System and method for joint compensation of power amplifier's distortion
a power amplifier and distortion technology, applied in the field of telecommunication systems, can solve the problems of power amplifiers with low power efficiency, and increased efficiency of power amplifiers
Active Publication Date: 2015-08-27
KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS +1
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Benefits of technology
The patent describes a system and method for reducing distortion in power amplifiers used in transmitters. The system uses a pre-compensated amplifier to minimize distortion. The receiver then uses compressive sensing algorithms to estimate and compensate for the distortion. This approach ensures efficient use of bandwidth and does not require specific reserving of subcarriers for measurement. The technical effect of this patent is improved quality of transmission with reduced distortion.
Problems solved by technology
Simultaneously, the power efficiency of the PA needs to be maximized since the amplifier consumes most of the power in the RF front-end.
However, power amplifiers have low power efficiency when they are operated in their linear region, and their efficiency increases as they are driven into the nonlinear region close to saturation.
Method used
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[0022]At the outset, it should be understood by one of ordinary skill in the art that embodiments of the present method can comprise software or firmware code executing on a computer, a microcontroller, a microprocessor, or a DSP processor; state machines implemented in application specific or programmable logic; or numerous other forms without departing from the spirit and scope of the method described herein. The present method can be provided as a computer program, which includes a non-transitory machine-readable medium having stored thereon instructions that can be used to program a computer (or other electronic devices) to perform processes according to the method. The machine-readable medium can include, but is not limited to, floppy diskettes, optical disks, CD-ROMs, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, magnetic or optical cards, flash memory, or other type of non-transitory, media or machine-readable medium suitable for storing electronic instructions.
[002...
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The system and method for joint compensation of power amplifier's distortion provides a linearization scheme for transmitter power amplifiers driven by orthogonal frequency division multiplexing signals. A pre-compensated over-driven amplifier is employed at the transmitter. The over-driven amplifier's distortions are considered as a sparse phenomenon and compressive sensing (CS) algorithms are employed at the receiver to estimate and compensate for these distortions. A bandwidth efficient data aided scheme which does not require reserving subcarriers specifically for CS measurements is utilized.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to telecommunication systems, and particularly to a system and method for joint compensation of power amplifier's distortion in an orthogonal frequency division multiplexing (OFDM) telecommunication system.[0003]2. Description of the Related Art[0004]Emerging communication systems intensively use orthogonal frequency division multiplexing (OFDM) technique due to its numerous advantages such as high spectral efficiency, robustness to frequency selective fading, etc, which make it very attractive for the majority of communication systems. However, OFDM signals often result in time-domain wave-forms that have peak to average power ratio (PAPR) of up to 10 dB. These amplitude modulated signals are sensitive to the nonlinear distortions caused by the radio frequency (RF) power amplifier (PA) of the RF front-end. Indeed, the PA needs to linearly amplify the amplitude-modulated signals to avoid hi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H04L27/26H04L25/03H04L1/00
CPCH04L27/2646H04L2025/03414H04L25/03114H04L1/0001H04L27/366H03F1/3241H03F3/245
Inventor ALI, ANUMOWODUNNI, DAMILOLA SADIQHAMMI, OUALIDAL-NAFFOURI, TAREQ YOUSEF
Owner KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS