Single Local Oscillator Wireless Receiver for Multi-Band Satellite Signals
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Solution Overview
Problem
Existing wireless signal receivers require multiple local oscillators and high sampling frequencies to handle different satellite positioning systems, leading to increased cost and power consumption.
Innovation Solution
A wireless signal receiving device and method that uses a single local oscillation clock to generate intermediate-frequency signals for multiple satellite systems, allowing for lower sampling frequencies and reducing circuit capability and power consumption by utilizing aliasing for harmonic sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple local oscillators and mixers are used to handle different satellite positioning systems, then the receiver can process multiple wireless signals of different frequencies, but the cost and device complexity increase
Solution Approach 1:
The patent employs a single local oscillator that generates multiple intermediate frequencies through frequency division to handle different satellite positioning systems (GPS, Galileo, Glonass, Beidou). This universal approach allows one oscillator to perform the function of multiple oscillators, reducing device complexity while maintaining the capability to process multiple wireless signals of different frequencies
Solution Approach 2:
The patent segments the intermediate frequency spectrum into different bands (first IF band, second IF band, third IF band) that can be selectively used for different satellite systems. By dividing the frequency range and assigning specific bands to specific systems, the receiver can handle multiple signals using a single oscillator through frequency division multiplexing
2Measurement precision
If high sampling frequency is used for analog-to-digital conversion, then signal reconstruction accuracy is improved, but power consumption and circuit capability requirements increase
Solution Approach 1:
The patent changes the sampling frequency parameter based on the intermediate frequency band being processed. Lower sampling frequencies are used for lower IF bands while higher sampling frequencies are used for higher IF bands. This adaptive parameter adjustment maintains signal reconstruction accuracy for each specific frequency range while minimizing overall power consumption compared to using a uniformly high sampling frequency
Solution Approach 2:
The patent applies partial sampling action by using different sampling frequencies for different IF bands rather than applying excessive high sampling frequency to all bands. This partial approach applies the minimum necessary sampling rate for each specific frequency range, reducing unnecessary power consumption while maintaining adequate signal reconstruction accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective reception of multiple wireless signals with reduced circuit requirements and power consumption, while maintaining signal integrity through appropriate frequency shifting.
Implementation Method 1
a mixer operable to generate a mixing signal by processing the reception signal according to a local oscillation clock in which the mixing signal includes a first, second and third intermediate-frequency (IF) signals
Data Source
AI summary
The present invention discloses a wireless signal receiving device and method capable of receiving three or more signals of different central frequencies. An embodiment of said device comprises: a receiving circuit operable to generate a reception signal according to a wireless signal including a first, second, and third wireless signals of different central frequencies; a mixer operable to generate a mixing signal by processing the reception signal according to an oscillation clock in which the mixing signal includes a first, second and third intermediate-frequency (IF) signals and the central frequency of the third IF signal is higher than the other two; and a digital signal generating circuit operable to generate a first, second and third digital signals by processing the first, second and third IF signals according to a sampling frequency in which the sampling frequency is lower than two times the maximum frequency of the third IF signal.