Abstract
High throughput and ultra low latency are the main requirements for fifth generation (5G) mobile broadband communications. Densely populated urban environments require utilization of previously underutilized millimeter wave frequency spectrum for higher data rates. The Ka-band, previously used in satellite applications, is of particular interest to terrestrial 5G mobile networks. New radio solutions are required for these frequencies, such as multiple wireless base stations organized in small cells and highly directional antennas to compensate for higher path loss. Wireless backhaul is predicted to be the most cost-effective and versatile solution to connect 5G base stations to the core network. Wireless backhaul enables flexible and easy installation of 5G base stations in ad hoc networks, supporting large crowd gatherings such as concerts and sports events. In this article, we present an architecture of a wireless backhaul transceiver, which operates on the 26.5–29.5-GHz band. The architecture described in this paper was implemented, and the performance of the receiver (Rx) array has been measured. We also present over-the-air antenna array measurement results using the Rx. The measurement results show that unequal Rx channel gains and antenna gains do not have a significant effect on the shape of the main lobe of the radiation pattern. We have measured a coherence gain of 2.7 dB from two Rx channels that is close to the theoretical value of 3.0 dB. We have achieved a conducted Rx EVM of better than 2% using a 100-MHz 16-QAM modulated signal at 26.5 GHz.
Highlights
1 Introduction One of the technology drivers of the fifth generation (5G) mobile networks is the communication at the millimeter wave frequency bands such as the Ka- and the E-band
The frequency spectrum between 26.5 and 29.5 GHz is proposed to be used for Winter Olympics in South Korea, of which 27.5–28.5 GHz is allocated for proof-of-concept 5G demonstrations [1]
The Multiple input multiple output (MIMO)-orthogonal frequency-division multiplexing (OFDM) solution follows a classical implementation of a Long-Term Evolution (LTE) modem including scrambling, quadrature modulation, layer mapping, MIMO precoding, frequency resource mapping, and OFDM signal generation
Summary
One of the technology drivers of the fifth generation (5G) mobile networks is the communication at the millimeter wave (mmW) frequency bands such as the Ka- and the E-band. Some prototype designs operating at or close to the aforementioned frequency band have been recently presented in the literature [2–7]. With the exception of [7] are integrated circuit solutions that do not reach the output power levels required for long-range wireless backhaul. We have presented system-level calculations and link budget analysis for a backhauling proof-of-concept radio unit aiming at a > 2 Gbps data rate and a range of 200 m. Kursu et al EURASIP Journal on Wireless Communications and Networking (2018) 2018:201 in [9], designed for the 5GChampion trial in conjunction with the 2018 Winter Olympics
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