10-Gbaud OOK / PAM4 Digital Mobile Fronthaul based on One-Bit / Two-bit Delta-Sigma Modulation Supporting Carrier Aggregation of 32 LTE-A Signals

10-Gbaud OOK/PAM4 digital mobile fronthaul was experimentally demonstrated by using onebit/ two-bit delta-sigma modulation supporting 32 LTE-A carrier aggregation for 3GPP release 13 with up to 256 and 1024QAM. Compared with CPRI, the mobile fronthaul capacity is increased by 4 times.