Pre-Equalizer Calibration for Frequency Response Distortion Compensation
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Solution Overview
Problem
Current signal processing methods in wireless wideband communications devices introduce frequency response distortion while attempting to improve linearity, necessitating a novel approach that minimizes or eliminates this distortion without introducing side effects.
Innovation Solution
A communications device and method utilizing a memory pre-distortion circuit and pre-equalizer circuit, coupled at the front-end of the transmitting path, to calibrate pre-distortion coefficients and perform pre-equalization, compensating for frequency response distortion caused by low pass filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal processing methods are utilized to improve linearity in wireless wideband communications device, then linearity is improved, but frequency response distortion is introduced
Solution Approach 1:
The pre-equalizer circuit applies preliminary anti-action by pre-compensating the signal with inverse frequency response characteristics before the signal enters the transmitting path circuitry. This anticipates and counteracts the frequency response distortion that would otherwise be introduced by the low pass filters and other components in the transmitting path, allowing the signal processing methods to improve linearity without causing harmful frequency response distortion.
Solution Approach 2:
The pre-equalizer circuit serves as an intermediary component between the signal source and the transmitting path circuitry. It processes the signal in advance to compensate for frequency response distortion, acting as a mediator that prepares the signal to withstand the subsequent processing without suffering harmful distortion effects.
2Object-generated harmful factors
If pre-equalizer circuit is added to compensate frequency response distortion, then frequency response distortion is compensated, but device complexity increases
Solution Approach 1:
The pre-equalizer circuit is merged with the existing signal processing chain at the front-end of the transmitting path circuitry. By integrating the pre-equalization function into the existing architecture rather than adding completely separate processing stages, the patent compensates for frequency response distortion while minimizing the increase in device complexity.
Solution Approach 2:
The pre-equalizer performs preliminary action on the signal before it enters the main transmitting path. By preparing the signal in advance with pre-computed equalization coefficients, the system avoids the need for more complex real-time processing later in the chain, thereby reducing overall device complexity while still achieving frequency response compensation.
Data Source
AI summary
A communications device and a method for compensating frequency response distortion of the communication device are provided. The communications device includes a transmitting path circuitry, a receiving path circuitry, a memory pre-distortion circuit, a pre-equalizer circuit and a pre-equalization calculation circuit. The transmitting path circuitry and the receiving path circuitry are configured to generate a feedback signal according to a pre-distortion test signal, where a set of pre-distortion coefficients of the memory pre-distortion circuit are calibrated according to the feedback signal. After calibration of the set of pre-distortion coefficients is finished, the pre-equalization calculating circuit performs calculation on the set of pre-distortion coefficients to generate a calculation result for calibrating the pre-equalizer circuit. After calibration of the pre-equalizer circuit is finished, a transmission signal is processed by the pre-equalizer circuit and the memory pre-distortion circuit first, and then output to outside of the communications device via the transmitting path circuitry.