# Path Loss Measurements and Model Analysis in an Indoor Corridor Environment at 28 GHz and 38 GHz
## 1 Introduction  
High data rate wireless communications are essential, and a number of solutions have been presented to address this issue. The requirements for greater capacity, high dependability, data rates, and quality for a number of applications have been met by a variety of current wireless communication systems, notwithstanding this. The most solid answer to this issue is millimeter wave propagation. It is referred to as centimeter wave (cmwave) or millimeter wave (mmWave) spectra. Fifth-generation (5G) technology has drawn interest since it can provide data rates of many gigabits per second (Gbps) [1, 2]. The lower band has been used in many wireless systems, whilst the majority of the upper portion of the spectrum is not used (but may be used) for 5G technology. Potential commercial uses, such as automobile radars and high-data-rate systems, have been made possible due to the rising demand for inexpensive circuitry and better data transfer rates in these bands [3, 4, 5]. Achieving complete transparency and rate convergence between wireless and wired links, millimeter wave (mmWave), and terahertz (THz) bands, which are the new wireless communication technology frontiers, could lead to seamless interconnections between ultra-high speed wired networks (fiber optic links) and personal wireless devices (laptops). Millimeter wave technology operates in the electromagnetic range between 30 and 300 GHz, with wavelengths ranging from 10 to 1 mm [6, 7, 8, 9, 10, 11]. A detailed diagram of themillimeter wave spectrum is shown in Figure 1. The available spectrum at the presented frequencies is more than 200 times larger than all of the present cellular network allocations [7]. This technology is characterized by a large quantity of idle bandwidth that can improve the data rate available to end users, allowing it to meet the two primary requirements for fifth-generation (5G) networks: ultra-high peak throughput (20 Gbps) and the average user experience rate (50-100 Mbps) [9]. Since gigabit Ethernet and desktop connections have become inexpensive for server connections, in 2007, the communication sector disclosed the unoccupied 10 Gb for usage [9; 10]. In addition, gigabit Ethernet became the standard for servers, requiring systems to be ordered with gigabit network interface cards on a regular basis [10]. Over time, the cost of wireless gigabit lines has equaled the cost of wireless. This provides superior output in older wireless applications as well as other feasible uses at gigabit speeds. Wireless communications have become increasingly relevant in the business world, particularly in USB (Universal Serial Bus) 2.0, gigabit speeds, and extended range connectivity, with significant applications in high-quality multi-media, phones, and data services [10]. Previous wireless local area network (WLAN) speeds were just 54 Mb/s, with IEEE 802.11n applications reaching 150-300 Mb/s. However, when it comes to accessing rich media information, even 500 Mb/s is insufficient. In the near future, home A/V (audio/video) networks will need Gb/s data rates to deliver uncompressed high-definition video at resolutions of up to 1920-1080 progressive scans, with latencies ranging from 5 to 15 ms [10; 11]. In addition, the technical requirements for high-speed wireless systems must take into account the following factors:  
Figure 1: Millimeter wave spectrum [12]. The requirement for higher data rates will continue to grow as the demand for multimedia networks grows. The demand for shared resources has increased as a result of data streaming for both personal and mobile devices. Although numerous technologies have been used, such as IEEE 802.11n, IEEE 802.16 (WiMax), and ultra-wideband (UWB), their efficiencies have not been sufficient to meet the demands placed on wireless communications, particularly in fifth-generation (5G) networks [11]. A better way to tackle these challenges is to make proper use of frequencies that are not employed in millimeter waves but have application potential. These frequencies are shown in Figure 1[12].