Linear Frequency Modulation Modulator for Low Power Wireless Transmission
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Solution Overview
Problem
Conventional wireless communication technologies face challenges in achieving long-distance signal transmission while minimizing power consumption, as existing methods like direct sequence spread spectrum require higher power consumption for long-distance transmission.
Innovation Solution
A modulator generates a target linear frequency modulation signal with a frequency varying linearly over time, determined by initial frequency, frequency stepping, bandwidth, and spreading factor, and a demodulator processes this signal to achieve long-distance transmission with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If direct sequence spread spectrum is used to achieve long-distance signal transmission, then transmission distance is improved, but power consumption increases
Solution Approach 1:
The patent changes the modulation parameters from conventional GFSK to linear frequency modulation with specific frequency stepping relationships. By adjusting the frequency deviation and modulation index parameters to satisfy specific mathematical relationships (frequency stepping = bandwidth/spreading factor), the system achieves better spectral efficiency and longer transmission distance without proportionally increasing power consumption
Solution Approach 2:
The patent implements dynamic frequency adjustment where the carrier frequency varies linearly over time according to a controlled frequency stepping pattern. This dynamic frequency modulation creates a chirp signal that spreads the spectrum over time, improving distance coverage while maintaining controlled power consumption through efficient frequency utilization
2Use of energy by moving object
If GFSK modulation is used to reduce power consumption, then power consumption is improved, but transmission distance deteriorates
Solution Approach 1:
The patent transforms the static GFSK modulation parameters into dynamic linear frequency modulation parameters. By setting the frequency deviation and modulation index to satisfy specific relationships (frequency stepping determined by bandwidth and spreading factor), the system achieves extended transmission distance while maintaining low power consumption through more efficient spectral utilization
Solution Approach 2:
The patent employs periodic chirp signals with linear frequency modulation that sweep through a defined bandwidth over a specific time period. This periodic frequency sweeping creates better signal detection capability at the receiver, extending transmission distance without requiring continuous high power output, thus maintaining low power consumption
Data Source
AI summary
The invention discloses a modulator, a demodulator and a wireless communication system. The wireless communication system comprises a modulator and a demodulator. The modulator is suitable for generating a target linear frequency modulation signal, wherein the target linear frequency modulation signal is a signal of which the frequency is varied linearly over time, wherein the phase of the target linear frequency modulation signal is determined by an initial frequency and a frequency stepping of the target linear frequency modulation signal, and the frequency stepping is determined by the bandwidth of the target linear frequency modulation signal and the spreading factor of the target linear frequency modulation signal. The demodulator is suitable for demodulating the target linear frequency modulation signal. According to the scheme, power consumption can be reduced while long-distance signal transmission is realized.