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In this paper, we present the channel measurement results of vehicle-to-vehicle (V2V) measurement campaign carried out in Oulu city center, Finland. The measurements were conducted with EB Propsound CSTM at 2.3 GHz and 5.25 GHz center frequencies. The antennas were installed on the roof of the vehicles and the measurements were performed for single-input multiple-output (SIMO) antenna configuration...
The possibility of using the channel reciprocity between the uplink and downlink channels in Frequency Division Duplex (FDD) systems to improve the efficiency has been deeply investigated. Previous studies have come to different conclusions for the characterization of the dissimilarity in uplink and downlink channel properties. This paper analyzes the mismatch in directional properties of the uplink...
In this paper, we present an indoor channel measurement system at 28 GHz and analysis result of propagation characteristics. The measurement system consists of a vector network analyzer (VNA) and a pair of 26 dBi horn antennas. It makes reliable wireless links with a maximum distance up to 30 meters. Measurement campaign was conducted in Beijing with three different indoor scenarios including office,...
This paper presents reflection coefficient measurements in order to analyze the scattering effect of rough walls and floor on mm-Wave propagation at 60 GHz in an underground mine. A 60 GHz frequency domain measurement system with directional antennas is considered. Reflection coefficients are obtained by individual reflected signals and line of sight (LOS) signals with a particular reflective angle...
This paper presents newly generated omnidirectional close-in free space reference distance and floating intercept path loss models obtained from 28 GHz and 73 GHz RF ultrawideband propagation measurements collected in Downtown Manhattan using a 400 Mega-chip-per-second sliding correlator channel sounder. Simplified path loss models with respect to a 1 m close-in free space reference distance are provided...
A key issue impacting the transmit to receive (TX-RX) isolation in Electrical Balance (EB) Duplexers is dynamic matching of the antenna impedance by the balancing network. Circuit simulations including embedded antenna measurements have been used to investigate the variation in TX-RX isolation due to interaction with the user and the local environment. Simulated results at 847MHz and 1960MHz show...
A wideband antenna suitable for body area networks is presented. The antenna ensemble consists of a wideband dipole, a spacer element and a back patch. The back patch helps direct the energy efficiently into the forward hemisphere. The low profile antenna displays a VSWR < 2:1 over 3–10 GHz. The front-to-back ratio is greater than 3 dB over this frequency range. Both theoretical and experimental...
Leaky coaxial cables (LCX) have been widely used as antennas to form linear service areas for radio communication systems. Such services of linear cells have been deployed inside tunnels, along railways, and so on. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. In this paper, we propose a MIMO system using...
A better understanding of the spatial structure of existing opportunistic wireless network deployments will offer new insights for future deployments, e.g. dense femtocell networks. In this paper we present a performance analysis for three different localization algorithms that support such efforts by finding the location of IEEE 802.11 Wi-Fi access points (APs) from distributed signal strength measurements...
Automatic detection of cells which are in outage has been identified as one of the key use cases for Self Organizing Networks (SON) for emerging and future generations of cellular systems. A special case of cell outage, referred to as Sleeping Cell (SC) remains particularly challenging to detect in state of the art SON because in this case cell goes into outage or may perform poorly without triggering...
Near ground localization is a special type of localization scenario that is widely considered in both academic and industry. A proper way to describe time-of-arrival (TOA) ranging error for near ground localization applications has been in a strong demand since early 2010s. In this paper, we proposed a mathematical model for near ground TOA ranging error based on empirical measurement. According to...
Body area network (BAN) technology can enable the real-time collection and monitoring of physiological signals for personalized healthcare. Implantable biomedical sensors transmitting continuously clinical information to an external unit can facilitate the involvement of the patients in the management of chronic diseases. In addition, ingestible sensors like the wireless capsule endoscope (WCE) have...
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