Digital demodulation method and super regenerative receiver based on multi-bit sampling

Abstract

The invention discloses a digital demodulation method based on multi-bit sampling and a superregenerative receiver using the same. The demodulation method includes the following steps of 1. amplifying and filtering the received signal and removing the high-frequency quenching signal component; 2. sampling the filtered signal and converting the simulation signal into the digital signal; and 3. performing the synchronization and decision processing on the sampled digital signal to obtain the output signal. By means of the demodulation method, the information loss caused by the hard decision can be reduced, the error code can be reduced, and the sensitivity of the receiver is improved.

Description

technical field [0001] The invention belongs to the field of electronic circuits, and in particular relates to a super-regenerative receiver and a signal processing method of the super-regenerative receiver. Background technique [0002] The core of the super regenerative receiver is the super regenerative oscillator (Super Regeneration Oscillator, SRO)), the oscillator works in the state of intermittent oscillation, and the intermittent frequency is determined by the high frequency quenching signal (Quench Oscillator, QO). Existing super-regenerative receivers use chip-integrated analog demodulation, and the intermediate-frequency signal to be demodulated after down-conversion is mixed with high-frequency extinguished signal components, such as figure 1 shown. At present, super-regenerative receivers usually use chip-level circuit filtering to filter out high-frequency extinguished signal components, and then shape the filtered signal through an analog comparator, and fina...

AI Technical Summary

Problems solved by technology

Although this method is relatively simple, it is easy to cause bit errors when the transmitted signal is weak

When the received power is less than the minimum input power of the receiver, critical jitter distortion will be generated after demodulation, and the time domain waveform is as follows Figure 4 As shown in the figure, an obvious judgment error occurs at the rising edge of the square wave, and bit errors occur where the judgment is wrong

[0004] This is a disadvantage of the traditional super-regenerative receiver-hard judgment causes information loss, which in turn causes bit errors, limiting the sensitivity of the receiver

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