Patent ID: 11881971
Assignee: INSPUR SUZHOU INTELLIGENT TECHNOLOGY CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An adaptive 4-level Pulse Amplitude Modulation (PAM4) decision feedback equalization circuit, comprising a decision feedback equalization main circuit and an adaptive circuit,
wherein the decision feedback equalization main circuit comprises an adder, a first decision device, a second decision device, a third decision device, a first delay unit group, a second delay unit group, a third delay unit group, a decoder, and a Digital Signal Processor (DSP) coefficient table;
wherein each one of the first delay unit group, the second delay unit group and the third delay unit group is formed by I delay units connected in series;
an input signal is connected to an input of the adder;
an output of the adder is connected to inputs of the first decision device, the second decision device, and the third decision device, separately;
outputs of the first decision device, the second decision device, and the third decision device are connected to inputs of the first delay unit group, the second delay unit group, and the third delay unit group, respectively;
outputs of the first delay unit group, the second delay unit group, and the third delay unit group are connected to an input of the decoder, separately;
the input of each one of the first delay unit group, the second delay unit group and the third delay unit group is connected to an input of a tap coefficient unit;
outputs of 31 tap coefficient units comprising the tap coefficient unit are connected to an input of the DSP coefficient table;
an output of the DSP coefficient table is connected to the input of the adder;
a composite signal of the input signal with a feedback signal of the DSP coefficient table after passing through the adder is input to the adaptive circuit; and
an output of the adaptive circuit is connected to the DSP coefficient table to adjust tap coefficients in the DSP coefficient table, wherein I is an integer greater than one.