Asymmetrical Transceiver Bandwidth Adaptation
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Solution Overview
Problem
The stringent FCC spectral mask requirements for TV white space spectrum usage limit the nonlinearity of power amplifiers in mobile devices, leading to low power efficiency and rapid battery drainage due to the need for significant power back-off to prevent interference with adjacent channels.
Innovation Solution
An asymmetrical wireless transceiver with a bandwidth-determination mechanism that allows mobile devices to transmit at a lower bandwidth than receive, utilizing a tunable modulator and dual-bandwidth receiver to adapt transmission and receiving bandwidths based on power budget and channel availability, thereby relaxing linearity requirements and improving power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power amplifier operates at high power to meet transmission requirements, then the transmission power is sufficient, but the interference to adjacent channels increases and battery drainage accelerates
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the transceiver adapts its transmission bandwidth based on detected channel conditions and interference levels. The system transitions from fixed bandwidth operation to dynamic bandwidth allocation, allowing the transmission parameters to change in real-time according to the radio environment, thereby optimizing power efficiency while maintaining compliance with spectral mask requirements.
Solution Approach 2:
The patent changes the transmission bandwidth parameter adaptively rather than operating at a fixed bandwidth. By adjusting the bandwidth parameter based on channel availability and interference conditions, the system can reduce transmission bandwidth when full bandwidth is not needed, thereby reducing power consumption and minimizing interference to adjacent channels while maintaining adequate transmission power when necessary.
2Use of energy by moving object
If the transmission bandwidth is reduced to improve power efficiency, then battery life is extended, but the data transmission capacity decreases
Solution Approach 1:
The system dynamically adjusts transmission bandwidth based on real-time channel conditions, traffic requirements, and power state. When power efficiency is prioritized (e.g., battery-powered mobile devices), the system operates at reduced bandwidth. When data throughput is prioritized (e.g., wired-backhaul access points with power availability), the system utilizes full bandwidth, thereby optimizing the trade-off between power efficiency and transmission capacity according to operational context.
Solution Approach 2:
The patent applies partial bandwidth utilization when full bandwidth is not required for meeting communication requirements. By transmitting at reduced bandwidth (partial action) rather than always using maximum bandwidth (excessive action), the system achieves adequate data transmission with improved power efficiency, and only escalates to full bandwidth when necessary to meet performance requirements.
3Object-generated harmful factors
If the power amplifier is designed with high linearity to meet spectral mask requirements, then interference to adjacent channels is reduced, but the power efficiency deteriorates
Solution Approach 1:
Instead of relying solely on high linearity power amplifier design, the patent implements dynamic bandwidth adjustment that works in conjunction with the power amplifier. By adaptively reducing transmission bandwidth when appropriate, the system relaxes the linearity requirements on the power amplifier, allowing the use of more power-efficient amplifier designs while still meeting spectral mask requirements through the combination of bandwidth adaptation and controlled transmission parameters.
Data Source
AI summary
One embodiment of the present invention provides a transceiver for a wireless mobile device. The transceiver includes a transmitter, a receiver, and a bandwidth-determination mechanism configured to determine a transmission bandwidth for the transmitter and a receiving bandwidth for the receiver.