orthogonal frequency division multiplexing abstract
Báo cáo hóa học: " High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems" pptx
Ngày tải lên :
22/06/2014, 22:20
... 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,...
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Orthogonal Frequency Division Multiplexing - Phân chia tần số trực giao potx
Ngày tải lên :
11/07/2014, 20:21
... 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...
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Digital Television Techniquies Coded Orthogonal Frequency Division
Ngày tải lên :
09/07/2014, 08:16
... 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...
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Tài liệu Coarse Wavelength Division Multiplexing (CWDM) docx
Ngày tải lên :
21/12/2013, 07:17
... Coarse Wavelength Division Multiplexing (CWDM)
Generate More Revenue with Less Fiber
Here's How it Works
In simple ... MDU/
BUSINESS
Satellite
Uplink
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The CWDM Advantage
ADC Coarse Wave Division Multiplexing (CWDM) Solutions, part of the ADC’s Value-Added Module
(VAM) family, add flexibility...
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Tài liệu ADC Coarse Wavelength Division Multiplexing (CWDM) docx
Ngày tải lên :
17/01/2014, 11:20
... 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...
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Báo cáo hóa học: "Research Article Block Interleaved Frequency Division " ppt
Ngày tải lên :
21/06/2014, 22:20
... 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...
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Báo cáo hóa học: " Research Article Practical Quantize-and-Forward Schemes for the Frequency Division Relay Channel" potx
Ngày tải lên :
22/06/2014, 00:20
... 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,...
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Báo cáo hóa học: " Research Article Super-Orthogonal Block Codes with Multichannel Equalisation and OFDM in Frequency Selective Fading" pdf
Ngày tải lên :
21/06/2014, 17:20
... 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...
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Giới thiệu về AWT Abstract Windowing Toolkit
Ngày tải lên :
22/08/2012, 10:13
... 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...
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Procedural Abstraction and Functions That Return a Value
Ngày tải lên :
12/09/2012, 22:48
... 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...
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Define Radio Frequency Identification (RFID)
Ngày tải lên :
13/09/2012, 10:52
... 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...
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GHÉP KÊNH MULTIPLEXING
Ngày tải lên :
13/09/2012, 11:16
... 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...
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