Search results for "GATT"

PHY and MAC layer performance optimization of the IEEE 802.16 system

2012

Energy efficient optimisation for large-scale multiple-antenna system with WPT

2018

In this study, an energy-efficient optimisation scheme for a large-scale multiple-antenna system with wireless power transfer (WPT) is presented. In the considered system, the user is charged by a base station with a large number of antennas via downlink WPT and then utilises the received power to carry out uplink data transmission. Novel antenna selection, time allocation and power allocation schemes are presented to optimise the energy efficiency of the overall system. In addition, the authors also consider channel state information cannot be perfectly obtained when designing the resource allocation schemes. The non-linear fractional programming-based algorithm is utilised to address the …

Studies on high speed uplink packet access performance enhancements

2014

Analysis and performance of FBMC techniques with application to relay networks

2014

An Efficient and Privacy-Preserving Blockchain-Based Authentication Scheme for Low Earth Orbit Satellite Assisted Internet of Things

2022

Recently, integrating satellite networks (e.g. Low-earth-orbit satellite constellation) into the Internet of Things (IoT) ecosystem has emerged as a potential paradigm to provide more reliable, ubiquitous and seamless network services. The LEO satellite networks serves as a key enabler to transform the connectivity across industries and geographical border. Despite the convenience brought from the LEO satellite networks, it arises security concerns, in which the essential one is to secure the communication between the IoT devices and the LEO satellite network. However, some challenges inheriting from the LEO satellite networks need to be considered : 1) the dynamic topology; 2) the resource…

A comparison of the impacts of introduced signal crayfish and native noble crayfish in boreal lake ecosystems

2014

Design and evaluation of self-healing solutions for future wireless networks

2016

This doctoral dissertation is aimed at the creation of comprehensive and innovative Self-Organizing Networks (SON) solutions for the Network Management of future wireless networks. More specifically, the thesis focuses on the Self-Healing (SH) part of SON. Faults can appear at several functional areas of a complex cellular network. However, the most critical domain from a fault management viewpoint is the Radio Access Network (RAN). The fault management of network elements is not only difficult but also imposes high costs both in capital investment (CAPEX) and operational expenditures (OPEX). The SON concept has emerged with the goal to foster automation and to reduce human involvement in man…

Ei-yhteistoiminnallisten pelien sovelluksia langattomissa verkoissa

2011

Laitinen, Jouni Ei-yhteistoiminnallisten pelien sovelluksia langattomissa verkoissa Jyväskylä: Jyväskylän yliopisto, 2011, 36 s. Tietojenkäsittelytiede, kandidaatin tutkielma Ohjaaja: Hirvonen, Pertti Peliteorian suosio on viime vuosina kasvanut uusien sovellusten myös. Näihin sovelluksiin kuuluu myös langattomat tietoverkot ja niissä tapahtuvat kanssakäynnit. Peliteorian avulla näitä tapahtumia voidaan analysoida tarkemmin ja niiden tehokkuutta nostaa. Tässä kirjallisuuteen pohjautuvassa kandidaatin tutkielmassa esitellään ensin peliteorian perusteita, joita sitten sovelletaan langattomien tietoverkkojen eri ongelmiin. Näitä ongelmia ovat: lähetystehon määrittäminen, taajuuden vaihtaminen …

Alterations in Daphnia magna exposed to enniatin B and beauvericin provide additional value as environmental indicators

2022

Mycotoxins beauvericin (BEA) and enniatin B (ENN B) affect negatively several systems and demand more studies as the mechanisms are still unclear. The simultaneous presence of contaminants in the environment manifests consequences of exposure for both animals and flora. Daphnia magna is considered an ideal invertebrate to detect effects of toxic compounds and environmental alterations. In this study, the potential toxicity and the basic mechanism of BEA and ENN B individually and combined were studied in D. magna. Acute and delayed toxicity were evaluated, and transcript levels of genes involved in xenobiotic metabolism (mox, gst, abcb1, and abcc5), reproduction, and oxidative stress (vtg-S…

Energy efficiency in wireless networks

2013

Tämä pro gradu -työ on sekundääritutkimuksena tehty kirjallisuuskatsaus energiatehokkuuden tarkastelusta langattomissa verkoissa. Työssä tarkastellaan erilaisia mobiiliverkkojen energiansäästömahdollisuuksia. Pääpaino työssä on suunnattu erityisesti 3G ja LTE -verkkoihin, kuitenkin eksoottisempiakaan verkkoja unohtamatta. Työ alkaa erilaisten mobiiliverkkojen energiansäästösyiden ja tutkimusmotivaattoreiden tunnistamisella ja jatkuu langattomien verkkojen energian kulutuksen jaotuksella, sekä erilaisten energiansäästömahdollisuuksien vertailuilla. Työn empiirisessä osassa nostetaan lisäksi esille lyhyt Octave-simulaatio kollaboroivan mobiilipilven noodien energiansa…