Zero intermediate frequency transmitter as well as method and apparatus for correcting sideband and local oscillation leakage thereof

Abstract

The invention discloses a zero intermediate frequency transmitter and a correction method and a device of a sideband and the local leakage of the zero intermediate frequency transmitter. The correction method includes the following steps: A. setting the pre-correction parameters of the sideband and the local leakage and receiving the input of base-band digital signals; B. establishing a pre-correction model of the sideband and the local leakage with the pre-correction parameters of the sideband and the local leakage and carrying out pre-correction treatment of the input base-band digital signals with the model; C. treating the base-band digital signals which are carried out the pre-correction treatment into radiofrequency signals; D. receiving at least a part of radiofrequency signals and treating the part of the radiofrequency signals into digital intermediate frequency signals; E. revising the pre-correction parameters of the sideband and the local leakage by making use of the input base-band digital signals or base-band digital signals which are carried out pre-correction treatment and the digital intermediate frequency signals and returning to step B. The device comprises a numerical pre-correction unit and a self-adaptive treatment unit. The method and the device can correct the sideband and local leakage of the zero intermediate frequency transmitter in a real time manner.

Description

technical field [0001] The present invention relates to a system and method for sending digital signals, more specifically, to a zero-IF transmitter and its sideband and local oscillator leakage correction method and device. Background technique [0002] Generally, a mobile communication system, such as a mobile communication base station, consists of baseband processing and a radio frequency front-end. Among them, the radio frequency front-end, which is an important part of the mobile communication system, is divided into two parts: transmitting and receiving. The radio frequency transmission system is responsible for performing radio frequency conversion and power amplification on the baseband signal, and transmitting it through the antenna in the form of microwaves. [0003] The radio frequency transmission system is mainly composed of a low-pass filter, a local oscillator signal source, an IQ quadrature modulator, a variable gain amplifier, a power amplifier, a band-pass...

AI Technical Summary

Problems solved by technology

[0009] However, this automatic calibration method only calibrates the sideband and local oscillator leakage before leaving the factory, and the sideband and local oscillator leakage of analog devices will change after long-term operation. At this time, the correction value stored in the memory unit of the sending board can't correct for sideband and LO leakage well

Images