Variable RF Modulator Single Path Multi-Mode Operation
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Solution Overview
Problem
Multi-mode wireless communication devices require separate modulation paths for each communication mode, increasing manufacturing costs and device complexity.
Innovation Solution
A method and system that enable operation in two or more communication modes using a single modulation path within a multi-mode wireless communication device, where parameters such as gain, bandwidth, bias current, and bias voltage of variable components in the RF modulator are dynamically set based on the selected communication mode, allowing the device to process signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate modulation paths are used for each communication mode, then communication mode compatibility is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a universal modulation path that can operate in multiple communication modes (CDMA, GSM, eGSM) by dynamically reconfiguring component parameters rather than providing separate dedicated paths for each mode. The RF modulator, baseband filters, VGAs, and driver amplifiers are designed to be mode-agnostic, with their characteristics adjusted via control signals based on the selected communication mode.
Solution Approach 2:
The patent employs dynamic parameter adjustment of various components including baseband filter bandwidth, VGA gain, driver amplifier bias current, and RF modulator settings. These parameters are changed in real-time based on the selected communication mode to optimize performance for each mode while using the same physical hardware path.
2Adaptability or versatility
If separate modulation paths are used for each communication mode, then communication mode compatibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a universal modulation path that can operate in multiple communication modes (CDMA, GSM, eGSM) by dynamically reconfiguring component parameters rather than providing separate dedicated paths for each mode. The RF modulator, baseband filters, VGAs, and driver amplifiers are designed to be mode-agnostic, with their characteristics adjusted via control signals based on the selected communication mode.
Solution Approach 2:
The patent merges multiple communication mode support into a single integrated modulation path, combining what would traditionally require separate hardware chains into one shared resource. This consolidation reduces the total number of components needed and simplifies the overall device architecture.
3Device complexity
If a single modulation path is used for multiple communication modes, then device complexity is reduced, but parameter adjustment complexity increases
Solution Approach 1:
The patent incorporates control circuits that receive information about the selected communication mode and automatically adjust the parameters of various components accordingly. The system monitors the operational state and makes real-time parameter adjustments to maintain optimal performance across different communication modes.
Solution Approach 2:
The patent pre-configures multiple sets of optimal parameters for different communication modes within the control logic. When a communication mode is selected, the system retrieves and applies the pre-calculated parameter set for that mode, avoiding the need for complex real-time calculations and simplifying the control process.
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AI summary
Techniques are described that allow operation according to two or more different communication modes in a single modulation path of a variable radio frequency (RF) modulator within a multi-mode wireless communication device (WCD). The multi-mode WCD may detect a service signal from a base station within a wireless communication system and select a communication mode in which to operate based on the communication mode of the detected service signal. The techniques described herein enable a digital controller within the RF modulator to set parameters of variable components along the single modulation path of the RF modulator based on the selected communication mode. In this way, the single modulation path of the variable RF modulator may be set to process a baseband signal from a user of the WCD according to the communication mode in which the multi-mode WCD is operating.