A Study of Discrete Multitone Modulation for Wireline Links Beyond 100 Gb/s

To overcome the severe losses beyond 28 GHz in low-cost electrical channels, 4-level pulse-amplitude modulation (4-PAM) wireline links targeting 112 Gb/s incorporate resourceor power-intensive equalization schemes such as decision-feedback equalizers (DFE) with many taps. Alleviating timing constraints that cause DFEs to balloon size and power, discrete multitone (DMT) involves independent sub-channels can be equalized frequency domain without feedback. DMT allows flexibility assigning bits each sub-channel, thereby potentially avoiding lossy parts of spectrum. This article presents behavioural modeling results an experimental setup used study transceivers. Our simulations show 200 operation at a bit error rate (BER) less than 10 -5 over IEEE P802.3ck channel 21 dB loss 50 assuming 150 fsrms jitter, 1.26 mVrms noise receiver's input, 7-bit 80 GS/s data converters. An updated bit-loading algorithm led BER values 1-2 orders magnitude below our previous results. The estimated power area associated digital signal processing are comparable those DFE. We also present achieving 61.6 8.6 × xmlns:xlink="http://www.w3.org/1999/xlink">-4 physical notches is very challenging for 4-PAM.