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Duplication transforms into a basic thought when spatiotemporal and secure communication required. In the wired network packet may be lost due to congestion but in wireless network packet may be loosed because of many things like- one is congestion and other is link failure, node failure, radio frequency interference, power failure etc. These are called random errors. The Flow of duplicacy increases...
Massive multiple-input multiple-output (Massive MIMO) is acknowledged as a key technology for the 5th generation (5G) of wireless communication systems, which theoretically proved to be of higher throughput, better robustness, superior spectrum- and energy- efficiency. A reliable and realistic channel model serves is the enabling foundation for practical design and testing of communication systems...
This paper reports on the design and development of a compact micro-electrocorticography (μECoG) system. The system is designed to record 8 channels of ECoG signals. Recorded neural data are sent off the system through a capacitive data telemetry link to the external world. The system has been prototyped using off-the-shelf electronic components and custom-designed electrodes, link, and package. For...
This paper explores a 60 GHz phased array system for ultra-high data rate communication in indoor environments. The channel modeling is addressed and the system link budget is calculated. A 16-element phased array system specifications are presented. This paper also presents the design of one of the key blocks — a 5-bit digitally controlled passive phase shifter. The switch-type phase shifter is implemented...
We have proposed and developed array-antenna-electrode electro-optic (EO) modulators for 5G mobile communication in densely-user-located environments. In this paper, we present the first demonstration of wireless data transfer in 60 GHz-band using an array-antenna-electrode EO modulator.
In recent years, with the rapid development of geographic information systems and internet technology, more and more methods are used to build location-based geographic information system. Under such circumstances, as a basic service, network map came into being and has been inserted into restaurants, buses, tourist industry and other industries. Therefore, the internet based map of the Internet applications...
We are developing a capsule ultrasound (CUS) device - a pill with the capability to scan the gastrointestinal (GI) tract through ultrasound. In this paper, we discuss the design and fabrication of the main components of the CUS device including the CMUT array, front-end electronics, and the wireless transmitter. We demonstrate a successfully fabricated 128-element CMUT array with polydimethylsiloxane...
A compact range wireless access system in the 60 GHz-band has been proposed for multi-Gb/s data transfer. A prototype GATE (Gigabit Access Transponder Equipment) was made to evaluate the coverage as well as the system performance of received power, bit-error rate (BER) and signal-to-noise ratio. Originally, the double-layer corporate-feed waveguide slot arrays with different number of elements were...
Monitoring utility-scale solar arrays was shown to minimize cost of maintenance and help optimize the performance of the array under various conditions. In this paper, we describe the design of an 18 kW experimental facility that consists of 104 panels fitted with smart monitoring devices. Each of these devices embeds sensors, wireless transceivers, and relays that enable continuous monitoring, fault...
A 60GHz-band compact-range wireless access system using a large array antenna can provide an uniform signal reception zone (less than 14 m distance from the antenna) and an almost multipath-free propagation environment. To evaluate the system performance, a wireless communication system for demonstration is constructed and the bit error rate (BER) and the signal-to-interference-plus-noise ratio (SINR)...
The paper presents results of an investigation of a MU-MIMO system suitable for providing broadband services. The base station has a circular array and each user has a single high gain antenna. Two optimum zero forcing beamformers are considered and semi-orthogonal user selection is used to schedule users in the downlink. A key point of the investigation is to determine the maximum number of users...
This work proposes a 12b 60MS/s 0.11μm CMOS Flash-SAR ADC for wireless communication systems. The proposed Flash-SAR ADC is implemented with a 4b flash ADC and a 9b SAR ADC for high speed operation with low power consumption. Furthermore, the shared single sampling-network minimizes a sampling-time mismatch between the flash ADC and the SAR ADC, which is commonly observed in a Flash-SAR ADC without...
We discuss the SINR-maximization problem for analog receive beamforming with finite resolution phase shifters and amplifiers. This discrete optimization problem can be globally solved by means of branch-and-bound. The performance of the algorithm depends on the quality of bounds for the subproblems which are determined within the branch-and-bound procedure. These subproblems can be generated by a...
To measure the physiological parameter accurately, a plenty of sensors are placed in, on or around the human body, which form the Wireless Body Area Network(WBAN). But for energy saving, some sensors can be chosen to achieve the same goal. So an iterative convex optimization algorithm with constrained beam-pattern synthesis of sensor selection is proposed to solve this problem. In the optimization...
In the paper, we describe a design of a slot antenna array feeding by a substrate integrated waveguide (SIW) resonator. The structure operates at the frequency 60 GHz in proximity of a human body. The study shows impedance matching and radiation properties of the designed antenna array and transmission properties of an on-body link, which can be influenced by interactions of electromagnetic waves...
Proposed chip designed a continuous time lowpass sigma-delta ADC including health transducer and wireless sensor on tracheostomy tube for intelligent networking in hospital. The measured results have achieved a dynamic range of 52 dB over a 5 MHz signal bandwidth, a peak SNDR of 55.33 dB and power dissipation of 24.5 mW. This proposed has built in near-infrared laser-driven (NIRLD) might be a promising...
The variety of signals encountered in the representation of multidimensional systems means that, unlike standard linear time invariant systems, there are many state-space model structures that can be used to represent the dynamics. This paper considers the Fornasini-Marchesini state-space model introduced almost four decades ago, which has been the basis for the derivation of many systems theoretic...
This paper proposes a novel scheme of vector-sum phase shifters. Conventional phase shifters that use 4-phase type require a very large dynamic range for variable gain amplifiers (VGAs) as increasing the resolution of the value of phase shift. The proposed scheme adopts 6-phase or 8-phase type vector-sum phase shifters that reduce the required dynamic range for the VGAs dramatically. Based on the...
The pulsed-field excited array antenna performance is studied via full time-domain instruments. The directional distribution of radiated energy and the directional (system) fidelity factor are employed as performance metrics. Illustrative numerical experiments highlight the expedient radiation features that are specific to pulse-train excited, linear array antennas. The analysis provides an expedient...
Beam steering and beam shaping with parasitic array antennas pose a suitable alternative to expensive phased array technology. Parasitic array antennas mainly consist of one or few active antenna elements which are surrounded by passive elements. The parasitic reactances of the passive elements can be controlled either by electronic tuning or switching. Doing this in a suitable way different antenna...
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