Open AccessPin‐efficient 9‐bit 8‐wire 4‐level synergetic‐equalisation coding scheme for 216 Gb/s PAM4 transceiver
Author(s) -
Shi Linqi,
Gai Weixin,
He Yandong
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.3976
Subject(s) - transceiver , computer science , bit error rate , decoding methods , equaliser , channel (broadcasting) , electronic engineering , coding (social sciences) , transmitter , pulse amplitude modulation , telecommunications , mathematics , wireless , engineering , pulse (music) , detector , statistics
A synergetic‐equalisation coding scheme for pulse‐amplitude modulation 4‐level (PAM4) is proposed, based on which a 216 Gb/s 9‐bit 8‐wire 4‐level (9B8W4L) transceiver is designed. According to the scheme, eight channels are grouped into four pairs based on the states for encoding. The two channels in pair transmit the same symbol in this unit interval (UI), and transmit different symbols in different pairs in the next UI. When decoding, the symbols in different channels are subtracted from and added with the others, following the grouping in the prior UI. From this, the first post‐cursor inter‐symbol interference is eliminated. Based on the proposed coding scheme, the PAM4 transceiver transmits 9‐bit data by eight channels, giving a channel utilisation of 112.5%. The improvement of channel utilisation reduces the Nyquist frequency for the same data rate, which is of great significance for reducing channel loss and power consumption. The 216 Gb/s 9B8W4L transceiver with 1‐tap feed‐forward equaliser achieves a bit error rate <10 −12 through −20 dB channel loss at the Nyquist frequency of 12 GHz.