Optimization and learning algorithms for orthogonal frequency division multiplexing based dynamic spectrum access

... presented for (i) optimization algorithms for DSA, and (ii) learning algorithms for DSA INTRODUCTION 1.4.1 Optimization algorithms for DSA In centralized DSA, there is a need for an optimization ... 1.3 Orthogonal frequency division multiplexingbased CR A CR requires a flexible and adaptive physical layer in order to efficiently perform its required tasks Orth...

Ngày tải lên: 09/09/2015, 10:19

... performance for channel estimation based Alnuaimy-Mahamod 112 interpolation using different techniques of pilot estimation with and without wavelet denoising 5.7 MSE performance for channel estimation ... different interpolation 113 technique using LS technique for pilot estimation combined with wavelet denoising 5.8 MSE performance for channel estimation b...

Ngày tải lên: 26/05/2013, 21:28

... proven for the two combiners provided in this paper, for more information see [12]) Therefore, one has to keep in mind that in quasistatic channels the performance gain due to the presence of the relay ... in the context of the point-to-point Gaussian channel In the context of the relay channel we know that the source -relay channel quality also plays a role in the...

Ngày tải lên: 22/06/2014, 00:20

... 1 TRAINING ISSUES AND LEARNING ALGORITHMS FOR FEEDFORWARD AND RECURRENT NEURAL NETWORKS TEOH EU JIN B.Eng (Hons., 1st Class), NUS A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR ... text and a reader, and the process of interpreting that text must take into account all three What then we mean in overall terms by Training Issues , Learning Algorithms and Feedforwa...

Ngày tải lên: 14/09/2015, 14:13

... 2002 [4] L J Cimini Jr., “Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing, ” IEEE Transactions on Communications, vol 33, no 7, pp 665– 675, 1985 ... task group 3a,” IEEE P802.15-03/268r2, November 2003 [6] B L Floch, M Alard, and C Berrou, “Coded orthogonal frequency division multiplex,” Proceedings of the IEEE, vol 83, no 6, pp 982–9...

Ngày tải lên: 22/06/2014, 22:20

... HUT S-72.333 Postgraduate Course in Radio Communications OFDM • Multi-carrier modulation /multiplexing technique • Available bandwidth is divided into several subchannels • Data is serial-to-parallel ... Can be done in time or in frequency domain E w/ interleaving E E E E E errors E E • One of the simplest form is block interleaving – Write row-by-row – Read column-by-column (or another wa...

Ngày tải lên: 11/07/2014, 20:21

... quan hệ viết ϕ ξη ( ) = ϕ ξξ ( ) * h(τ ) (PT) (3 . 9) Với ϕ ξη ( ) = E[ξ (t ) * (t + τ )] (3 .1 0) định nghĩa hàm tự tương quan trình ξ (t ) ϕ ξη ( ) = E[ξ (t ) * (t + τ )] (3 .1 1) định nghĩa hàm ... kỹ thuật OFDM { t0,t1}nếu: t1 ∫ f (t ) g (t )dt =0 (2 . 2) t0 Nếu f(t) g(t) hai hàm phức, tính chất định nghĩa :...

Ngày tải lên: 16/10/2014, 21:48

... published works include robust LMStype algorithms [11–13] Bayesian learning has been a powerful tool for developing sequential learning algorithms The problem is formulated as a maximum a posteriori ... response and the scaling factor thus constitute an LMS-type algorithm with an adaptive step size A major contribution of this work is thus the development of new sequential...

Ngày tải lên: 22/06/2014, 01:20

... choosing OFDMA such as multipath handling capability, scalability of operation in different bandwidths, the ability to handle different data rates, and the ability to easily combine with multiple ... antenna techniques Nhóm - The focus of this article is on the comparative use of OFDMA in LTE and WiMAX systems USE OF OFDMA IN WIMAX AND LTE Nhóm FRAME STRUCTURE USE OF OF...

Ngày tải lên: 24/07/2015, 22:26

... rộng OFDMA, LTE tiến bước xa thực bước đồng h a ban đầu không phụ thuộc băng thông Evolution of WiMax and LTE Như đề cập trước đó, WiMax LTE ứng viên cao th a mãn yêu cầu ITU IMT-Advanced cho ... đóng vai trò quan trọng l a chọn hệ thông wireless 4G nhà khai thác mạng Như đề cập trước đó, hầu hết nhà khai thác mạng ưu thích LTE WiMAX Các triển khai WiMAX nay, Sprint/Clear...

Ngày tải lên: 24/07/2015, 22:27

... applying machine learning algorithms to the semantic disambiguation of modifier -noun phrases The first approach is to use semantic properties of the noun and modifier words as attributes, using a lexical ... collect web frequencies for queries of the form “head joining term modifier” We did not collect queries of the form “modifier joining term head”; in the majority of...

Ngày tải lên: 20/02/2014, 12:20

... statistical machine translation In Proc of ACL, pages 160–167 K Papineni, S Roukos, T Ward, and W.-J Zhu 2002 BLEU: a method for automatic evaluation of machine translation In Proc of ACL, pages ... Chiang, K Knight, and W Wang 2009 11,001 new features for statistical machine translation In Proc of NAACL, pages 218–226 M Riedmiller and H Braun 1993 A direct adaptive method...

Ngày tải lên: 07/03/2014, 22:20

... among the disambiguations Related Work Wikipedia was first explored as an information source for named entity disambiguation and information retrieval by Bunescu and Pasca (2006) There, disambiguation ... Wikipedia articles that link to t The first step in G LOW is to extract all mentions that can refer to Wikipedia titles, and to construct a set of disambiguation candidat...

Ngày tải lên: 17/03/2014, 00:20

Ngày tải lên: 30/03/2014, 17:20

... optimal power and resource allocation and those obtained by power allocation only with equal resource allocation, for Scenario source -relay link and there is no benefit to allocate any relay power ... jointly optimal power and resource allocation and those obtained by power allocation alone with equal resource allocation for three-user system with...

Ngày tải lên: 22/06/2014, 01:20