FPGA Adaptive Predistorter Based on 64QAM Modulation
2010 ◽
Vol 56
(4)
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pp. 387-392
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FPGA Adaptive Predistorter Based on 64QAM ModulationThis paper presents a predistortion technique compensating for nonlinear distortions caused by HPA (High Power Amplifier) in a QAM (Multilevel Quadrature Modulation) system. Investigations were held both with software and hardware tools. It is confirmed by computer simulation that proposed approach produces a faster convergence speed than traditional computer performed algorithms. Predistortion technique based on programmable logic device is a very attractive from the implementation point of view, because of a low amount of required RAM and rapid convergence from a blind start.
2014 ◽
Vol 10
(4)
◽
pp. 143-150
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