2017/03/27 by Jinfeng Du, Efe Onaran, Dmitry Chizhik +2 · 2 citations
Computer Science · Engineering · Mathematics · #Advanced MIMO Systems Optimization #Antenna (radio) #Antenna array #Array gain #Backhaul (telecommunications) #Bandwidth (computing) #Base station #Beamforming #Computer network #Computer science #Directional antenna #Electrical engineering #Electronic engineering #Engineering #Extremely high frequency #Microwave Engineering and Waveguides #Millimeter-Wave Propagation and Modeling #Path loss #Telecommunications #Topology (electrical circuits) #Wireless #cs.IT #math.IT
paper · pdf · doi:10.1109/jsac.2017.2686578
published as IEEE Journal on Selected Areas in Communications (JSAC, Special Issue on Deployment and Performance Challenges for 5G), vol. 35, pp. 1363--1372, Jun. 2017 · Fixed a typo in the caption of Figure 2 ("5 dBi" should be "8 dBi")
openalex publication_date 2017/03/27 · arxiv created 2018/05/07 · arxiv updated 2018/05/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Delivering Gbps high user rate over long distances (~1 km) is challenging, and the abundant spectrum available in millimeter wave band cannot solve the challenge by its own due to the severe path loss and other limitations. Since it is economically challenging to deploy wired backhaul every few hundred meters, relays (e.g., wireless access points) have been proposed to extend the coverage of a base station, which has wired connection to the core network. These relays, deployed every few hundred meters, serve the users in their vicinity and are backhauled to the base station through wireless connections. In this paper, the wireless-relayed backhaul design has been formulated as a topology-bandwidth-power joint optimization problem, and the influence of path loss, angular spread, array size, and RF power limitation on the user rate has been evaluated. It has been shown that for a linear network deployed along the street at 28 GHz, when high joint directional gain (50 dBi) is available, 1 Gb/s user rate within cell range of 1 km can be delivered using 1.5 GHz of bandwidth (using single polarization antennas). The user rates drop precipitously when joint directional gain is reduced, or when the path loss is much more severe. When the number of RF chains is limited, the benefit of larger arrays will eventually be surpassed by the increased channel estimation penalty as the effective beamforming gain saturates owing to the channel angular spread.