A Broadband Analog Group Delay Equalizer

Abstract

The invention discloses a broadband analog group time delay equalizer, which belongs to the technical field of wireless communication and relates to channel equalization technology, microwave communication technology and filter time delay technology. Based on the T-shaped all-pass network topology of a lumped parameter two-port bridge, a non-centrosymmetric parabolic equalization method is proposed, and a multi-level cascaded high-order equalization technology with frequency point dislocation is adopted, and an attenuation network is added between each level to prevent frequency jitter And the frequency pulling phenomenon, to achieve good isolation and matching between each single-stage equalizer, and finally to achieve uniformity and equal ripple at the top of the equalizer, ensuring the flatness of the overall equalization effect. The basic idea is: (1) Design a single-stage equalizer with multiple frequency points misplaced, and the equalization frequency point and equalization amount of each equalizer are different, so as to realize asymmetrical equalization. (2) Add PI type attenuation network between all levels. (3) Micro-adjust the equalizers at all levels to ensure the flatness and consistency of the delay equalization curve of the high-order equalizer. Finally, a group delay equalizer with a new broadband structure is realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to channel equalization technology, microwave communication technology and filter delay technology. Background technique [0002] The circuit that corrects the intersymbol interference of the channel is called an equalizer (Equalizer, EQ), and its essence is an inverse filter of the channel. In high-speed digital mobile communication, digital microwave wireless communication system and short-wave communication system as one of the important long-distance communication and military communication means, the system performance deteriorates due to intersymbol interference caused by multipath and fading phenomena. Appropriate and effective equalization technology can overcome many shortcomings of data transmission in frequency band utilization, bit error rate performance and transmission rate, thereby effectively reducing intersymbol interference (Inter Symbol Interface, ISI...

AI Technical Summary

Problems solved by technology

In the field of microwave communication, there are still some difficulties and challenges to achieve a wideband analog delay equalizer, but the actual demand is very urgent

For example, filters are used very frequently, considering that for broadband filters, the group delay characteristic curve is an unsatisfactory concave curve, the bottom is very gentle, the delay curve is very steep at the corner frequency points at both ends, and the peaks at both ends Inconsistent, there are large delay fluctuations

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