System and method for digital memorized predistortion for wireless communication
First Claim
1. A system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device, wherein the wireless transmission includes use of a power amplifier having nonlinear characteristics, the system comprising:
- memory for storing digitally-indexed information, wherein the digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated;
first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory;
second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal, wherein the second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal.
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Accused Products
Abstract
An embodiment of the invention is a system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device and including use of a power amplifier having nonlinear characteristics. The system includes memory for storing digitally-indexed information. The digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated. The system further includes first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory, and second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal. The second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal.
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Citations
27 Claims
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1. A system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device, wherein the wireless transmission includes use of a power amplifier having nonlinear characteristics, the system comprising:
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memory for storing digitally-indexed information, wherein the digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated;
first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory;
second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal, wherein the second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A portable electronic device having wireless communication capabilities, the portable electronic device comprising:
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a processor for executing commands that direct operations of the portable electronic device;
a wireless transmission stage that includes a power amplifier having nonlinear characteristics;
memory for storing digitally-indexed data, including digitally-indexed information that reflects nonlinear characteristics of the power amplifier; and
code stored in the memory that directs the processor to;
determine, given a first signal that includes information to be communicated wirelessly, a correction contribution based on the signal and on the digitally-indexed information that reflects nonlinear characteristics of the power amplifier; and
pre-compensate for the nonlinear characteristics of the power amplifier, based on the correction contribution, to obtain a second signal, wherein the wireless transmission stage will transmit wirelessly based on the second signal. - View Dependent Claims (21)
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22. In a portable mobile device, a method for processing signals in preparation for wireless transmission, wherein the wireless transmission includes use of a power amplifier, the method comprising:
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maintaining a lookup table that contains pre-computed distortion contributions, the distortion contributions being for distorting of signals to thereby pre-compensate the signals for nonlinear characteristics of the power amplifier;
accepting a value that reflects information to be communicated, the value hereinafter referred to as original value;
generating a lookup-table key based on the original value, wherein the lookup-table key is digital;
retrieving from the lookup table, using the lookup-table key, a pre-computed distortion contribution for the original value;
distorting the original value based on the pre-computed distortion contribution to obtain a distorted value to pre-compensate for the nonlinear characteristics of the power amplifier; and
wirelessly transmitting based on the distorted value. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification