Injection-Locked Wireless Link for Simplified Frequency Synchronization
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Solution Overview
Problem
Existing bidirectional wireless communication systems face challenges with increased circuit complexity, difficulty in correcting frequency offset differences, limited lockable ranges in free-running local oscillators, complex frequency locking sequences, and the need for wired clock signal transmission, which complicates the design and operation of wireless communication apparatuses.
Innovation Solution
A bidirectional wireless communication system that employs injection locking to simplify frequency locking by using a free-running oscillation frequency in one apparatus and detecting frequency locking with a communication enable signal, allowing for simpler circuit configurations and reduced complexity in frequency control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency synthesizing based on PLL circuits is used in bidirectional wireless communication systems, then frequency locking can be achieved, but circuit complexity increases
Solution Approach 1:
The patent extracts the frequency locking function from complex PLL-based frequency synthesizing circuits and implements it through a simplified injection locking mechanism. The receiving apparatus uses a free-running local oscillator that is injected with the transmitting carrier, eliminating the need for complex PLL circuits while maintaining frequency synchronization capability.
Solution Approach 2:
The local oscillator in the receiving apparatus generates its own free-running oscillation signal without requiring external clock signals or complex control circuits. The injection locking mechanism allows the oscillator to self-adjust its frequency to match the transmitting carrier frequency through the injected signal, achieving frequency locking autonomously.
2Device complexity
If free-running local oscillators are used in bidirectional wireless communication, then circuit complexity is reduced, but lockable range becomes limited
Solution Approach 1:
The patent introduces dynamic frequency adjustment capability to the free-running local oscillator through the injection locking mechanism. The oscillator can dynamically adapt its frequency range by being injected with the transmitting carrier signal, allowing it to lock onto frequencies beyond its original free-running range while maintaining circuit simplicity.
Solution Approach 2:
The injection signal amplitude and frequency parameters are utilized to expand the lockable range of the free-running local oscillator. By adjusting the injection signal characteristics, the oscillator can achieve frequency locking over a broader range while keeping the circuit configuration simple.
3Reliability
If wired clock signal transmission is used for frequency control, then frequency synchronization is achieved, but device design becomes complicated
Solution Approach 1:
The patent replaces the mechanical/wired clock signal transmission system with a wireless injection locking mechanism. The frequency synchronization is achieved through wireless injection of the carrier signal into the local oscillator, eliminating the need for physical clock signal connections and simplifying the overall device design.
Solution Approach 2:
The transmitting carrier signal serves multiple functions: it carries the communication data and simultaneously acts as the injection signal for frequency locking. This multi-functionality eliminates the need for separate clock signal transmission paths, reducing device complexity while maintaining frequency synchronization.
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
This approach enables efficient frequency locking between wireless communication apparatuses, reducing circuit complexity and facilitating reliable data transmission while eliminating the need for wired clock signals, thus enhancing communication capabilities.
Implementation Method 1
let a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of the oscillator to be pulled in the frequency of the injected signal be injection locking
Data Source
AI summary
A bidirectional wireless communication system includes: a first wireless communication apparatus for bidirectional communication configured to multiplex a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, and transmit a resultant transmission signal; and a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from the first wireless communication apparatus into the oscillator, receive the reception signal while variably controlling the free-running oscillation frequency of the oscillator of the second wireless communication apparatus, detect whether the free-running oscillation frequency of the signal of the oscillator of the second wireless communication apparatus has entered the frequency range up to the injection locking to be frequency-locked with a carrier frequency of the injected reception signal, and generate a communication enable signal.