Radio Transmitter Phase Continuity During Modulation Switching
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Solution Overview
Problem
Radio transmission systems face challenges in meeting radio transmission rules during switching between different modulation schemes, leading to discontinuous modulation processes and potential violations of transmission rules.
Innovation Solution
A radio transmitting apparatus is designed with a modulating circuit that includes a signal routing circuit, a first modulator, a second modulator, and a phase management system to ensure continuous modulation by setting initial phase values and adjusting switching times based on packet structure, thereby maintaining compliance with radio transmission rules during scheme transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching between multiple modulation schemes is implemented in one transmission frame, then communication versatility is improved, but modulation continuity deteriorates during switching
Solution Approach 1:
The patent applies preliminary action by setting the initial phase of the second modulator based on the final phase of the first modulator before switching occurs. The phase management circuit calculates and configures the initial phase value of the second modulator in advance, ensuring that when switching happens, the phase continues smoothly from the first modulation scheme to the second, thereby maintaining modulation continuity while supporting multiple modulation schemes in one frame.
2Ease of operation
If independent initial phase values are used for each modulator, then ease of operation is improved, but radio transmission rule compliance deteriorates during switching
Solution Approach 1:
The patent implements feedback through the phase management circuit that monitors and uses the final phase value of the first modulator to determine the initial phase value of the second modulator. This feedback mechanism ensures that the phase transition between modulation schemes is seamless and compliant with radio transmission rules, while still allowing independent operation of each modulator through the automated phase coordination.
3Adaptability or versatility
If phase switching occurs between modulation schemes, then adaptability is improved, but harmful frequency components are generated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the initial phase parameter of the second modulator based on the final phase parameter of the first modulator. The phase management circuit calculates the appropriate initial phase value that ensures continuous phase transition, thereby maintaining modulation flexibility while preventing the generation of harmful frequency components that would arise from abrupt phase discontinuities.
Data Source
AI summary
The radio transmitting apparatus includes a first initial phase value setting circuit that sets, in the first modulator, an initial value of the phase of the first modulated signal, which is a value at the start of the modulation according to the first modulation scheme. The radio transmitting apparatus includes a second initial phase value setting circuit that sets, in the second modulator, the phase stored in the phase storing circuit as an initial value of the phase of the second modulated signal, which is a value at the start of the modulation according to the second modulation scheme. The radio transmitting apparatus includes a signal gathering circuit that selects and outputs the first modulated signal output from the first modulator and then selects and outputs the second modulated signal output from the second modulator.