Equalization Enhancement Approaches for PAM4 Signaling for Next Generation Speeds
Equalization Enhancement Approaches for PAM4 Signaling for Next Generation Speeds
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用于下一代速度的 PAM4 信令的均衡增强方法
DOI：
10.1109/ectc.2017.178
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
B. Mutnury
中科院分区：
文献类型：
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作者：
J. He;N. Dikhaminjia;M. Tsiklauri;J. Drewniak;A. Chada;B. Mutnury
四电平脉冲幅度调制信号（PAM 4）作为二进制调制NRZ（Non Return to Zero）的替代编码方案，随着信号速率的减半，在高速系统中得到越来越多的关注。发射机和接收机均衡继续在PAM 4编码中发挥重要作用。尽管去加重是NRZ中均衡的标准化方法，但本文提出了两种用于PAM 4去加重的增强方法。第一种增强方法是在去加重过程中补偿电压电平，第二种是按比特而不是按符号均衡信号。几个测试案例显示，与旧的方法相比，眼睛开放的改善。这两种增强方法的局限性也进行了讨论。
Four-level pulse-amplitude modulation signal (PAM4) is gaining more attention as an alternate coding scheme to binary modulation NRZ (Non Return to Zero) in high speed systems as the signal rate is reduced by half. Transmitter and receiver equalizations continue to play an important role with PAM4 encoding. Even though de-emphasis is a well standardized approach for equalization in NRZ, two enhancement approaches for PAM4 de-emphasis are proposed in the paper. The first enhancement approach is to compensate voltage levels in the de-emphasis process and the second one is to equalize the signal by bit rather than by symbol. Several test cases are presented to show the improvement in eye opening compared to the old approach. The limitations of these two enhancement approaches are also discussed.