TDD Receiver Path Switching for Power Amplifier Noise Compensation
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Solution Overview
Problem
Conventional wireless devices face inefficiencies in implementing digital pre-distortion (DPD) filters to compensate for nonlinear power amplifier noise, requiring specialized hardware and additional computational resources and board space for feedback signal processing.
Innovation Solution
A time division duplexing (TDD) configured radio frame is used to provide both feedback signals and wireless transmission signals through a single receiver path, allowing efficient calculation of coefficients for DPD filters by activating a switch during uplink periods and deactivating it during downlink periods to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiver path is used to process both feedback signals and wireless transmission signals, then computational resource usage and board space are reduced, but the system must carefully manage resource allocation between different signal types
Solution Approach 1:
The patent combines the feedback signal processing path and the wireless transmission signal receiving path into a single receiver path. This merging reduces device complexity by eliminating redundant hardware components while maintaining the ability to process both types of signals through time-division multiplexing and selective activation of processing modules.
Solution Approach 2:
The system dynamically configures the single receiver path to handle different signal types at different times. During uplink periods, the receiver path processes feedback signals for DPD coefficient calculation, while during downlink periods, it receives wireless transmission signals. This dynamic switching allows the system to adapt its functionality based on operational requirements.
2Measurement precision
If DPD filters are implemented with specialized hardware, then compensation accuracy for nonlinear power amplifier noise is improved, but computational resource usage and board space increase
Solution Approach 1:
The patent implements a universal receiver path that can perform multiple functions: processing feedback signals for DPD coefficient calculation, receiving wireless transmission signals, and providing signals for noise compensation. This multi-functional design eliminates the need for specialized hardware while maintaining compensation accuracy through software-based signal processing and selective activation of processing modules.
Data Source
AI summary
Examples described herein include methods, devices, and systems which may compensate input data for non-linear power amplifier noise to generate compensated input data. In compensating the noise, during an uplink transmission time interval (TTI), a switch path is activated to provide amplified input data to a receiver stage including a coefficient calculator. The coefficient calculator may calculate an error representative of the noise based partly on the input signal to be transmitted and a feedback signal to generate coefficient data associated with the power amplifier noise. The feedback signal is provided, after processing through the receiver, to a coefficient calculator. During an uplink TTI, the amplified input data may also be transmitted as the RF wireless transmission via an RF antenna. During a downlink TTI, the switch path may be deactivated and the receiver stage may receive an additional RF wireless transmission to be processed in the receiver stage.