Radio Transmitter Phase Modulation via Frequency Shift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radio integrated circuits lack the capability to perform phase modulation, requiring external components and increasing cost and space, while also potentially causing amplitude differences between binary states that need adjustment for proper receiver detection.
Innovation Solution
A method and device that simulate phase modulation by successively transmitting a main frequency and an offset frequency with a suitable frequency difference to achieve a given phase shift, using a radio integrated circuit and microcontroller to generate and control these frequencies, allowing for programmable frequency modulation and amplitude adjustment to minimize spectrum and amplitude changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase modulation is implemented using external components (LC/RC phase shift, variable capacitance diodes), then phase modulation capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the phase modulation function into the radio integrated circuit by utilizing its existing frequency modulation capability. Instead of using separate external components for phase modulation, the solution combines the phase modulation function with the frequency modulation function already present in the radio IC, thereby reducing overall device complexity while maintaining phase modulation capability.
Solution Approach 2:
The patent replaces the mechanical/analog external components (LC/RC phase shift circuits, variable capacitance diodes) with a digital/control-based approach. The phase modulation is achieved by controlling the frequency of the carrier signal through digital means or control circuits integrated within the radio IC, substituting the traditional analog phase shift mechanism with a more integrated solution.
2Adaptability or versatility
If phase modulation is implemented using I-Q modulation with two carriers, then phase modulation capability is achieved, but device complexity and space consumption increase
Solution Approach 1:
The patent combines the phase modulation function with the frequency modulation function already present in the radio integrated circuit. This merging eliminates the need for separate I-Q modulation circuits and two carrier generation paths, thereby significantly reducing the space required on the printed circuit board while maintaining phase modulation capability.
Solution Approach 2:
The patent makes the frequency modulation capability of the radio integrated circuit universal by enabling it to perform both frequency modulation and phase modulation functions. This multi-functionality eliminates the need for dedicated phase modulation hardware, reducing the overall circuit area required for the system.
3Ease of manufacture
If frequency modulation is used to simulate phase modulation, then existing radio integrated circuits can be utilized, but amplitude differences between binary states occur requiring adjustment
Solution Approach 1:
The patent employs feedback mechanisms to monitor and adjust the amplitude of the modulated signal. By using feedback from the signal generation process, the system can automatically compensate for amplitude differences between binary states, ensuring consistent signal levels without requiring manual amplitude adjustment during manufacturing.
Solution Approach 2:
The patent utilizes parameter changes within the radio integrated circuit to control the amplitude characteristics of the modulated signal. By dynamically adjusting circuit parameters such as gain, bias, or impedance during operation, the system can compensate for amplitude differences between binary states, eliminating the need for precise manual amplitude adjustment during manufacturing.
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 simulation of phase modulation within existing radio integrated circuits, reducing the need for external components and amplitude adjustments, while maintaining compatibility with receivers and minimizing the spectrum and bandwidth of the modulated signal.
Implementation Method 1
a radio integrated circuit for generating frequency modulated signals
Implementation Method 2
simulation of a phase modulation of a radio carrier by the successive transmission of a main frequency and of an offset frequency
Data Source
AI summary
A radio transmission method which includes a steps of simulation of a phase modulation of a radio carrier by the successive transmission of a carrier of a main frequency f and of a carrier of an offset frequency f+Δf, the offset frequency having a frequency difference suitable for simulating a given phase shift of the main frequency at the end of a given time T. The invention further relates to a radio transmission device for implementing the method which includes a radio integrated circuit for generating programmable frequency modulation, means for programming, in this radio integrated circuit, the main frequency f and the offset frequency f+Δf and means for driving this radio integrated circuit in order to generate the frequencies as a function of the signal to be transmitted.