Dual Power Source for Wireless Communication Devices
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Solution Overview
Problem
Wireless communication devices of the TDMA/TDD type do not employ the Envelope Tracking (ET) method for power consumption reduction due to shorter transmission time periods and the space constraints imposed by additional ET power source units, which are not compatible with size reduction goals, especially in portable devices.
Innovation Solution
A wireless communication device structure that includes a transmitter with an orthogonal modulator and power amplifier, a receiver with a demodulator, and a dual power source system where the ET power source outputs fluctuating voltage during transmission and constant voltage during reception, allowing for separate time periods for transmission and reception without overlapping, thus reducing power consumption without increasing the size of the power source unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the ET method is employed for the power amplifier in TDMA/TDD type wireless communication devices, then power consumption is reduced, but the space occupied by the additional ET power source unit increases
Solution Approach 1:
The existing power source unit is made multi-functional by enabling it to perform both conventional constant voltage supply and envelope tracking functions. The power source unit includes a power supply voltage generation circuit that can operate in two modes: providing constant voltage for normal operation and providing envelope tracking voltage for power reduction, thereby eliminating the need for a separate ET power source unit
Solution Approach 2:
The ET function is merged with the existing power source unit by integrating the envelope tracking capability into the power supply voltage generation circuit. This combines the conventional power supply function and the ET power reduction function into a single unified power source unit, reducing overall device space while maintaining power consumption reduction benefits
2Use of energy by moving object
If the transmission time period is extended to make ET method effective, then power consumption reduction is achieved, but the transmission time period becomes too long for TDMA/TDD type devices
Solution Approach 1:
The power source unit dynamically changes its operating parameters by switching between constant voltage mode and envelope tracking mode based on the transmission time period characteristics. During the relatively long transmission time period, the unit switches to envelope tracking mode to reduce power consumption, while adapting to the specific time duration requirements of TDMA/TDD systems
3Power
If a separate ET power source unit is added, then power amplifier efficiency is improved, but the device size increases
Solution Approach 1:
The power source unit is designed with multi-functionality to provide both conventional power supply and envelope tracking power supply capabilities within a single unit, eliminating the need for separate ET power source hardware and thereby maintaining compact device size while improving power amplifier efficiency
Solution Approach 2:
The envelope tracking functionality is merged into the existing power source unit architecture, combining the power supply function and power reduction function in one integrated unit, which avoids increasing device size while achieving improved power amplifier efficiency through dynamic voltage adjustment
Data Source
AI summary
A wireless communication device configured to prevent a transmission time period for sending a wireless signal and a receiving time period for receiving a wireless signal from being overlap, comprises: a transmitter that includes an orthogonal modulator that orthogonally modulates an IQ-modulated modulation signal and a transmission power amplifier that power-amplifies the orthogonally modulated signal; a receiver that includes a demodulator that demodulates a received signal; a first power source that is the power source for the transmission power amplifier and the receiver; and a second power source that is the power source for the orthogonal modulator; and a controller which outputs the modulation signal to the orthogonal modulator. The first power source outputs a constant voltage to the receiver during the receiving time period, and outputs, during the transmission time period, to the transmission power amplifier, a fluctuating voltage according to an envelope of the modulation signal.