National University of Singapore
The performance of Cloud Radio Access Network (C-RAN) is constrained by the limited fronthaul link capacity under future heavy data traffic. To tackle this problem, extensive efforts have been devoted to design efficient signal quantization/compression techniques in the fronthaul to maximize the network throughput. However, most of the previous results are based on information-theoretical quantization methods, which are hard to implement due to the extremely high complexity. In this paper, the authors consider using practical uniform scalar quantization in the uplink communication of an Orthogonal Frequency Division Multiple Access (OFDMA) based C-RAN system, where the mobile users are assigned with orthogonal sub-carriers for multiple access.