Research Article
Joint Pilot Allocation for Fronthaul and Access Links in Cloud Radio Access Networks
@INPROCEEDINGS{10.4108/eai.13-7-2017.2270277, author={Zhendong Mao and Yuexia He and Ying Li}, title={Joint Pilot Allocation for Fronthaul and Access Links in Cloud Radio Access Networks}, proceedings={1st Workshop on Fog Computing-Based Radio Access Networks for 5G}, publisher={EAI}, proceedings_a={F-RAN 5G}, year={2017}, month={12}, keywords={c-ran channel estimation pilot allocation}, doi={10.4108/eai.13-7-2017.2270277} }- Zhendong Mao
Yuexia He
Ying Li
Year: 2017
Joint Pilot Allocation for Fronthaul and Access Links in Cloud Radio Access Networks
F-RAN 5G
EAI
DOI: 10.4108/eai.13-7-2017.2270277
Abstract
Acquisition of instantaneous channel state information (CSI) is essential in cloud radio access networks (C-RANs) to achieve advanced technologies. However, the overhead to obtain CSIs by traditional schemes is sufficiently large, which will degrade the spectrum efficiency. To handle this problem, a two-phase based pilot allocation scheme is proposed in this paper, where both the wireless fronthaul link and radio access link are considered. In particular, the pilot allocation for RRH is derived based on the angular resolution characteristics in phase I. In phase II, an inter-cluster and intra-cluster pilot allocation algorithm for users is proposed to mitigate the pilot contamination. Numerical results are shown to demonstrate the performance of our proposed pilot allocation scheme in C-RANs.