Wideband Communications Pre-Distortion With Pre-Equalized Frequency Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current signal processing methods in wireless wideband communications devices introduce frequency response distortion while attempting to improve linearity, necessitating a solution that compensates for this distortion without introducing additional side effects.
Innovation Solution
A communications device and method utilizing a pre-distortion circuit and pre-equalizer circuit to calibrate and compensate for frequency response distortion, including a DPD circuit and DPD pre-equalizer circuit to process transmission signals, thereby reducing distortion without significant additional costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal processing methods are used to improve linearity in wireless wideband communications devices, then linearity is improved, but frequency response distortion is introduced
Solution Approach 1:
The patent applies preliminary anti-action by introducing a pre-equalizer circuit that pre-compensates for frequency response distortion before the signal undergoes pre-processing. The pre-equalizer applies inverse frequency response characteristics to counteract the distortion that will be introduced by subsequent pre-processing operations, thereby maintaining both linearity improvement and frequency response fidelity
Solution Approach 2:
The patent implements preliminary action by performing frequency response compensation through the pre-equalizer circuit before the signal enters the pre-processing stage. The pre-equalizer is calibrated using test signals to establish compensation parameters in advance, so that when actual communication signals are processed, the frequency response distortion is already compensated, allowing the pre-processing to improve linearity without introducing harmful distortion
2Reliability
If pre-processing is applied to improve linearity, then linearity improves, but frequency response of the communications device becomes distorted
Solution Approach 1:
The pre-equalizer circuit applies preliminary anti-action by pre-compensating for frequency response distortion with inverse characteristics before pre-processing occurs. This counter-balances the distortion introduced by pre-processing, maintaining both improved linearity and accurate frequency response
Solution Approach 2:
The patent employs feedback by using test signals to calibrate the pre-equalizer circuit. The calibration process measures the actual frequency response of the communications device and uses this feedback information to adjust the pre-equalizer's compensation parameters, ensuring accurate frequency response compensation while maintaining linearity improvement
Data Source
AI summary
A communications device and a method for compensating frequency response distortion of the communications device are provided. The communications device includes a transmitting path circuitry, a receiving path circuitry, a pre-distortion circuit and a pre-equalizer circuit. The transmitting path circuitry generates an output test signal according to a pre-distortion test signal, and the receiving path circuitry generates a first feedback signal according to the output test signal, where the pre-distortion circuit is calibrated according to the first feedback signal. After calibration of the pre-distortion circuit is finished, the pre-distortion circuit generates a second feedback signal according to a single tone signal, where the pre-equalizer circuit is calibrated according to the second feedback signal. After calibration of the pre-equalizer circuit is finished, a transmission signal is processed by the pre-equalizer circuit and the pre-distortion circuit first and then output via the transmitting path circuitry to outside the communications device.