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Multiple-input multiple-output (MIMO) systems constitute an important part of todays wireless communication standards and these systems are expected to take a fundamental role in both the access and backhaul sides of the emerging wireless cellular networks. Recently, reported measurement campaigns have established that various outdoor radio propagation environments exhibit sparsely structured channel...
Source direction of arrival (DoA) or angle of arrival (AoA) estimation is one of the vital problems in many wireless communication applications such as radar, radio astronomy, sonar and navigation. The resolution of a source direction of arrival estimation can be improved by an uniform linear array (ULA) system with innovative signal processing techniques. Super resolution techniques take the advantage...
During these years, mobile telecommunication system based on LTE has been largely studied and has formed a mature technical system. For special application scenarios and business requirement, a comprehensive and new generation of railway mobile telecommunication system based on LTE is bound to take shape via innovative researches and technology improvements. Under fast- moving scenario of high-speed...
Recently, wireless networking technologies have been evolving to support wider bandwidth, and longer radio range in denser networks. Therefore, there is a high probability that two or more networks will overlap and result in more co-channel interferences. To mitigate the interference, the centralized network system is a promising solution which is based on the conflicts information provided by the...
In urban environments, a multipath propagation and the Doppler effect are dominant phenomena that negatively affect the quality of service in wireless communications and realization of location methods. This paper presents the localization method of emission source in urban terrain for NLOS conditions based on the Doppler effect. To this aim, authors use the signal Doppler frequency (SDF) method....
In frequency division duplex (FDD) two-tier networks, the probing technique has recently been introduced into the cross-channel gain estimation, which requires the tier-two user to act as a relay for the tier-one user. Then the tier-two user can autonomously estimate the cross-channel gain. However, the improper location of the tier-two user, i.e., the relay, may cause severe interference to the tier-one...
The aim of this study is to develop an accurate and reliable method of estimating field distributions in train cars so as to advance radio link design of wireless LANs operated inside the cars. This paper describes effects of absorption and shielding caused by a large number of passengers on propagation characteristics of RF leakage from wireless access point operating in a bullet train. Field distributions...
In the process of wireless communication, channel effects are always a factor of degradation in offered quality. Major channel effects such as noise effects, fading, multipathing, Doppler shift etc., results in degradation in the observed quality of service for the communication system. Various approaches are developed towards the appropriate estimation of these channel effects at the receiver side...
Even though the wireless positioning in sensor networks has been extensively studied in the past decades, there is no contribution discussing positioning the receiver that belongs to another system, i.e., the third-party receiver. In this paper, we propose a new scheme to solve the problem by full-duplex rtechnique. In our scheme, we let the sensors conduct the full-duplex relay for the target receiver...
We present a low complexity experimental RF-based indoor localization system based on the collection and processing of WiFi RSSI signals and processing using a RSS-based multi-lateration algorithm to determine a robotic mobile node's location. We use a real indoor wireless testbed called w-iLab.t that is deployed in Zwijnaarde, Ghent, Belgium. One of the unique attributes of this testbed is that it...
With the revolution in the wireless communication and networks there is an increase urge for achieving higher data rates and mobility. The higher data rates give rise to the frequency selective propagation while carrier frequency offset and mobility induced Doppler shift introduces time selectivity in the wireless links, which is termed as Doubly selective. Modeling a Doubly selective channel is a...
Magnetic motion control of wireless biomedical capsule (WBC) have been a popular research topic recently. Use of embedded permanent magnet inside WBC and magnetic sensors outside the human body produces a magnetic field around passive WBC. This helps to calculate position and orientation of the WBC inside the human body as well as moving the WBC via magnetic force. In this paper, we present a hybrid...
Wireless capsule endoscopy (WCE) is an emerging technique to enhance Gastroenterologists information about the patient's gastrointestinal (G.I.) tract. Localization of capsule inside human body in this case is an active area of research. This can be thought of as a sub-domain of micro and bio-robotics fields. If capsule and micro-robot localization problem in human body is solved, then it may potentially...
Ultra wide band impulse radio(UWB-IR) transmission and its energy detection are effective to realize simple sensor network, wireless body area networks(BAN), etc. Under such network environments, simultaneous communication between many nodes is required and code division multiple access(CDMA) is one of the candidates of multiple access schemes. However, under multiple access situations, the degradation...
Realistic traffic modeling plays a key role in efficient Dynamic Spectrum Access (DSA) which is considered as enabler for the employment of wireless technologies in critical industrial automation applications (IAA). The majority of models of spectrum usage are not suitable for this specific use case as they are based on measurement campaigns conducted in urban or controlled laboratory environments...
In the Wireless Multimedia Sensor Networks (WM-SNs) field, real-time multimedia flow increases the probability of collision and congestion in sensor network which degrade the performance of Quality of Service (QoS). How to meet the high QoS requirement of WMSNs applications under the condition of energy constraint is a crucial issue. In this paper, we propose a predicted available bandwidth estimation...
In this paper, we are interested in localizing acoustic sources such as gunfire of Automatic Pistol (AP) and Kalashnikov AK-47 via the Imote2 wireless sensor node platform, using an array of four synchronized microphones connected to ITS400 sensor board of Imote2. More particularly, this work concerns the implementation of a localization algorithm based on the TDOA (Time Difference of Arrival) between...
In a previous work of the authors, it was shown that I/Q imbalance in the transmitter and receiver chains significantly deteriorates the achievable amount of self-interference suppression. Having there only analytically and simulatively analyzed the effect of I/Q imbalance, this paper gives experimental results and additionally extends the algorithm to also correct for the I/Q imbalance at the receiver...
This paper presents the development of a newly designed wireless piezoelectric (PZT) sensor platform for distributed active structure health monitoring (such as aircraft wings and bridges). The developed wireless PZT-sensor network features real-time data acquisition with high sampling rate up to 12.5MSPS (sample per second), distributed lamb-wave data processing and energy saving by reducing the...
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