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Equalizer

A technology of equalizer and adder, which is applied in the electronic field, can solve the problems such as intersymbol interference cannot be eliminated, and achieve the effect of reducing symbol correlation jitter and bit error rate

Inactive Publication Date: 2018-04-03
HUAWEI TECH CO LTD
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Problems solved by technology

[0004] However, the forward equalizer of PAM-4 provided in the prior art cannot eliminate inherent intersymbol interference

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Embodiment Construction

[0050] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented.

[0051] PAM-4 is a typical amplitude modulation technology, however, PAM-4 has inherent intersymbol interference. specifically, figure 1 It is a schematic diagram of the level conversion of two-level signals and four-level signals, figure 1 (1) conversion of two-level non-return zero code (Non-Return Zero, NRZ for short), figure 1 (2) It is a four-level PAM-4 level conversion. Whether it is for NRZ or PAM-4, there are crossover points when level shifting. For NRZ, it is only a conversion between two levels, therefore, there is only one cross point, such as figure 1 As shown in...

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Abstract

The invention provides an equalizer, and the equalizer comprises an odd-line processing circuit and an even-line processing circuit. The odd-line processing circuit comprises N processing circuits anda first adder, and the even-line processing circuit comprises N processing circuits and a second adder. Moreover, each processing unit comprises one D flip-flop and a one conversion circuit. In the i-th processing circuit, the first input end of the conversion circuit is connected with the input end of the D flip-flop, and the second input end of the conversion circuit is connected with the output end of the D flip-flop. The output end of the D flip-flop in the i-th processing circuit is connected with the input end of the D flip-flop in the (i+1) processing circuit. According to the invention, the odd-line processing circuit and the even-line processing circuit of the equalizer are respectively provided with the conversion circuits, so as to achieve the edge conversion processing of multi-level signals, thereby reducing the bit error rate of the equalizer.

Description

technical field [0001] The invention relates to electronic technology, in particular to an equalizer. Background technique [0002] During the transmission of high-speed signals, there may be problems such as signal attenuation, signal reflection, inter-symbol interference, and crosstalk, which affect the transmission quality of the signal. As a solution, amplitude modulation technology is used in high-speed serial transceivers to improve signal spectrum utilization, that is, to transmit multiple bits with one symbol, which can reduce the burden of equalization design during high-speed signal transmission, reduce channel requirements, and improve Clock frequency. Among them, a four-level pulse-amplitude modulation technique (Four-level Pulse-Amplitude Modulation, PAM-4 for short) is a typical amplitude modulation technique. The forward equalizer of the PAM-4 can be realized by using a finite-length unit impulse response (Finite Impulse Response, FIR for short) filter and a...

Claims

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L25/03006H04L25/03
Inventor 邬可俊杨伟肖世海
Owner HUAWEI TECH CO LTD
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