LTE performance evaluation with realistic channel quality indicator feedback

In the context of mobile communications, the availability of new services and mobile applications along with the constant evolution in terminals run up the need of higher data rates. In order to fulfill such expectations, mobile operators are continually optimizing and upgrading their networks. The Long Term Evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) seems to be the path to follow in a very short term. The objective of this project is to study the behaviour of the radio resource assignment in LTE under realistic conditions. The scheduling is a key process in the functioning of the radio interface. Thus, two types of schedulers can be identified, the opportunistic, where the scheduler considers the state of the radio channel to make the best allocation possible, and the non-opportunistic, where the allocation has no knowledge of the radio channel‘s state. As the opportunistic option adapts to the radio channel conditions it requires the transmission of a certain level of signalling from users informing about how the channel evolves along time. One of the objectives of this project is to evaluate the system performance under different degrees of feedback. To do this, different CQI reporting methods have been programmed and simulated. So, to achieve this objective it is obvious that a second one is necessary: program and simulate in a more realistic way the LTE radio channel. The followed methodology has been fundamentally the programming of different mathematical models and algorithms, as well as its simulation. In concrete, one of the main tasks in this work has been to extent a software platform of the research group Wicomtec to obtain more realistic results through dynamic simulations over a dynamic radio channel

LTE performance evaluation with realistic channel quality indicator feedback

In the context of mobile communications, the availability of new services and mobile applications along with the constant evolution in terminals run up the need of higher data rates. In order to fulfill such expectations, mobile operators are continually optimizing and upgrading their networks. The Long Term Evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) seems to be the path to follow in a very short term. The objective of this project is to study the behaviour of the radio resource assignment in LTE under realistic conditions. The scheduling is a key process in the functioning of the radio interface. Thus, two types of schedulers can be identified, the opportunistic, where the scheduler considers the state of the radio channel to make the best allocation possible, and the non-opportunistic, where the allocation has no knowledge of the radio channel‘s state. As the opportunistic option adapts to the radio channel conditions it requires the transmission of a certain level of signalling from users informing about how the channel evolves along time. One of the objectives of this project is to evaluate the system performance under different degrees of feedback. To do this, different CQI reporting methods have been programmed and simulated. So, to achieve this objective it is obvious that a second one is necessary: program and simulate in a more realistic way the LTE radio channel. The followed methodology has been fundamentally the programming of different mathematical models and algorithms, as well as its simulation. In concrete, one of the main tasks in this work has been to extent a software platform of the research group Wicomtec to obtain more realistic results through dynamic simulations over a dynamic radio channel

Aeronautical engineering: A continuing bibliography with indexes (supplement 284)

This bibliography lists 974 reports, articles, and other documents introduced into the NASA scientific and technical information system in Oct. 1992. The coverage includes documents on design, construction, evaluation, testing, operation, and performance of aircraft (including aircraft engines) and associated components, equipment, and systems. It also includes research and development in aerodynamics, aeronautics, and ground support equipment for aeronautical vehicles

University of Maine Catalog for 1972

This University of Maine catalog for the year 1972 includes the academic calendar, a list of the Board of Trustees and administration, general information about the university, student activities, admission, Veterans Administration information, financial information, loans and scholarships, the University of Maine Foundation Funds, prizes, the Environmental Studies program, colleges (Arts and Sciences; Business Administration; Education; Life Sciences and Agriculture; and Technology), Graduate School, military science, physical education and athletics, continuing education courses, summer session, educational television and radio programs, University of Maine at Bangor, personnel, and a summary of student enrollment

Cognitive complexity revisited

Cognitive Complexity is an important and obtrusive phenomenon over a wide range of situations, and is worthy of study in its own right. Although the term "Cognitive Complexity" occurs in an informal way in the psychological literature, there is no general agreement about what it means or connotes. A new approach was needed in order to re-conceptualise cognitive complexity. This re-conceptualisation originated in the unobtrusive observation of cognitive complexity in a relatively free, uncontrolled and naturalistic environment. From this came the formulation of an appropriate and explicit methodology, which encouraged subjects to display cognitive complexity in an unhurried way in a private interview situation by talking about topics in the news and personal issues. Initial experimental techniques (including an impressionistic analysis, pen pictures and a content analysis), led on to the development of the main analysis which identified types of cognitive complexity and their constituents in the interview transcripts. The types of cognitive complexity identified were true (divided into outstanding and pedestrian), disjunctive, borderline, no cognitive complexity and secondhand cognitive complexity. The main constituents of true cognitive complexity (outstanding) were systemic and penetrating thinking, independence of thought and truth-seeking. Pedestrian cognitive complexity was characterised by analogical and investigative reasoning, clarity and incisiveness. The importance of this re-conceptualisation of cognitive complexity is that it has resulted in the development of a new methodology which facilitates the display by subjects of more than one type of cognitive complexity. This methodology which identifies the types of cognitive complexity can be applied in real-life situations in which people are facing complex decisions