Apparatus and method for improving efficiency of power amplifier operating under large peak-to average power ratio

Abstract

An apparatus and method for improving the efficiency of a power amplifier operating on the basis of a signal of a large peak-to-averagc power ratio (PAR). A main amplification part detects envelope values of an input baseband signal, reduces a peak value of the envelope values of the baseband signal to generate a peak reduced signal, amplifies the generated peak reduced signal, and outputs a first amplified signal. An error correction amplification part amplifies an error signal indicating a difference between the baseband signal and the peak reduced signal, and outputs a second amplified signal. A summing part combines the first amplified signal from the main amplification part and the second amplified signal from the error correction amplification part, such that high amplification efficiency is produced and an amplified output signal with reduced spectral regrowth in which an error is corrected can be outputted.

Description

technical field [0001] The present invention relates to a power amplifier, and in particular to a device and method for increasing the efficiency of a power amplifier operating on a signal with a large peak-to-average power ratio (PAR, peak-to-average power ratio) . Background technique [0002] In a conventional wireless communication system such as a cellular system, a base station uses a power amplifier to communicate with user terminals distributed within a predetermined service area. A power amplifier amplifies a radio frequency (RF) signal used in a communication system to transmit a plurality of signals, and then outputs the amplified RF signal. [0003] In particular, cellular systems that use Code Division Multiple Access (CDMA) or Orthogonal Frequency Division Multiplexing (OFDM, orthogonal frequency division multiplexing) technology must transmit data with a large peak-to-average power ratio (PAR) to connected multiple users sharing the same frequency band. ) of...

AI Technical Summary

Problems solved by technology

However, the problem with the peak reduction technique is that when the PAR of the signal decreases, the bit error rate and spectral regrowth of the signal gradually become higher, which deteriorates the signal characteristics and reduces the transmission efficiency

In other words, there is a limit to the improvement in power amplifier efficiency when peak reduction techniques are used

Images