Demodulation and Control Method of Frequency Domain Transmission Signal in Wireless Sensor Node
In order to improve the anti-noise ability of frequency domain transmission signals in wireless sensor network nodes and opti-mize the front-end image and noise signal processing ability,a new signal control and demodulation method is proposed based on the fre-quency domain transmission signals in wireless sensor nodes.The wireless sensor signal is input into the designed filter,and the signal is filtered through the cooperation of capacitor,resistor and operational amplifier.The feedforward compensation path is introduced to form a two-level node signal demodulation circuit.When the output sensing signal power exceeds the standard,the gain bandwidth product can be adjusted by feedforward compensation according to the excess value to realize demodulation.A correction circuit is connected outside the sensor node to control the frequency domain transmission characteristics of the sensing signal to meet the normal operation standard by correcting the capacitance adjustment code.The simulation results show that under 1 V power supply voltage,the center fre-quency of the filter is 2 MHz,the adjacent signal suppression is 55 dB,the mirror signal suppression is 33 dB,the in-band ripple is 0.1 dB,the passband voltage gain is 18 dB,and the working current is 382 μA.It is verified that the proposed method has high frequen-cy domain transmission signal depth processing ability,and is helpful to achieve high-quality communication in wireless sensor networks.
万方数据
维普
