The Optimum pre calibration curve of power amplifier in OFDM system

摘要

Orthogonal frequency division multiplexing (OFDM) technology, a multi carrier signal peak to average ratio, the cost to cover the dynamic range of the amplifier is difficult to accept, after the power amplifier (HPA) dynamic range will be more than the best pre amplifier, the amplifier correction curve is no longer the inverse function curve, curve is no longer linear synthesis line. The actual pre calibration curve depends on the amplitude distribution curve of the multi carrier signal CCDF. The paper limits the amplifier input power back off (IBO) to search for the highest MER value. The correction result is compared to the inverse function curve can be obtained MER 9.5dB power amplifier performance improvement, then explains the inverse function method does not make the effect of pre distortion optimal synthesis curve gives the best pre correction and the final power amplifier.