The smart grid is conceived of as an electric grid that can deliver electricity in a controlled, smart way from points of generation to active consumers. Demand response (DR), by promoting the interaction and responsiveness of the customers, may offer a broad range of potential benefits on system operation and expansion and on market efficiency. Moreover, by improving the reliability of the power system and, in the long term, lowering peak demand, DR reduces overall plant and capital cost investments and postpones the need for network upgrades. In this paper a survey of DR potentials and benefits in smart grids is presented. Innovative enabling technologies and systems, such as smart meters, energy controllers, communication systems, decisive to facilitate the coordination of efficiency and DR in a smart grid, are described and discussed with reference to real industrial case studies and research projects.

Demand response and smart grids—A survey

This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

With the explosive growth of mobile data demand, the fifth generation (5G) mobile network would exploit the enormous amount of spectrum in the millimeter wave (mmWave) bands to greatly increase communication capacity. There are fundamental differences between mmWave communications and existing other communication systems, in terms of high propagation loss, directivity, and sensitivity to blockage. These characteristics of mmWave communications pose several challenges to fully exploit the potential of mmWave communications, including integrated circuits and system design, interference management, spatial reuse, anti-blockage, and dynamics control. To address these challenges, we carry out a survey of existing solutions and standards, and propose design guidelines in architectures and protocols for mmWave communications. We also discuss the potential applications of mmWave communications in the 5G network, including the small cell access, the cellular access, and the wireless backhaul. Finally, we discuss relevant open research issues including the new physical layer technology, software-defined network architecture, measurements of network state information, efficient control mechanisms, and heterogeneous networking, which should be further investigated to facilitate the deployment of mmWave communication systems in the future 5G networks.

A survey of millimeter wave communications (mmWave) for 5G: opportunities and challenges

Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access: the policy that addresses the spectrum scarcity problem that is encountered in many countries. Thus, CR is widely regarded as one of the most promising technologies for future wireless communications. To make radios and wireless networks truly cognitive, however, is by no means a simple task, and it requires collaborative effort from various research communities, including communications theory, networking engineering, signal processing, game theory, software-hardware joint design, and reconfigurable antenna and radio-frequency design. In this paper, we provide a systematic overview on CR networking and communications by looking at the key functions of the physical (PHY), medium access control (MAC), and network layers involved in a CR design and how these layers are crossly related. In particular, for the PHY layer, we will address signal processing techniques for spectrum sensing, cooperative spectrum sensing, and transceiver design for cognitive spectrum access. For the MAC layer, we review sensing scheduling schemes, sensing-access tradeoff design, spectrum-aware access MAC, and CR MAC protocols. In the network layer, cognitive radio network (CRN) tomography, spectrum-aware routing, and quality-of-service (QoS) control will be addressed. Emerging CRNs that are actively developed by various standardization committees and spectrum-sharing economics will also be reviewed. Finally, we point out several open questions and challenges that are related to the CRN design.

Cognitive radio networking and communications: an overview

Millimeter wave (mmWave) communications have recently attracted large research interest, since the huge available bandwidth can potentially lead to the rates of multiple gigabit per second per user Though mmWave can be readily used in stationary scenarios, such as indoor hotspots or backhaul, it is challenging to use mmWave in mobile networks, where the transmitting/receiving nodes may be moving, channels may have a complicated structure, and the coordination among multiple nodes is difficult To fully exploit the high potential rates of mmWave in mobile networks, lots of technical problems must be addressed This paper presents a comprehensive survey of mmWave communications for future mobile networks (5G and beyond) We first summarize the recent channel measurement campaigns and modeling results Then, we discuss in detail recent progresses in multiple input multiple output transceiver design for mmWave communications After that, we provide an overview of the solution for multiple access and backhauling, followed by the analysis of coverage and connectivity Finally, the progresses in the standardization and deployment of mmWave for mobile networks are discussed

Millimeter Wave Communications for Future Mobile Networks

It had been shown that the working gain of about 7 dBi can be realized by a three-element Yagi-Uda antenna even if the inter-element spacing is narrowed down to 0.025 wavelength, which is one-tenth of the normal interval [1]. The antenna becomes narrowband as a compensation for compactness. The narrowband is not disadvantageous for use in an inter vehicle communications system to prevent traffic accidents because the allocated frequency band is narrow (10 MHz in the frequency band from 710 MHz to 730 MHz) in Japan. However, a three-element Yagi-Uda antenna can be used in many applications if its frequency band is enhanced. Thus, enhancement of the frequency band is examined in this study. The antenna is designed for the frequency band, 720 MHz, that is the same as that of the inter vehicle communications system because the application for developing this antenna is not specified.

