Single-path tandem type analog pre-distortion system

Abstract

The invention discloses a single-path tandem type analog pre-distortion system. The filter comprises a dielectric substrate, a first nonlinear generator, a phase modulator and a second nonlinear generator, the first nonlinear generator, the phase modulator and the second nonlinear generator are arranged on the upper surface of the dielectric substrate; the first nonlinear generator, the phase modulator and the second nonlinear generator are connected in sequence and form a series circuit structure. The first nonlinear generator uses nonlinearity generated by a first triode in the first nonlinear generator to pre-distort a radio frequency signal in an amplitude expansion mode to obtain a first distortion signal. The phase modulator generates a phase shift signal by changing the phase of thefirst distortion signal, and the second nonlinear generator performs pre-distortion on the phase shift signal in an amplitude expansion mode by using nonlinearity generated by a second triode in thesecond nonlinear generator to obtain an analog pre-distortion output signal; the pre-distortion circuit has the advantages of simple structure, small size, low cost and high pre-distortion precision when acting on broadband modulation signals.

Description

technical field [0001] The invention relates to an analog predistortion system, in particular to a series analog predistortion system with phase compensation. Background technique [0002] The arrival of the 5G era has set the direction for the development of modern wireless communication technologies. High speed, large capacity, low latency and multiple users are the basic requirements of 5G networks. 5G NR (fifth-generation mobile communication technology standard) is based on OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) optimized waveform and multiple access technology. OFDM is widely used in today's 4G LTE and Wi-Fi systems, and can meet the requirements of high-speed and large-capacity transmission. OFDM symbols are superimposed by multiple independent modulated sub-carrier signals. By dividing the channel into several orthogonal sub-channels, the interference between sub-carriers can be effectively reduced, but the sign...

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Problems solved by technology

Schottky diodes can greatly suppress even-order harmonics in self-generated nonlinear signals. Although they are excellent in third-order and fifth-order intermodulation distortion, when they are used in the most widely used When wideband modulated signals, the predistortion accuracy is very poor, so that its application field is greatly limited

In addition, the multi-channel parallel analog predistortion system based on Schottky diodes is realized by a multi-channel parallel circuit structure. Compared with the traditional single-channel analog predistortion system, the circuit structure is too large, which not only increases the cost, but also requires Multiple control voltages need to be adjusted, and the operation process is relatively complicated

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