The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The millimeter wave bands will be used for 5G or IoT to overcome frequency insufficiency. This paper shows relations of received power, multipath delay spread and distance in urban low-rise environments at both 28 and 38 GHz. The wideband characteristics had been measured with a channel sounder, a directional antenna for transmitter, and an omni-directional antenna for receiver in Daejeon area.
This paper represents the characteristics of RMS delay spread according to distance between a transmitter and receiver with measurement results about 28 and 38 GHz at urban low-rise environments, line-of-sight(LOS) conditions. The measurement site, urban low-rise is defined at ITU-R Rec. P.1411-8. When we measured the delay spread, we used a wideband channel sounder and omnidirectional antenna for...
Delay spread characteristics in the 28GHz band were measured at line of sight urban environments using narrow beamwidth antennas and simulated using ray-tracing with the same conditions. The channel sounder has 500MHz wide bandwidth at 28GHz, and using swept time delayed cross-correlation technique. The measurement environment is urban low-rise areas. The measurement and simulation results are compared...
Wideband characteristics in the 28GHz band were measured at various environments using narrow beamwidth antennas. In this paper, we present delay spreads of urban low-rise area with two line of sight cases, one is a face-to-face and the other is non-face-to-face between antennas. Also, we present a distance characteristic of delay spread based on measured data.
In this paper, we analyzed the reflection and scattering characteristics based on the surface roughness of mediums at 60GHz, and studies a method for application to propagation prediction using a theoretical generalization of these characteristics. Due to short wavelength within a few millimeters of 60GHz band, the scattering characteristic is occurred by the small roughness of the surface of a wall...
In the next generation of mobile communication systems, high data rates and high capacity will be possible if multiple antennas are used at new frequencies. This paper presents the correlations between channel parameter path loss (PL), root mean square delay spread (DS), angular spread (AS), and K-factor established based on channel measurements. The channel measurements were performed in a 781MHz...
This paper presents the measured and analyzed radio channel characteristics found in macro-cellular outdoor environments for the 700 MHz band. The path characteristics at 700MHz seem to be similar to those found at 900MHz, but can't be truly predicted without research. The path loss characteristics for each area have been exhaustively researched and compared to the WINNER+ model; simplified path loss...
This paper presents the measured radio propagation characteristics in outdoor environments for new mobile wireless system in the Jeju island at 781 MHz frequency. The propagation characteristics at 781MHz seem to be similar at 900MHz, but detailed characteristics can't be predicted without research for wireless communication system at the 781 MHz frequency. Also, there are few studies on process of...
Millimeter-wave band has been using for high-speed line of sight transmission in short range and there is no problem due to delay spread. But if it is used in indoor to connect an access point(AP) to terminals of WLAN, the delay spread made by multipath reflections limits the transmission speed. Typically, antenna beamwidth is the wider, delay spread is the bigger and it is also equally applicable...
Multiple-input multiple-output (MIMO) systems at the UHF bands is interest for wireless communication applications. When designing and evaluating such systems, knowledge of realistic propagation conditions is required. In this paper, the development of wideband MIMO channel sounder and a pilot measurement result is described for research on the multi antenna radio propagation characteristics considering...
The propagation characteristic of 60 GHz with NLOS case was measured in an empty office room, which was 13 ?? 8.6 ?? 3 m. The NLOS was made by a partition which was in front of a transmitter. The transmitter was located in a corner and the receiving points were 70 and they had 1 m spacing between them. Four antennas, an omni directional antenna, a 45?? beamwidth, a 30?? beamwidth, and a 12?? beamwidth...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.