A digital radio frequency pulse modulation method and modulator

Abstract

This application discloses a method and modulator for realizing digital radio frequency pulse modulation, including: performing bit width compression processing on the received K-bit digital radio frequency signal to obtain N-bit data Amp; outputting pulse modulation signals ETDM1 and ETDM2 according to the value of Amp; The pulse modulation signal ETDM1 and the pulse modulation signal ETDM2 are respectively amplified by switching power amplifiers and combined for output. The invention first processes the received digital radio frequency signal through a bit width conversion module, compresses K-bit data into N bits, reduces the working clock rate required by the subsequent stage, and reduces the difficulty of implementing a modulator at radio frequency. On this basis, based on the principle of area equivalence and center of gravity coincidence, the N-bit data is mapped to the corresponding pulse modulation signal, which ensures the performance of the modulation signal while simplifying the hardware implementation of the modulator. Further, by generating two channels of pulse modulation signals with reversed noise, noise cancellation is realized through simple logic addition and combination, and the coding efficiency of the modulator is improved.

Description

technical field [0001] The present invention relates to digital signal processing technology, in particular to a method and modulator for realizing radio frequency signal pulse modulation. Background technique [0002] As an important part of the wireless communication system, the radio frequency power amplifier (referred to as the power amplifier) ​​directly determines the quality and work efficiency of the output signal of the wireless communication equipment. Traditional analog functions (such as Class A, Class B and Class AB power amplifiers, etc., collectively referred to as analog power amplifiers) can achieve efficient amplification of constant envelope modulation signals. However, with the continuous improvement of current wireless transmission rate requirements, high-bandwidth, peak-to-average power ratio (PAPR) signals are increasingly used. When dealing with these complex modulation signals, in order to ensure the linear performance of the amplified signal, the a...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a digital radio frequency pulse modulation method and modulator to solve the problems of insufficient precision and complex DSM structure and low coding efficiency in the PWM digital domain, and improve the bandwidth of the modulator while simplifying the system hardware implementation. Internal signal-to-noise ratio and coding efficiency performance to enable effective driving of switching amplifiers, thereby improving the overall efficiency of the modulator

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