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2017 International Symposium on Wireless Communication Systems (ISWCS), 2017, p.199-204
2017

Details

Autor(en) / Beteiligte
Titel
Hierarchical beamforming for downlink fog RAN
Ist Teil von
  • 2017 International Symposium on Wireless Communication Systems (ISWCS), 2017, p.199-204
Ort / Verlag
IEEE
Erscheinungsjahr
2017
Link zum Volltext
Quelle
IEEE Electronic Library (IEL)
Beschreibungen/Notizen
  • A scenario consisting of several cells is considered where each cell contains a multiple-antenna enhanced remote radio head (eRRH) and several single-antenna mobile stations (MSs). All eRRHs can access the cloud with limited capacity fronthaul links. The beamforming problem aiming at maximizing the sum rate with per eRRH power constraint is considered. In this paper, a hierarchical one-shot top-down approach that decomposes the beamforming problem between the cloud and eRRHs is proposed. The basic idea of our approach is that each eRRH leaves out part of its transmit signal space for minimizing the inter-cell interference to other cells while exploiting the rest of the signal space termed transmission subspace for data transmission. This idea is elaborated in a hierarchical order. First, the cloud, using only the knowledge of link qualities among eRRHs and MSs averaged over all antennas, finds the size of the transmission subspace at every eRRH. Using this information, each eRRH finds the basis of its transmission subspace and correspondingly optimizes its beamforming vectors employing only local channel knowledge. The results show that feeding back only link qualities to the cloud, a significant performance gain can be achieved compared to uncoordinated eRRH based approaches. Furthermore, our proposed approach achieves sum rates close to the global maximum at all signal to noise ratios.
Sprache
Englisch
Identifikatoren
eISSN: 2154-0225
DOI: 10.1109/ISWCS.2017.8108110
Titel-ID: cdi_ieee_primary_8108110

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