Method for improving power amplifier efficiency and digital predistortion broadband communicator

Abstract

The present invention discloses a method for increasing the power amplifying efficiency and the digital predistortion broadband communicator thereof. The digital predistortion broadband communicator comprises a digital signal processing module, an envelope signal channel, a forward signal channel, a feedback signal channel and a radio frequency power amplifier. The digital signal processing module is used for receiving the base band IQ complex signal and generating envelope signal, forward signal and feedback signal with carrier frequency after deplexing. The envelope signal channel executes A / D converting and filtering to the envelope signal and comprises a broadband envelop electric power modulator which is used for generating the voltage varying real-time according to the real-time variation of the envelope signal and supplying the voltage to the radio frequency power amplifier as the drain electric voltage offset. As the method of the invention and the digital predistortion broadband communicator adopt a base band crest factor reducing technique, a digital predistortion technique, an envelop tracing technique, a broadband envelop electric power modulating technique and the like, the power amplifying efficiency is greatly increased and the application of the envelop tracing technique in the wideband signal system field is promoted.

Description

technical field [0001] The invention belongs to a method for improving power amplifier efficiency and a base station system transmitter in the field of mobile communication, and specifically relates to a method for improving power amplifier efficiency by applying envelope tracking technology and a digital predistortion broadband transmitter thereof. Background technique [0002] The development of the existing mobile communication technology is changing with each passing day, and the improvement of the efficiency of the transmitter, especially the efficiency of the power amplifier, has always been a constant challenge for the signal transmission technology. Terminal products such as mobile phones have always required high efficiency. With the continuous strengthening of the concept of green environmental protection in the world, resource constraints such as energy shortages, in order to continuously reduce operating costs OPEX (Operating Expense), mobile operators need to imp...

AI Technical Summary

Problems solved by technology

For narrowband applications, switch-mode DC-DC converters can be implemented by delta modulation (delta-M) or pulse width modulation (PWM), but for broadband signals, such high switching frequencies are difficult to achieve, and the second is It will also introduce considerable information loss. For example, for a WCDMA signal or OFDM signal with a bandwidth of 20M, the switching frequency of this traditional switch mode DC-DC converter is at least 100M

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