Analog radio frequency signal generation method and system

Abstract

The invention discloses an analog radio frequency signal generation method and system. The method comprises the following steps of: upsampling a baseband signal to acquire a first digital signal, wherein the sampling rate of upsampling is N times of original sampling rate of the baseband signal, and N is more than 1; downsampling according to the original sampling rate after the first digital signal is subject to time-delay and power attenuation so as to acquire a second digital signal; multiplying the second digital signal by related factors to acquire a third digital signal, wherein the related factors comprise a fading sequence of multipath fading caused by a multipath environment of a channel; and converting the multiplied third digital signal into an analog radio frequency signal to output. The analog radio frequency signal generation method and system, disclosed by the invention, realize the aim of modeling a process of transmitting a signal through the channel, and ensures thatthe complexity of modeling the process of transmitting the signal through the channel is greatly reduced on the premise that better performance is obtained.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an analog radio frequency signal generation method and system for realizing signal cross-channel modeling. Background technique [0002] The wireless channel is the transmission medium of mobile communication. All information is transmitted in the channel. The performance of the channel directly determines the quality of the communication. Therefore, it is usually necessary to understand the characteristics of the channel and simulate it accurately, and then simulate the signal in the channel. Simulation during transmission. The simulation channel is mainly to determine the impulse response of the channel to be simulated, convolve the transmission signal with the channel impulse response, realize the simulation of the signal transmission process in the channel, and realize the signal transmission test according to the simulated signal transmission process etc. purpose. [...

AI Technical Summary

Problems solved by technology

[0019] Since the baseband signal and channel have more sampling points, this scheme is closer to the actual analog signal and channel, and can effectively improve the time resolution of the channel impulse response. N is the multiple of upsampling, when N>1) the sampling rate is upsampled, the complexity is N times that of the previous scheme, so it brings great difficulties to realize the simulation of the signal transmission process in the channel

[0020] At the same time, for multiple-input multiple-output MIMO scenarios, the existing solutions usually have the same upsampling factor for multiple signals, so when the bandwidths of multiple signals are different, the sampling rates of multiple signals are different.

For a channel with time delay, the sampling rate of multiple signals is different, resulting in different quantized time delay sample point values, and frequency domain correlation will also be different, which will also affect the simulation of the RF signal transmission process in the channel

[0021] It can be seen that the disadvantage of the existing technology is mainly that the complexity is low and the accuracy is low, or the accuracy is high and the complexity is high, and a good compromise between complexity and performance cannot be achieved.

Images