orthogonal frequency division multiplexing abstract

Ngày tải lên: 26/05/2013, 21:28

... 2006 One of the UWB proposals in the IEEE P802.15 WPAN project is to use a multiband orthogonal frequency- division multiplexing (OFDM) system and punctured convolutional codes for UWB channels supporting ... inter-symbol interference (ISI) caused by multipath channels are equalization and orthogonal frequency- division multiplexing (OFDM) [4]. OFDM is a promising solution for efficiently capturing multipath ... May 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,...

Ngày tải lên: 22/06/2014, 22:20

... Pietikäinen Communications Laboratory / HUT S-72.333 Postgraduate Course in Radio Communications Orthogonal Frequency Division Multiplexing Kari Pietikäinen kari.pietikainen@hut.fi Postgraduate Course in Radio ... IFFT / FFT pair is the key factor in OFDM – IFFT: From frequency domain to time domain – FFT: Vice versa ã All signal processing is made in frequency domain ã IFFT / FFT low implementation cost ... Signal processing made digitally in the frequency domain IFFT/FFT pair ã Guard time is added to reduce effects caused by multipath propagation ã Tolerant to frequency- selective fading – Information...

Ngày tải lên: 11/07/2014, 20:21

Ngày tải lên: 16/10/2014, 21:48

... television Coded Orthogonal Frequency Division Multiplexing ã Need for a good transmission technique ã Explanation of the different parts ã Coded ã Frequency Division Multiplexing ã Orthogonal ... …Mathematical description of COFDM Zeroth frequency = 0 gives Compare with IFT Equivalent if 13 17 2013 Digital televsion techniques – Lecture 7 Frequency Minimum Carrier Spacing Traditional ... – Lecture 7 DVB-C in the World 31 19 2013 Digital televsion techniques – Lecture 7 COFDM Orthogonal carriers 19 29 The DVB-T standard gives specific values used in implementations...

Ngày tải lên: 09/07/2014, 08:16

... Coarse Wavelength Division Multiplexing (CWDM) Generate More Revenue with Less Fiber Here's How it Works In simple ... MDU/ BUSINESS Satellite Uplink F i b e r L i n e W a v e l e n g t h s The CWDM Advantage ADC Coarse Wave Division Multiplexing (CWDM) Solutions, part of the ADC’s Value-Added Module (VAM) family, add flexibility...

Ngày tải lên: 21/12/2013, 07:17

... Page 2 ADC Coarse Wavelength Division Multiplexing CWDM VAM Module Ordering Guide and Information Catalog Number CW __ __ __ - __ ... EightChannelStandard1470nm,1490nm,1510nm,1530nm,1550nm,1570nm,1590nm, 1610with1310nmupgrade. Page 4 ADC Coarse Wavelength Division Multiplexing CWDM VAM Module Ordering Guide and Information Application #1: Ordering a MicroVAM ... nm 1530 nm 1510 nm 1330 nm Common Port or Input Optical Components Page 6 ADC Coarse Wavelength Division Multiplexing CWDM VAM Module Ordering Guide and Information CWDM Module Types WideVAM đ VMW UsedwithADC8"FCMandindustry- standard...

Ngày tải lên: 17/01/2014, 11:20

... the chunk resources, so-called frequency- adaptive (FA) transmission [9]. Adaptive Orthogonal Frequency Division Multiple Access (OFDMA) with a chunk-based Time Division Multiple Access (TDMA) ... equidistantly frequency- separated blocks, each consisting of a few subcarriers, are allocated to each user. A Discrete Fourier Transform (DFT) pre- coding step is performed on each Orthogonal Frequency- Division ... described in [13], also denoted as Interleaved Frequency Division Multiple Access (IFDMA) in the original paper [14]or Single-Carrier Frequency Division Multiple Access (SC- FDMA) with distributed...

