Abstract
Concerning the design and planning of new radio interfaces for the fifth-generation (5G) systems, this paper presents a useful contribution to the characterization of the wideband indoor radio channel in the 3-4-GHz frequency band. A measurement campaign has been carried out in two different indoor scenarios to analyze some of the most important wideband parameters of the propagation channel, including a thorough analysis of its behavior to meet the new radio technology challenges. The channel measurement setup consists of a virtual vertical uniform array at the receiver side of the link that remains at a fixed position, whereas the transmitter side, which is equipped with a single antenna, is placed at different positions in the environment under analysis. The measurement setup emulates the up-link of a multi-user multiple-input multiple-output (MIMO) system and allows obtaining the broadband parameters of the multiple channels that are established between the transmitter and each one of the antennas of the receiver array. The results and conclusions about the path loss, temporal dispersion, and coherence bandwidth are included, along with an analysis of the spatial correlation between wideband channels when one of the antennas is an array.
Highlights
Since the arrival of the first digital networks to the present day, there has been an unprecedented growth in the demand for mobile services, which is sure to continue and speed up in the decade
The measurement setup consists of a planar scanner along with a E8362A PNA vector network analyzer (VNA), both remote controlled from a computer through RS-232 and general purpose interface bus (GPIB), respectively
Results concerning the temporal dispersion of the channel and its frequency selectivity are included and discussed
Summary
Since the arrival of the first digital networks to the present day, there has been an unprecedented growth in the demand for mobile services, which is sure to continue and speed up in the decade. To provide such services and new applications with the required quality, the requirements for future fifth-generation (5G) systems must achieve [1], [2]: an increase in aggregate data rate, with peak speeds that must multiply by a 1000 factor with regard to 4G networks; low latency, less than 1 ms, compared with 10 ms for 4G; and a high mobility, up to 500 km/h. In Europe the 3.4-3.8 GHz band is already allocated to the deployment of such systems and in USA the 3550-3700 MHz band has been allocated for spectrum sharing [3]
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