TDD Power Amplifier Linearization Using Shared Receiver Feedback
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Solution Overview
Problem
Adaptive power amplifier linearization in time division duplex communication systems faces challenges due to the need for a dedicated receiving subsystem to monitor the power amplifier output, which adds complexity and cost, and is idle during transmitter activity, making it inefficient in TDD systems where transmission and reception are mutually exclusive.
Innovation Solution
A transceiver design that utilizes dual-purpose switches to route the amplified transmit RF signal to the receiving subsystem circuitry for feedback during transmission and switches to receive RF signals during reception, eliminating the need for a separate dedicated receiving subsystem and enabling adaptive power amplifier linearization without idle cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated receiving subsystem is used to monitor the power amplifier output for adaptive linearization, then the linearization accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The receiving subsystem is designed to perform dual functions: monitoring the power amplifier output during transmission for adaptive linearization and receiving actual RF signals during reception. This eliminates the need for a separate dedicated monitoring subsystem, reducing device complexity and cost while maintaining linearization accuracy through feedback from the same receiving subsystem.
2Measurement precision
If a dedicated receiving subsystem is used for adaptive power amplifier linearization, then the linearization performance is improved, but the loss of time increases due to idle cycles in TDD systems
Solution Approach 1:
The receiving subsystem operates continuously without idle cycles by switching between two useful functions: monitoring the power amplifier output during transmission intervals and receiving RF signals during reception intervals. This eliminates wasted idle time while maintaining continuous linearization performance through adaptive feedback in transmission mode.
3Productivity
If the receiving subsystem is used for both transmission monitoring and signal reception, then the productivity is improved by eliminating idle cycles, but the measurement precision may be affected by signal switching
Solution Approach 1:
The system dynamically switches the receiving subsystem between monitoring and reception modes using switches controlled by a controller based on transmission/reception timing. This dynamic switching allows the subsystem to perform both functions without compromising measurement precision, as the switching occurs during natural TDD transitions when signal characteristics are well-defined.
Data Source
AI summary
In an aspect of the invention, a method is performed in a transceiver for adaptive power amplifier linearization in time division duplex communication systems. The method comprises, in response to a first condition, performing, using a feedback signal generated by receiving subsystem circuitry, adaptive power amplifier linearization on a signal to be transmitted. The method additionally comprises, in response to a second condition, performing operations in order to determine receive data from a received radio frequency (RF) signal. The operations use at least the receiving subsystem circuitry. In a further aspect of the present invention, a transceiver is disclosed.