Study on bandwidth enhancement of three-element Yagi-Uda antenna with narrow spacing

For the coexistence management between primary and secondary users in TV white space, a simple propagation model for short range transmission and low antenna height is needed to define the interference risk area to primary user from secondary user. For estimating the area, measurements of building penetration loss have been conducted at UHF band, and a propagation model based on free space loss with additional building passage losses is proposed.

http://ieeexplore.ieee.org/iel7/7057737/7067568/07067663.pdf

Building penetration loss measurements for TVWS systems

This paper proposes a cognitive interference- mitigation technique for a hybrid direct sequence (DS) multiband (MB) ultra wideband (UWB) system. Theoretical framework of the DS-MB-UWB multiple access system employing cognitive interference-detection and mitigation is constructed over multipath environment in the presence of a coexisting narrowband wireless system. Interference mitigation is achieved through partially suppressing the power of the particular sub-band coexisting with the narrowband signal. A typical error performance improvement of around 10 fold can be achieved by suppressing 75% power of the affected sub-band. Additionally, increasing the number of sub- bands is found to achieve more improvement than increasing the number of DS chips. This paper attempts to develop a cognitive mitigation technology able to obtain optimum performance improvement while maintaining the highest possible frequency diversity.

Cognitive interference-mitigation technique for hybrid DS-Multiband-UWB multiple access system

PROBLEM TO BE SOLVED: To provide a receiver or the like suitable for transmission of a data signal whose length ratio to the length of a known signal is large SOLUTION: A reception signal 201 outputs a reception signal 102, an estimate section 202 estimates a propagation characteristic 103 on the basis of the reception section 102 and a modulated data signal 106, a compensation section 203 outputs a compensated data signal 104 from the reception signal 102 and the propagation path characteristic 103, a demodulation section 204 demodulates a demodulated data signal 105 from the compensated data signal 104, and a modulation section 205 modulates the modulated data signal 106 from the demodulated data signal 105 The estimate section 202 compares the modulated known data with a known data part of the reception signal to start estimation and the compensation section 203 uses the propagation path characteristic that is estimated to compensate a data signal part not compensated COPYRIGHT: (C)2001,JPO

Receiver, reception method, and information recording medium

PROBLEM TO BE SOLVED: To provide a radio communication terminal, etc., capable of executing communication, even if a shielding objects exists on the way in radio communication, using a frequency band suited to viewing communication. SOLUTION: An initial detection part 102 detects whether its own terminal can communicate with another terminal of a master station mode or not. When the communication can be executed, a slave station mode setting part 104 sets up a slave station mode, registers the other terminal in a master terminal storage part 106, and transmits a message that its own terminal is dependent on the other terminal. When the communication can't be executed, a master station mode setting part 107 sets up the master station mode. In the case of the master station mode, at the time of receiving the message that the terminal is dependent on the other terminal in the master station mode, a slave station terminal registering part 108 registers the received contents in a slave terminal storage part 109, a master station maintenance detection part 110 periodically checks whether communication with the slave station can be executed, and a slave station maintenance detection part 111 periodically checks whether communication with the master station can be executed; and when communication cannot be conducted, an unfixed mode setting part 112 sets up an unfixed mode, a transmitting part 113 transmits a message and a reception part 114 receives the message.

Hiroshi Harada

Papers

Study on bandwidth enhancement of three-element Yagi-Uda antenna with narrow spacing

Building penetration loss measurements for TVWS systems

Cognitive interference-mitigation technique for hybrid DS-Multiband-UWB multiple access system

Receiver, reception method, and information recording medium

Radio communication terminal, its method and information recording medium