Full-digitalized and high-efficiency VHF radio transmitter

Abstract

The invention discloses a full-digitalized and high-efficiency VHF radio transmitter, which belongs to the technical field of wireless communication, and comprises a digital processing module, a radio frequency amplification module, a filter module and an antenna, the digital processing module receives a digitalized signal, the digitalized signal enters a modulator to modulate digital information into a high-speed pulse after digital preprocessing, and a differential digital pulse string is output; and the radio frequency amplification module amplifies the differential digital pulse signal output by the digital processing module, filters the differential digital pulse signal through the filter module to extract a required modulated carrier signal, converts the modulated carrier signal into a single-ended signal, and radiates the single-ended signal through an antenna. The transmitter only comprises the FPGA, the driving amplifier, the S-type power amplifier, the filter and other circuit components, the complexity is reduced, and the reliability is improved; and the digital structure can provide reconfigurable capabilities of frequency, bandwidth, various modulation modes and the like, and the requirements of various application scenes can be met by changing software.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an all-digital, high-efficiency VHF radio transmitter. Background technique [0002] Ultrashort wave radio (VHF radio) is widely used in civil and military communications. It works in the VHF frequency band (30MHz-300MHz). Compared with the shortwave frequency band, this frequency band has good communication quality and is relatively stable. Small impact. In a mobile environment, VHF radio can meet the needs of two or more parties for voice communication. Of course, it can also be used for data and command transmission. It is an important means of ground communication and ground-air coordinated communication. [0003] A VHF radio station is mainly composed of a transmitter and a receiver. The current VHF radio transmitters basically use digital modulation, which can transmit data and digital voice, and a small part still retains the analog FM function...

AI Technical Summary

Problems solved by technology

[0004] The current VHF radio transmitters mainly have the following problems: First, the current VHF radio transmitters have a complex structure and include multiple functional circuits, generally including microprocessors, radio frequency amplifiers, filters, analog-to-digital converters, and voltage-controlled oscillation circuits. The components such as the device, phase-locked loop, IQ modulator, and power amplifier are more difficult to design, and the number of circuit components is large, which also affects the reliability of the VHF radio station.

Second, the current VHF radio transmitters are relatively dedicated in structure, with a narrow application range and lack of reconfigurable capabilities. Reuse in other application scenarios

Third, the radio frequency power amplifiers used in VHF radio transmitters generally work in class A, class B or class C, especially when complex digital modulation methods are used, in order to ensure linearity, power amplifiers generally work in Class A, low efficiency, resulting in high power consumption of the transmitter and high heat dissipation requirements, resulting in an increase in the size and cost of the VHF radio transmitter

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