Ultra-Low-Power and Ultra-Low-Cost Short-Range Wireless Receivers in Nanoscale CMOS ab 85.49 € als pdf eBook: . Aus dem Bereich: eBooks, Sachthemen & Ratgeber, Technik,
Ultra-Low-Power and Ultra-Low-Cost Short-Range Wireless Receivers in Nanoscale CMOS ab 129.99 € als gebundene Ausgabe: 1st ed. 2016. Aus dem Bereich: Bücher, Wissenschaft, Technik,
Ultra-Low-Power and Ultra-Low-Cost Short-Range Wireless Receivers in Nanoscale CMOS ab 129.99 EURO 1st ed. 2016
Ultra-Low-Power and Ultra-Low-Cost Short-Range Wireless Receivers in Nanoscale CMOS ab 85.49 EURO
Cell phones have already become more than “simple” communication devices and are used even when driving. For this purpose, a connection of in-vehicle devices with a mobile communication network has to be established. Due to the metallic body of the vehicle accompanied by strong radio field attenuations, the in-vehicle coverage is partly not provided and the successful use of services cannot be guaranteed. This problem could be solved by splitting the communication link into two parts. On the one hand, the passengers’ mobile devices are integrated into a wireless in-vehicle network provided by the vehicle itself. Thus, the passengers are able to access all kinds of content managed by the central multimedia platform of the vehicle. For the purpose of setting-up in-vehicle communications, Ultra Wide Band (UWB) as well as 60 GHz short-range systems are potential solutions due to high data rates and very low-cost devices. The adaption of these systems to the properties of the vehicle interior enables high-quality links. On the other hand, the vehicle is connected with surrounding communication networks in order to access the desired infotainment services and to receive traffic information to enhance the road safety as well as traffic efficiency. For example by forwarding information about traffic hazards in areas of limited visibility, other vehicles in the vicinity can be warned beforehand. Therefore, highly robust data transmission with low latencies as well as high locality is required. This can be achieved with the introduction of the so-called Vehicle-to-X (V2X) communication enabling vehicles to communicate directly with their surrounding infrastructure (Vehicle-to-Infrastructure (V2I) communication) as well as with each other (Vehicle-to-Vehicle (V2V) communication). In order to ensure a reliable deployment of communication applications in the vehicular environment, a previous validation of the system has to be performed.This thesis deals with the simulation of communication applications in vehicular environments with the main focus on the radio channel, on the influence of the antenna configuration as well as on the Packet Error Rate (PER) performance of the Physical Layer (PHY). For the validation of V2X communication systems and applications, several interconnected and specialized simulation tools are integrated into a comprehensive simulation environment. It consists of modules to simulate the PHY, the vehicular mobility as well as the radio channel. A self-developed deterministic 3D ray-optical model is used in order to achieve a realistic description of the channel for specific V2X scenarios. Since ray-optical models are still very time-consuming and the computing time is crucial for the overall performance of the simulator, two optimizing acceleration techniques are developed and evaluated. The selection of an optimum antenna configuration, the urban vehicular radio channel and the PER performance of the PHY are investigated for specific situations with the aid of the integrated simulator. Moreover, a stochastic propagation model for urban crossroads scenarios including the influence of an application-specific antenna module is developed on the basis of the simulation environment. With this approach, the feasibility of a V2V application is analyzed in worst case scenarios.Since the dimensions of the objects within the vehicle are smaller than the wavelength of the considered in-vehicle systems, an application of the deterministic ray-optical model is not feasible. Thus, extensive UWB channel measurement campaigns in a variety of scenarios and different vehicles are carried out. The influence of the vehicle type, the antenna position and the occupation by passengers is in the focus of this thesis. The in-vehicle UWB channel is analyzed and empirical models are derived consequently. Furthermore, the performance and the feasibility of a UWB system in terms of the Bit Error Rate are investigated using a PHY simulator. Finally, a comparison of UWB and 60 GHz inside vehicles with respect to the channel properties is examined.
Ultra wideband (UWB) is a very promising communications technology under active research, development, regulation, and standardization efforts, with applications in computer and communications, consumer, radar, automotive, and cable communications. Impulse radio (IR) is an UWB modulation that uses waveforms that consist of trains of time-shifted sub nanosecond pulses. Data is transmitted using pulse position modulation at a rate of many pulses per symbol. Multiple access capability is achieved using spread spectrum time hopping. The IR-UWB promises to be a viable technique to build relatively simple and low-cost, low-power transceivers that can be used for short range, high speed multiple-access communications over the multipath indoor wireless channel. In this book we study the performance of IR-UWB under different scenarios. First, we provide an overview of the research, development and regulations efforts related to IR-UWB. Secondly, we include examples of signal design and an assessment of the performance of IR-UWB in the presence of noise, multipath, and multiple access interference. Finally, we discuss some of the tradeoffs between performance and receiver complexity.
In recent year, the 3GPP LTE/LTE-A wireless access technology is a hot research topic. More recently, the femtocell network have received significant attention that many specifications and standards are discussed vehemently. Femtocells are short-range coverage, low cost and low power cellular base stations, designed for the use in a home or small business environment. The purposes of femtocell are to enhance communication quality when the user is located in the weak signal area, share wireless system loadings, and promote spectrum utilization. Although the femtocell network owns several advantages, many challenges in macro/femtocell networks should be solved. In this book, we focus on the resource management and mobility management issues in LTE-based macro/femtocell networks. We survey these two issues, discuss many topics and then provide some feasible solutions in LTE-based macro/femtocell hybrid networks.
In wireless communication we mainly exploit the Electromagnetic Spectrum. Earlier systems were narrowband long range systems but in order to extend the use of available spectrum we are now using UWB (Ultra-wide band) short range systems which have advantages of low power consumption, high date rate, high time resolution,low-cost implementation, obstacle penetration, resistance to interference, covert transmission, co-existence with narrowband systems and so on. Such advantages enable a wide range of applications of UWB to communications, radar, imaging and positioning. These are built using inexpensive digital components. Microstrip antenna is used for implementing UWB systems as it shows good broadband characteristics. We propose a compact planar rectangular dual band notched microstrip line fed Microstrip Antenna for UWB applications. The proposed antenna is designed using simulation software CADFEKO VERSION 6.2. This band-notched antenna has rejection characteristics at 3.5 GHz (for Wi-MAX band-3.3 to 3.7GHz), at 5.5 GHz (for WLAN 2 band- 5 to 6 GHz).
We are currently witnessing a massive development of industrial production in many areas. The subjects developed production are placed relatively high demands on reliability, durability, practicality of use, durability but also a low cost, short production time, and other available materials. Therefore, efforts to find solutions and structures that can meet even in difficult conditions and yet retain the desired characteristics within the desired range. The presented study addressed the possibility of implementing the methods for the detection of changes of parameters influence the overall behavior of the system in MATLAB. Easy to enter tasks and advanced tracking options enable speech systems to better understand their immanent properties, determine and identify the parameter values in the range of optimum response, expect and anticipate possible impacts of changes in overall system behavior in real conditions.