Gbps User Rates Using mmWave Relayed Backhaul With High-Gain Antennas

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 hund...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2017-06, Vol.35 (6), p.1363-1372
Main Authors: Jinfeng Du, Onaran, Efe, Chizhik, Dmitry, Venkatesan, Sivarama, Valenzuela, Reinaldo A.
Format: Article
Language:English
Subjects:
angular spread
Antenna arrays
Antennas
backhaul
Bandwidth
Bandwidths
Base stations
Beamforming
Chains
Channel estimation
Core wire
Design analysis
Design optimization
Economics
Joints
Measuring instruments
Medicare
Meters
Millimeter wave
Polarization
relay
Relays
Topology
wireless access
Wireless access points
Wireless communication
Wireless communication systems
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Summary: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.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2017.2686578