In this paper, 3+2nd-order sturdy multistage noise-shaping delta-sigma modulation with noise-coupling (SMASH-NC) structure is proposed for digital mobile fronthaul (MFH) architecture. The computational complexity of the 3+2nd-order SMASH-NC is approached to that of the traditional fourth-order single-loop delta-sigma modulation (SDSM), but with the sixth-order noise shaping capability. The MFH architectures based on 3+2nd-order SMASH-NC and fourth-order SDSM are simulated and compared. 10-Gbaud PAM-4 signal is transmitted through the 20-km IM-DD link. With an SNR of 54.3 dB, the SMASH-NC scheme can support 65536-QAM transmission. Compared to traditional SDSM, SMASH-NC scheme balances performance and computational complexity, providing a cost-competitive solution for MFH with ultra-high-order QAM.
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