Ngày tải lên: 21/06/2014, 22:20

... w rd (n), (2) where the notation is dened above. Orthogonality between the received cooperation signal y rd and direct signal y sd can be implemented by frequency division (FD). The optimal bandwidth allocation ... in this paper are quasistatic orthogonal relay channels for which orthogonality is defined accordingly to [1]. Since the source-destination channel is assumed to be orthogonal to the relay-destination ... pages doi:10.1155/2007/20258 Research Article Practical Quantize-and-Forward Schemes for the Frequency Division Relay Channel B. Djeumou, 1 S. Lasaulce, 1 and A. G. K lein 2 1 CNRS, Sup ´ el ´ ec,...

Ngày tải lên: 22/06/2014, 00:20

Ngày tải lên: 22/06/2014, 15:19

Ngày tải lên: 19/07/2014, 12:19

Ngày tải lên: 07/08/2014, 06:20

... the super -orthogonal block codes, namely, super -orthogonal space-time trellis-coded OFDM and super -orthogonal space -frequency trellis-coded OFDM. The simulation results reveal that super -orthogonal ... used to enhance the performance of space-time codes in frequency selective fading channels are the following: (i) orthogonal frequency division multiplexing, that is, multipath-induced intersymbol ... properly cited. Super -orthogonal block codes in space-time domain (i.e., Super -orthogonal space-time trellis codes (SOSTTCs)) were initially designed for frequency nonselective (FNS) channels but in frequency...

Ngày tải lên: 21/06/2014, 17:20

... thiết lập một sự kiện của một vài kiểu nào đó. Việc xử lý những sự kiện này phụ thuộc vào ứng dụng. Abstract Windowing Toolkit (AWT) xử lý một vài sự kiện. Môi trường mà các ứng dụng này được thi...

Ngày tải lên: 22/08/2012, 10:13

... Addison-Wesley Procedural Abstraction and C++  Procedural Abstraction is writing and using functions as if they were black boxes  Procedure is a general term meaning a “function like” set of instructions  Abstraction ... in spite of a logical error in the code  Remember the integer division problem? If there is no fractional remainder, integer division will give apparently correct results Slide 4- 19 Copyright ... like” set of instructions  Abstraction implies that when you use a function as a black box, you abstract away the details of the code in the function body Slide 4- 22 Copyright â 2007 Pearson...

Ngày tải lên: 12/09/2012, 22:48

... coding ã Frequency Shift Keying (FSK) Binary modulation technique that changes the frequency of the carrier signal – More wave cycles are needed to represent a 1 bit 24 Frequency (continued) 26 Frequency ... 14 Infrared Light (continued) 25 Frequency (continued) ã A change in voltage does not create a change in frequency ã The term Hertz (Hz) is used to measure frequency A Kilohertz (KHz) is 1,000 ... (AM) Used by broadcast radio stations Very susceptible to interference from outside sources ã Frequency modulation (FM) Number of waves that occur in one second change ã Based on the amplitude...

Ngày tải lên: 13/09/2012, 10:52

... TDM TDM Ghép kênh - Multiplexing Multiplexing Frequency- Division Multiplexing (FDM) Time -Division Multiplexing (TDM) Synchronous Asynchronous Dữ liệu hỗn ... theo cho thuê bao. Các bytes đầu của SONET STS-1 Wavelength Division Multiplexing TDM FDM Ghép kênhtheo tần số Frequency Division Multiplexing (FDM)  FDM  Phương pháp này chỉ hiện thực được ... Dense Wavelength Division Multiplexing  DWDM  Chưa có định nghĩa chính thức (chưa chuẩn hóa)  Các kênh sít nhau hơn WDM  200GHz FDM của 3 kênh thoại (tiếp) Wavelength Division Multiplexing  WDM...

Ngày tải lên: 13/09/2012, 11:16

Ngày tải lên: 02/03/2013, 16:59

Ngày tải lên: 19/03/2013, 09:41