Polarized ring adjusting system suitable for narrow-band communication

Abstract

The invention discloses a polarization loop adjustment system suitable for narrowband communication, which includes an intermediate frequency signal source, an intermediate frequency phase detector, a first peak detector, a low-pass filter, a second peak detector, a down converter, a radio frequency synchronization source, First audio amplifier, second audio amplifier, voltage controlled oscillator, power amplifier, comparator, described first peak detector and intermediate frequency phase detector are respectively connected with intermediate frequency signal source, described first peak detector and second The audio amplifier is connected, the second audio amplifier is connected with the power amplifier, the low-pass filter is connected with the intermediate frequency phase detector, the low-pass filter is connected with the first audio amplifier, and the first audio amplifier is connected with the voltage-controlled Oscillation source connection. The present invention prevents the operating bandwidth from being limited by the bandwidth of the phase and amplitude amplifiers through the mutual cooperation among the second peak detector, the audio amplifier, the voltage-controlled oscillator and the power amplifier, so that the polarization loop adjustment system is suitable for narrow-band communication.

Description

technical field [0001] The invention relates to the communication field, in particular to a polarization ring adjustment system suitable for narrowband communication. Background technique [0002] The average efficiency of the polarization ring system is greater than 40%, and the IM3 is about -50dB. If a transistor with very good performance is used, the efficiency can reach more than 50%. Polarization loop technology has been used in high-power commercial medium-wave transmitters. If the response level is reduced over the required broadband and there is sufficient feedback, it can also be used in VHF and UHF high-efficiency multi-carrier amplifiers. Because It is difficult to express the wideband signal with amplitude and phase. It is usually used in a single carrier system, but when the frequency is high, especially for small signals, it is difficult to detect the phase difference. Since the working bandwidth of the polarization loop is limited by the bandwidth of the pha...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the working bandwidth of the polarization loop is limited by the bandwidth of the phase and amplitude amplifiers, and cannot be applied to narrowband communication systems. and the bandwidth limitation of the amplitude amplifier, making the polarization loop adjustment system suitable for narrowband communication

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