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2-FSK (Frequency Shift Keying) wake-up receiver of tuned radio frequency architecture and demodulation method thereof

A 2-FSK, wake-up receiver technology, applied in FM carrier system, power management, electrical components, etc., to achieve the effect of simple operation, reduced power consumption, and high receiving sensitivity

Active Publication Date: 2019-12-24
陕西亿星远能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of research work mainly focuses on OOK (binary on-off keying, On-Off Keying) modulation, and its sensitivity is usually less than -90dBm

Method used

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  • 2-FSK (Frequency Shift Keying) wake-up receiver of tuned radio frequency architecture and demodulation method thereof
  • 2-FSK (Frequency Shift Keying) wake-up receiver of tuned radio frequency architecture and demodulation method thereof
  • 2-FSK (Frequency Shift Keying) wake-up receiver of tuned radio frequency architecture and demodulation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0067] See figure 1 , figure 1 It is a flowchart of a demodulation method applied to a 2-FSK wake-up receiver of a tuned radio frequency architecture provided by an embodiment of the present invention. It is applied to a 2-FSK wake-up receiver of a tuned radio frequency architecture. As shown in the figure, the demodulation Methods include:

[0068] S1: Acquire 2-FSK radio frequency signal X(t),

[0069] X(t)=Acos(2πf RF t)cos(2πf IF t+θ), 0

[0070] Among them, A represents the amplitude of the radio frequency signal, f RF Indicates the frequency of the RF signal, f IF Represents the frequency of the intermediate frequency signal, θ represents the phase error, and T represents a symbol time;

[0071] See figure 2 , figure 2 It is a schematic diagram of a 2-FSK radio frequency signal provided by the embodiment of the present invention. 2-FSK modulation, that is, binary digital frequency modulation, uses a binary digital baseband signal to control the freque...

Embodiment 2

[0113] Please refer to Figure 5 , Figure 5 It is a structural block diagram of a 2-FSK wake-up receiver with a tuned radio frequency architecture provided by an embodiment of the present invention. As shown in the figure, the 2-FSK wake-up receiver of the tuned radio frequency architecture of this embodiment includes: an antenna 1, a bandpass filter 2, an envelope detector 3 and a control module 4 connected in sequence, wherein the antenna 1 is used to receive 2-FSK radio frequency signal X (t); Band-pass filter 2 is used for carrying out band-pass filter processing to described 2-FSK radio frequency signal X (t), obtains filtered signal; Envelope detector 3 is used for described filtering Envelope detection is performed on the signal to obtain an envelope signal Y(t); the control module 4 is used to sample the envelope signal Y(t) and demodulate it to obtain a demodulated signal.

[0114] Specifically, the control module 4 includes a sampling unit 41, a first frequency fi...

Embodiment 3

[0119] This embodiment is to evaluate the performance of the 2-FSK wake-up receiver of the tuned radio frequency architecture of the above embodiment. In this embodiment, the MSP430RF5969 MCU is selected as the control module, and the AD8309 power detector is used as the envelope Detector to evaluate the performance of a 2-FSK wake-up receiver tuned to the RF architecture. See Table 1 for performance parameters of the MSP430RF5969 and AD8309.

[0120] Table 1. Performance parameters of MSP430RF5969 and AD8309

[0121]

[0122] In a 2-FSK wake-up receiver with a tuned RF architecture, the first frequency filter and the second frequency filter are negligible compared to the sampling time of the ADC.

[0123] Let P D,a and P D,s is the working power and sleep power of the envelope detector, P M,a and P M,s is the working power and sleep power of the microcontroller, R is the bit rate of the receiver, T sa is the sampling conversion time of the ADC of the single-chip micr...

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Abstract

The invention relates to a 2-FSK wake-up receiver of a tuned radio frequency architecture and a demodulation method thereof. The demodulation method comprises the following steps: acquiring a 2-FSK radio frequency signal; obtaining an envelope signal according to the 2-FSK radio frequency signal; uniformly sampling the envelope signal within a symbol time to obtain a vector with N samples; performing first frequency filtering processing and second frequency filtering processing on the vector to obtain a first frequency filtering value and a second frequency filtering value; and comparing the first frequency filtering value with the second frequency filtering value, and outputting a demodulation signal according to a comparison result. The demodulation method provided by the embodiment of the invention is simple and convenient to operate and is irrelevant to phase errors, the 2-FSK awakening receiver provided by the embodiment of the invention avoids a local oscillator consuming power,the power consumption of the awakening receiver is reduced, and the receiver can obtain higher sensitivity by adopting narrowband FSK modulation.

Description

technical field [0001] The invention belongs to the technical field of wake-up receivers, and in particular relates to a 2-FSK wake-up receiver with a tuned radio frequency architecture and a demodulation method thereof. Background technique [0002] In recent years, wake-up receivers (WuR) have emerged as an emerging technology for event-driven IoT sensing applications. It is able to continuously monitor the wireless channel with limited power consumption and wake up the main receiver immediately when the expected traffic arrives. As a result, a lot of idle listening power in IoT is saved, making IoT devices potentially maintenance-free for several years. [0003] Power consumption and RF (Radio Frequency, Radio Frequency) power sensitivity are key requirements for WuR design, which are obviously different from the focus on data rate and energy efficiency per bit when designing traditional receivers. The current work related to WuR can be mainly divided into two categorie...

Claims

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Application Information

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IPC IPC(8): H04L27/14
CPCH04L27/14H04W52/02
Inventor 马涛习汉晨张典典
Owner 陕西亿星远能科技有限公司
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