Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx
Multi-Carrier Digital Communications - Theory and Applications of OFDM
... Polytechnic Institute and State University
Blacksburg, Virginia
Multi-Carrier Digital Communications: Theory and Applications of OFDM
Ahmad R. S. Bahai and Burton R. Saltzberg
Principles of Digital Transmission: ... requirement of an equalizer in a typical single carrier
implementation for wireline applications.
Multi-Carrier
Digital Communications
Theory...
Tài liệu Obesity guidance on the prevention, identification, assessment and management of overweight and obesity in adults and children ppt
... catering (including vending machines) and
the food and drink children bring into school, the taught curriculum
(including PE), school travel plans and provision for cycling, and policies
relating ...
Section 3 on pages 59 and 60 has links to tools to help with implementing the
recommendations, meeting training needs, evaluating the impact of action and
working...
Obesity guidance on the prevention, identification, assessment and management of overweight and obesity in adults and children docx
... evidence of
effectiveness, including cost effectiveness. They include recommendations on
the clinical management of overweight and obesity in the NHS, and advice on
the prevention of overweight and ... overweight and obesity in adults and children in England
and Wales. The guidance aims to:
ã stem the rising prevalence of obesity...
Multi-Carrier Digital Communications Theory and Applications of OFDM pdf
... symbols to OFDM symbols
such that
The linear mapping can be represented in matrix form as:
17
Multi-Carrier
Digital Communications
Theory and Applications of OFDM
Ahmad R. S. Bahai and
Burton ... TECHNIQUES
FOR
WIRELESS
LAN
OFDM
FOR
W
IRELESS
LAN
RECEIVER
STRUCTURE
175
181
182
187
Multi-Carrier
Digital Communications
Theory and Applications of...
Theory and applications of ofdm and cdma wideband wireless communications phần 1 ppsx
... BibliographicalNotes 14 2
3.5 Problems 14 3
4 OFDM 14 5
4 .1 GeneralPrinciples 14 5
4 .1. 1 Theconceptofmulticarriertransmission 14 5
4 .1. 2 OFDMasmulticarriertransmission 14 9
4 .1. 3 ImplementationbyFFT 15 3
4 .1. 4 OFDMwithguardinterval ... by the signal
s(t) =
K
k =1
s
k
g
k
(t). (1. 17)
Theory and Applications of
OFDM and CDMA
Wideband Wireless Communica...
Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt
... gain
|
c(t)
|
2
of the channel can be calculated as
|
c(t)
|
2
= a
2
1
+ a
2
2
+ 2a
1
a
2
cos
(
2
(
ν
1
− ν
2
)
t +θ
1
− θ
2
)
.
Figure 2. 4 shows
|
c(t)
|
2
for a
1
= 0.75 and a
2
=
√
7/4. The ... gain
|
H(f)
|
2
of the channel can be
calculated as
|
H(f)
|
2
= a
2
1
+ a
2
2
+ 2a
1
a
2
cos
(
2 f
(
τ
1
− τ
2
)
+ θ
2
− θ
1
)
.
The picture is similar to...
Theory and applications of ofdm and cdma wideband wireless communications phần 3 ppt
... is often convenient to work with code words of
finite length, but it is not necessary, and the length is not determined by the code.
Theory and Applications of OFDM and CDMA Henrik Schulze and ... modulo 2 addition of more than two
random bits and write
L ≈
K
i=1
sign
(
L
i
)
· min
(
|
L
1
|
, ,
|
L
K
|
)
. (3. 14)
3
Channel Coding
3. 1 General Principles
3. 1.1...
Theory and applications of ofdm and cdma wideband wireless communications phần 4 ppt
... 0, 1, 2, 3, 4, 5, 6 is defined by the addition table
+ 12 345 6
1 2 345 60
2 345 601
3 45 6012
4 560123
5 6012 34
6 012 345
and the multiplication table
12 345 6
246 135
3625 14
415263
531 642
6 543 21
Note that ... duration that is matched to the channel and parallelize the given data stream
in an appropriate way.
Theory and Applications of OFDM and CDMA Henrik Schul...
Theory and applications of ofdm and cdma wideband wireless communications phần 5 ppsx
... 162 OFDM
0 50 100 150 200 250 300 350 400 450 50 0
50
–40
–30
–20
(a)
(
b
)
–10
0
10
Normalized frequency fT
Power spectrum (linear)
0 50 100 150 200 250 300 350 400 450 50 0
50
–40
–30
–20
–10
0
10
Normalized ... (b) and the
amplitude (c) of an OFDM signal of average power one.
–3 –2 .5 –2 –1 .5 –1 –0 .5 0 0 .5 1 1 .5 2
0.001
0.003
0.01
0.02
0. 05
0.10
0. 25
0 .50
0...
Theory and applications of ofdm and cdma wideband wireless communications phần 6 pot
... 2
K = 15 36, L = 80
OFDM with 16- QAM and R
c
= 0.5
CE ideal
CE real
Figure 4 .67 Simulation of a wideband OFDM system with 16- QAM for a moderately fast
and frequency nonselective channel.
OFDM 241
0 ... function of E
b
/N
0
for such a channel and 16- QAM
transmission with code rate R
c
= 1/2 and a huge time and frequency interleaving over the
bandwidth of K = 768 ca...
Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx
... multiplication of the data symbols by a spreading sequence of pseudoran-
dom signs. These sequences are called pseudonoise (PN) sequences or code signals. We
Theory and Applications of OFDM and CDMA Henrik ... definition of wideband is the same as that introduced in Chapter 4 for OFDM. Furthermore,
it should not be confused with one transmission mode of UMTS, which is...
Theory and applications of ofdm and cdma wideband wireless communications phần 8 pot
... number of base stations involved in a soft handover
should be kept small. To illustrate this soft handover effort, Figure 5.23 shows the fraction
of connections involved in a soft (or softer) handover ... difference of the local mean levels of both signals has been set to
0, 3and6 dB.
In Figure 5.22, the corresponding probability functions of the signal levels with and
without sof...
Theory and applications of ofdm and cdma wideband wireless communications phần 9 pot
... Subsection 4.6.3 – use OFDM to handle data rates of up to 54 Mbit/s.
More details on the IEEE 802.11 standard can be found, for example, in (O’Hara and
Petrick 199 9).
350 CDMA
Since
v
l
= h
†
l
r ... using
pure CDMA and a time division duplex (TDD) mode using a combination of CDMA and
TDMA as the multiple access scheme. The FDD mode is based on a proposal originally
called...
Theory and applications of ofdm and cdma wideband wireless communications phần 10 docx
... INDEX
Nyquist
base, 9
criterion, 10
pulse, 9
OFDM, 1, 145
OFDM
and nonlinearities, 166
symbol, 159
OFDM with convolutional coding, 208,
213
OFDM with QAM, 213
OFDM with QPSK, 208
Omni cell, 270
Open-loop ... 384, 391
Channel coding, 93, 245
Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L
ă
uders
2005 John Wiley & Sons, Ltd
Channel codi...
An investigation into Viet Bac High school 11th grade students and teachers' attitudes towards the applications of pairwork and groupwork in teaching and learni
... is the reality of teaching and learning speaking skill in Viet Bac high
school? What are the attitudes of students and teachers towards pair and group work in a
speaking lesson there? Whether ... the attitudes of teachers and 11
th
grade students at Viet Bac
high school towards the application of pair and groupwork in teachin...
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