Thuyết trình Orthogonal Frequency Division Multiple Access in WiMAX and LTE A Comparison

... 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

... Challenges 1.3 Inter- Carrier Interference Suppression in OFDMA Uplink 1.4 Outline 12 Chapter Inter- Carrier Interference in OFDMA System Uplink 13 2.1 Frequency Asynchronism ... division multiple access QPSK quaternary phase shift keying FFT fast Fourier transform SDMA space division multiple access IBI inter- block interference SB subspace ICI inter-...

Ngày tải lên: 14/09/2015, 14:03

... (GMSK) and quaternary phase shift keying (QPSK) Sophisticated multiple access technology like frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple ... BS Block Spreading CDD Cyclic Delay Diversity CDMA Code Division Multiple Access DFT Discrete Fourier Transform FDE Frequency Domain Equalizer FDMA Fre...

Ngày tải lên: 08/09/2015, 18:24

... both pilots and data are beamformed using the same weights In the WiMAX downlink (DL), beamforming weights are applied in units of clusters (14 sub-carriers), and in the uplink (UL) in units of ... and jns are continuous phases between [0, 2π) Substituting bn,m = Rn,m + jIn,m and ejjm = cos jm + j sin jm in Equation(9) and taking the square of |s(n)| results in Equatio...

Ngày tải lên: 21/06/2014, 01:20

... 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

... 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

... 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

... International Union of Radio Science (URSI ’05), New Delhi, India, October 2005 [12] H Schoeneich and P A Hoeher, “Semi-blind pilot-layer aided channel estimation with emphasis on interleave-division ... (1) training-based channel estimation (tb), (2) semiblind channel estimation (sb), and (3) blind channel estimation For tb, channel estimation is only ba...

Ngày tải lên: 22/06/2014, 23:20

... jointly define the multiple-access capacity region under the fading condition H As a result of the definition, the rate pairs in B1 (p) and B2 (p) only satisfy the constraint on the individual ... Signal Processing Consider first the simple case where the channel conditions are fixed, that is, H is constant The capacity region of the multiple-access channel i...

Ngày tải lên: 23/06/2014, 01:20

... Techniques for Code Division Multiple Access 23 2.1 Forms of Code Division Multiple Access 23 2.2 Direct Sequence Code Division Multiple Access ... 1.1.1 Time Division Multiple Access 1.1.2 Frequency Division Multiple Access 1.1.3 Code Division Multiple Access ... difference between CDMA and more widely understood orthogonal access techniq...

Ngày tải lên: 27/06/2014, 14:20

... Carrier Spacing Frequency Digital televsion techniques – Lecture 2013 17 17 COFDM Orthogonal carriers Digital televsion techniques – Lecture 2013 18 18 COFDM Orthogonal carriers Digital televsion ... channel – UHF channels • Digital TV can make use of these gaps Ch Ch Ch Ch Ch 9A VHF Television Spectrum Digital televsion techniques – Lecture 2013 Digital challenges • Digi...

Ngày tải lên: 09/07/2014, 08:16

... 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

Ngày tải lên: 25/07/2014, 09:39

... publisher Code Division Multiple Access (CDMA) R Michael Buehrer www.morganclaypool.com ISBN: 15 982904 01 ISBN: 97 815 98290400 paperback paperback ISBN: 15 9829041X ebook ISBN: 97 815 98290 417 ebook DOI 10 .2200/S00 017 ED1V01Y200508COM002 ... Conflict-Free Medium Access Control 1. 1 .1 Time Division Multiple Access 1. 1.2 Frequency Division Multiple Acce...

Ngày tải lên: 07/08/2014, 21:20