Latency-efficient code-division multiplexing (CDM) based carrier aggregation for 5G NR mobile fronthaul

We propose and experimentally verify a latency-efficient code-division multiplexing (CDM) based carrier aggregation (CA) scheme with simultaneous mitigation of peak-to-average power ratio (PAPR), for the scenario of 5G new radio (NR) mobile fronthaul (MFH). We utilize the least squares approximation (LSA) algorithm to reduce 36% number of iterations for achieving the same PAPR mitigation, in comparison with the traditional CDM based CA scheme. Finally, we experimentally demonstrate the proof-of-concept transmission of 16×100 MHz 5G NR signals mapped with 64 quadrature amplitude modulation (QAM) having the common public radio interface (CPRI) equivalent date rate of 78.6 Gb/s, based on the use of a directly modulated laser (DML). After 10 km standard single mode fiber (SSMF) transmission, we can secure both the latency reduction of CA processing and the PAPR mitigation with almost no penalty of receiver sensitivity.