Measurement-based analysis of Doppler characteristics for ultra-wideband radio channels in an office environment

In this work, an analysis of the Doppler characteristics for Ultra-Wideband indoor communication is presented. Channel sounding measurements ranging from 3.1 to 10.6 GHz were performed over the course of several days in an occupied office environment, with the help of a network analyzer. Based on these measurements, we analyze the behavior of both the Doppler spread and RMS Doppler spread in the Ultra-Wideband frequency band. Our measurements indicate a frequency-dependent behavior for both parameters, where consistent values could be measured with respect to time of observation

60 GHz MAC Standardization: Progress and Way Forward

Communication at mmWave frequencies has been the focus in the recent years. In this paper, we discuss standardization efforts in 60 GHz short range communication and the progress therein. We compare the available standards in terms of network architecture, medium access control mechanisms, physical layer techniques and several other features. Comparative analysis indicates that IEEE 802.11ad is likely to lead the short-range indoor communication at 60 GHz. We bring to the fore resolved and unresolved issues pertaining to robust WLAN connectivity at 60 GHz. Further, we discuss the role of mmWave bands in 5G communication scenarios and highlight the further efforts required in terms of research and standardization

Poster Abstract: Interconnecting Low-Power Wireless and Power-Line Communications using IPv6

Wireless sensor networks for building automation and energy management has made great progress in recent years, but the inherent indoor radio range limitations can make communication unpredictable and system deployments difficult. Low-power radio can be combined with low-power Power-Line Communication (PLC) to extend the range and predictability of indoor communication for building management and automation systems. We take the first steps towards exploring the system implications for integration of low-power wireless and PLC in the same network. We leverage IPv6, which allow networks to exist over multiple physical communication media as well as the RPL routing protocol for low-power lossy networks

A Software-Defined Multi-Element VLC Architecture

In the modern era of radio frequency (RF) spectrum crunch, visible light communication (VLC) is a recent and promising alternative technology that operates at the visible light spectrum. Thanks to its unlicensed and large bandwidth, VLC can deliver high throughput, better energy efficiency, and low cost data communications. In this article, a hybrid RF/VLC architecture is considered that can simultaneously provide light- ing and communication coverage across a room. Considered architecture involves a novel multi-element hemispherical bulb design, which can transmit multiple data streams over light emitting diode (LED) modules. Simulations considering various VLC transmitter configurations and topologies show that good link quality and high spatial reuse can be maintained in typical indoor communication scenarios

Alternative Doppler Extraction for Indoor Communication Signals

Radar is a common detection system for detecting the speed and velocity of moving objects. Radar is performed by transmitting a radio signal in the direction of a moving object and then processing the received reflected radio waves. The radar system processes the received signal to extract the Doppler frequency of the reflected waves, which reveals information about the velocity of the object. In traditional radar, the system uses one antenna for both the transmitter and the receiver. In passive bistatic radar, the transmit antenna and receiver antenna are separated. In addition, the radar system has no control over the transmitter. The transmitted signal is instead a signal of opportunity. Signals of opportunity include FM and AM radio signals, satellite GPS signals, and WiFi signals. The receiver in the radar system receives a signal of opportunity and extracts the Doppler frequency from the signal. The Doppler frequency can then be used to get the velocity of the object, which can be used for tracking the object. In previous research, the methods of traditional radar were applied to passive bistatic radar using a WiFi signal in order to track a moving object within a building. Traditional radar methods are to compare the Doppler-shifted signal to the original signal. In passive radar, the original signal needs to be measured without being affected by the Doppler-shifted signal, which requires a second antenna to be placed by the transmitter. The research presented suggests a new method of retrieving the Doppler frequencies from a communication signal. This new method does not require a separate antenna to get the original signal but uses knowledge about the communication signal to successfully measure the Doppler frequency on the signal. The system was implemented using GNURadio, a software-defined radio library. Additional processing was done using MATLAB

To mesh or not to mesh: flexible wireless indoor communication among mobile robots in industrial environments

Mobile robots such as automated guided vehicles become increasingly important in industry as they can greatly increase efficiency. For their operation such robots must rely on wireless communication, typically realized by connecting them to an existing enterprise network. In this paper we motivate that such an approach is not always economically viable or might result in performance issues. Therefore we propose a flexible and configurable mixed architecture that leverages on mesh capabilities whenever appropriate. Through experiments on a wireless testbed for a variety of scenarios, we analyse the impact of roaming, mobility and traffic separation and demonstrate the potential of our approach

Light-Fidelity as Next Generation Network Technology: A Bibliometric Survey and Analysis

This paper delivers a systematic review and a bibliometric survey analysis of Light-Fidelity (Li-Fi) indoor implementation in Next Generation Network (NGN). The main objective of this study is to design a communication network based on NGN-Li-Fi for the indoor implementation which aims to increase user Quality of Service (QoS). The main merits and contributions of this study are the thorough and detailed analysis of the review, both in literature surveys and bibliometric analysis, as well as the discussion of the implementation model challenges of Li-Fi in both indoor and outdoor environments. The issue articulated in an indoor communication network is the possibility of intermittent connectivity due to barriers caused by line-of-sight (LOS) between the LED transmitter and receiver, handover due to channel overlap, and other network reliability issues. To realize the full potential and significant benefits of the Next Generation Network, challenges in indoor communication such as load-balancing and anticipating network congestion (traffic congestion) must be addressed. The main benefit of this study is the in-depth investigation of surveys in both selected critical literatures and bibliometric approach. This study seeks to comprehend the implications of Next Generation networks for indoor communication networks, particularly for visible light communication channels

Indoor communication : Femtocell behavior in an indoor environment

The indoor Telecom coverage suffers poor reception, call distortion and low voice calling quality, by signal distortions and interference. In order to improve the quality and performance of voice calls service in the indoor environment, a number of base stations are required. Therefore, femtocells were introduced in the indoor environment for signal booster and other services for end users. Femtocells are deployed in the existing macrocell network coverage to enhance network coverage in an indoor environment. In this paper, we present the simulation base on the signal and the path loss model in the indoor environment, to show that femtocell enhanced indoor communication with improved signal strength without interference