Multi-Mode Transmitter Architecture for GMSK and EDGE Power Control
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Solution Overview
Problem
Current wireless communication devices face challenges in implementing a common transmitter architecture that can support multiple modulation schemes, such as GSM and EDGE, due to the need for different power amplifier modes, leading to inefficiencies and increased power consumption.
Innovation Solution
A configurable transmitter architecture that supports both polar-lite and full-polar modulation schemes by using a dual-mode or saturated power amplifier, allowing for programmable configuration of amplitude and phase modulation based on the selected PA mode, enabling efficient power control and modulation in various transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a highly linear power amplifier is used to transmit signals with both PM and AM components, then transmission signal quality is improved, but power consumption increases significantly
Solution Approach 1:
The system dynamically switches between linear and non-linear PA modes based on the modulation scheme being used. A mode selection mechanism determines whether to operate in linear mode (for AM+PM signals) or non-linear saturated mode (for PM-only signals), allowing the PA characteristics to adapt to the specific transmission requirements and optimize power efficiency while maintaining signal quality when needed
Solution Approach 2:
The invention changes the operating parameters of the power amplifier by switching between linear and non-linear modes. This parameter change allows the system to use a highly linear PA only when necessary (for AM+PM transmission) and operate in efficient non-linear mode otherwise, directly addressing the power consumption issue while preserving transmission quality when required
2Use of energy by moving object
If a non-linear saturated power amplifier is used for GMSK modulation, then power efficiency is improved, but the system cannot transmit signals with both PM and AM components
Solution Approach 1:
The system achieves multi-functionality by enabling a single non-linear PA to support both PM-only modulation (GMSK) and AM+PM modulation (EDGE) through configurable modes. The PA can operate in non-linear saturated mode for PM efficiency or be reconfigured to support AM+PM transmission, making the system universal and adaptable to different modulation requirements without needing separate hardware for each mode
3Adaptability or versatility
If a highly linear power amplifier is used to support EDGE modulation with AM and PM components, then modulation capability is improved, but battery life is drastically reduced
Solution Approach 1:
The system dynamically adapts the PA operating mode based on the active modulation scheme. When EDGE modulation requiring AM+PM capability is detected, the system switches to linear mode to maintain modulation integrity. When GMSK PM-only modulation is used, it switches to non-linear saturated mode to maximize power efficiency and extend battery life, thus dynamically optimizing the trade-off between capability and duration
4Adaptability or versatility
If multiple PA designs are used to support different modulation schemes, then modulation scheme support is improved, but device complexity increases
Solution Approach 1:
The invention employs a single universal PA design that can operate in multiple modes (linear and non-linear) to support different modulation schemes. This eliminates the need for separate PA designs for different modulations, reducing device complexity while maintaining the ability to support both GMSK and EDGE modulation schemes through software or hardware reconfiguration
Data Source
AI summary
A multi-mode transmitter architecture is configurable for multiple modulation modes using either polar or polar-lite modulation. Multiplexed signal paths and reconfigurable components are controlled for performance in GMSK and EDGE burst modes. Polar-lite EDGE modulation is programmed by setting a multiplexer coupling a first amplitude modulated signal path with a frequency modulated signal path input to a dual-mode power amplifier for amplification of the combined EDGE transmission signal. In full-polar EDGE modulation, amplitude modulated signal is multiplexed into a second amplitude modulated signal path for A/D conversion and comparison with a polar feedback signal coupled from the power amplifier output. The resulting comparison is applied to a power control port of the power amplifier to amplitude modulate the EDGE transmission output. Multiplexers are configured to disconnect the amplitude modulated paths when operating in GMSK signaling for both full-polar and polar-lite modulation. Multiplexers selectively couple power feedback into the second amplitude modulated signal path to provide power control and output power ramping for burst transmissions.