Research And Design Of Multi-standard Receiver And Receiving Optimization Algorithm

In recent years,new technologies such as smart cities,artificial intelligence,the internet of everything,and new energy vehicles have emerged,and wireless communication plays an irreplaceable role.The traditional single-mode wireless communication products can no longer meet the needs of current emerging technologies.Currently,the market has higher requirements for power consumption,communication frequency band,and communication bandwidth of wireless communication products,ensuring that communication products can achieve stable,high-speed,efficient,and easy-to-manage effects.Based on this research background,the hardware design and optimization algorithm of wireless communication receivers in the radio frequency field are studied in detail in this thesis.The research work of this thesis is as follows.1.A reconfigurable wireless superheterodyne radio frequency receiver front-end suitable for multi-standard communication is proposed.The receiver can work in the frequency bands of 2.4-2.5 GHz,3.3-3.6 GHz,and 4.8-6.0 GHz,including the frequency bands of various communication standards.The receiver is highly reconfigurable,and the communication band,link gain,and receiving bandwidth can be adjusted by software without changing hardware equipment.Moreover,a separate local oscillator module is set up for the receiver,which can output local oscillator signals of 25 MHz-6.0 GHz.Through the physical test,the error vector magnitude at different frequency points,different rates,and different modulation methods are all less than 1.45%,the phase error is less than 0.93°,and the amplitude error is less than 1.04%.The receiver has extremely high demodulation accuracy.2.The radial basis function neural network is applied to the calibration of a six-port broadband receiver for the first time,and the orthogonal least square algorithm is used to select the center of the network,which solves the problems of large computational complexity and excessive dependence on samples caused by using traditional algorithms to select the center of the network.To verify the calibration performance of the network model for the six-port receiver,the calibration test was carried out on the six-port broadband receiver with the working frequency band of 2.0-8.0 GHz.The error vector magnitude at different signal bandwidth and different frequency points was less than 1.07%,and the best was 0.57%.Compared with the traditional analog domain demodulation,the demodulation accuracy was greatly improved.This calibration algorithm effectively solves the problems of the six-port receiver caused by an aging circuit,narrow working frequency band,and nonlinearity of receiving devices.The accurate demodulation of the six-port broadband receiver is realized in a real sense,which is of great significance to the study of low-power receivers.