Research Article
Compressed Transport of Baseband Signals in Cloud Radio Access Networks
@INPROCEEDINGS{10.4108/icst.chinacom.2014.256368, author={ding pengren and Can Zhao}, title={Compressed Transport of Baseband Signals in Cloud Radio Access Networks}, proceedings={9th International Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2015}, month={1}, keywords={c-ran cpri interface baseband signals compression algorithm evm}, doi={10.4108/icst.chinacom.2014.256368} }- ding pengren
Can Zhao
Year: 2015
Compressed Transport of Baseband Signals in Cloud Radio Access Networks
CHINACOM
IEEE
DOI: 10.4108/icst.chinacom.2014.256368
Abstract
Cloud radio access network (C-RAN) is a next generation wireless access network architecture. In this architecture, common public radio interface (CPRI) links are widely used to transmit baseband signals. Currently, one of the great technical challenges for the C-RAN architecture is the soaring CPRI bandwidth required for data transmission between remote radio unit (RRU) and baseband unit (BBU). In this paper, we propose a novel compression method that exploits the temporal and spectral features of baseband signals, which can achieve high compression ratio (3.56x) and low latency (3.4usec) with limited impact on end-to-end communication performance (error vector magnitude <1.89%). We use a combination of reducing signal sampling, digital automatic gain control, Lloyd-Max quantization and cyclic prefix replacement to compress LTE uplink and downlink signals. Upon verifying the feasibility and validity of the algorithm, we implement the design with field programmable gate array (FPGA) resources.