication signal transmitted from said at least one user radio, to generate a signal quality measurement for said communication signal, to formulate commands in response to said signal quality measurement for said communication signal, and to transmit said commands;
wherein said one user radio is further configured to adjust said transfer function of said power amplifier linearizer of said user radio in response to one of said commands so that said user radio power amplifier becomes remotely linearized. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hub radio for use in a communication system having remote power amplifier linearization, said hub radio comprising:
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a receiver section configured to receive a wireless communication signal and to generate a signal quality measurement that is responsive to said communication signal;
a controller configured to estimate a power amplifier linearizer transfer function in response to said signal quality measurement and to formulate a command in response to said estimated power amplifier linearizer transfer function; and
a transmitter section configured to wirelessly transmit said command. - View Dependent Claims (8, 9, 10, 11, 12, 13, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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14. A user radio for use in a communication system having remote power amplifier linearization, said user radio comprising:
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a power amplifier linearizer adapted to apply a transfer function to a modulated data stream and generate a linearized data stream;
a power amplifier configured to amplify said linearized data stream and generate a communication signal;
a receiver section adapted to receive commands from outside said user radio via wireless communication; and
a controller coupled to said receiver and said power amplifier linearizer, said controller being configured to adjust said transfer function in response to said commands so that said power amplifier becomes remotely linearized.
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15. In a communication system, a method for remote power amplifier linearization used in generating a communication signal transmitted from a first site for receipt at a second site, said method comprising:
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a) receiving said communication signal at said second site;
b) generating a signal quality measurement at said second site, said signal quality measurement being determined from said communication signal received in said receiving activity a);
c) formulating a command at said second site in response to said signal quality measurement;
d) transmitting said command from said second site;
e) receiving said command at said first site;
f) adjusting, at said first site in response to said command, a transfer function applied to a modulated data stream by a power amplifier linearizer;
g) linearizing said modulated data stream in said power amplifier linearizer to generate a linearized data stream;
h) amplifying said linearized data stream in a power amplifier to generate said communication signal; and
i) transmitting said communication signal from said first site.
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Specification