Fig. 7: Hardware complexity estimates for different schemes.
From: Coherent optical interconnects using Fermat number transform and hollow core fibre
a Statistics of RMPs and RADs in the NF and AEQ blocks based on different techniques. b The normalized complexity levels of different schemes. c BERs versus ROPs for an NANF implemented via the FNT-DSP scheme and FFT-DSP scheme. RMP real-valued multiplication, RAD real-valued addition, NF Nyquist filtering, AEQ adaptive equalization, CPR carrier phase recovery, FOE frequency offset estimation, Single-C single carrier, DSCM digital subcarrier multiplexing, Single-C Coh. single carrier modulation with coherent structure, RCM Coh. residual carrier modulation with coherent structure, Single-C SDM-SHCD single carrier modulation with the spatial division multiplexing SHCD structure, BER bit error rate, ROP received optical power, FNT Fermat number transform, FFT fast Fourier transform.
