نتایج جستجو برای: estimation techniques
تعداد نتایج: 868288 فیلتر نتایج به سال:
This document constitutes the consolidated deenition of Chimera; it is a revised version of the T21D2 deliverable presented in June 1993 Author(s):
In this paper, various channel estimation techniques for iterative receivers are compared for OFDMIDMA system. Pilot –assisted based, semi-blind estimation, blind estimation and Decision –directed channel estimations techniques are considered and there comparisons are presented. The considered estimation techniques differ in terms of complexity, as well as performance. The main contribution of ...
Channel Estimation refers to the evaluation of the performance of a channel through which the data is sent. MIMO OFDM(Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing) systems are quite effective in terms of sending bulk data to the receiving end but it suffers with few problems also, like high amplification to noise ratio, etc. In such a scenario estimation techniques ...
We propose channel estimation and direct equalization techniques for transmission over doubly selective channels. The doubly selective channel is approximated using the basis expansion model (BEM). Linear and decision feedback equalizers implemented by time-varying finite impulse response (FIR) filtersmay then be used to equalize the doubly selective channel, where the time-varying FIR filters ...
Software project management software is the most important activity in software development, because it contains the whole software development process, from beginning to end. Software cost estimation is a challenge task in the software project management. It is an old activity in computer industry from 1940s and has been developed many times. Effort, only covers part of the cost of a software ...
due to extraordinary large amount of information and daily sharp increasing claimant for ui benefits and because of serious constraint of financial barriers, the importance of handling fraud detection in order to discover, control and predict fraudulent claims is inevitable. we use the most appropriate data mining methodology, methods, techniques and tools to extract knowledge or insights from ...
Road traffic volumes in intercity roads are generally estimated by probability functions, statistical techniques or meta-heuristic approaches such as artificial neural networks. As the road traffic volumes depend on input variables and mainly road geometrical design, weather conditions, day or night time, weekend or national holidays and so on, these are also estimated by pattern recognition te...
this study examines the effetivenss of task-based activities in helping students learn english language structures for a better communication. initially, a michigan test was administered to the two groups of 52 students majoring in english at the allameh ghotb -e- ravandi university to ensure their homogeneity. the students scores on the grammar part of this test were also regarded as their pre...
Effort estimation is important for the control, quality and success of any software development product. Most efficient categories of effort estimation is Expert judgment, Algorithmic estimation and Machine Learning. The aim of this paper is to present the comparative analysis between traditional techniques and Machine Learning (ML) techniques. Results show that ML methods give more accurate ef...
In this paper, we investigate channel estimation techniques for wireless receivers. Channel estimation is important for wireless applications because a wireless channel has fading characteristics and time varying impulse response. OFDM is a multi-carrier modulation technique wherein we use a set of orthogonal sub-carriers. OFDM divides the entire frequency band into several sub bands. The sub-c...
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