wideband code division multiple access คือ
theory of code division muitiple access communication
Ngày tải lên :
01/06/2014, 11:27
... transmission.
THEORY OF
CODE DIVISION
MULTIPLE ACCESS
COMMUNICATION
1
INTRODUCTION TO CELLULAR
MOBILE RADIO COMMUNICATION
The subject of this book is code division multiple access (CDMA) communi-
cations. ... during
Theory of Code Division Multiple Access Communication, by Kamil Sh. Zigangirov
ISBN 0-471-45712-4 Copyright 2004 Institute of Electrical and Electronics Engineers
1
THEORY OF
CODE DIVISION
MULTIPLE ... actually consists of two simplex channels.
Frequency division multiple access (FDMA) and time division multiple access
(TDMA) are the two major access techniques used to share the available band-
width...
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Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond
Ngày tải lên :
02/03/2013, 16:59
... Standards 46
2.6 Summary 48
3 Multiple Access in Cellular Communication Systems 49
3.1 Multiple Access and the OSI Layers 49
3.2 Basic Multiple Access Schemes 53
3.3 Medium Access Control in 2G Cellular ... individual portions of
its resources to support multiple communications, basic multiple access techniques (such
as frequency-, time-, or code- division multiple access, with FDMA, TDMA, and CDMA
as their ... with multiple access protocols,which
govern access to these resources. The basic multiple access schemes are briefly described
further below in this section, and the importance of the multiple access...
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Tài liệu Lab 11.2.3d Multiple Access Lists Functions (Challenge Lab) pdf
Ngày tải lên :
18/01/2014, 05:20
...
Outgoing access list is ________
Inbound access list is ________
Interface __________
Outgoing access list is ________
Inbound access list is ________
Interface __________
Outgoing access ... Verify the Access Lists
a. Now that the access lists have been applied, they need to be verified.
First, verify what lists have been defined. From a CLI session on one of the routers with access ... of the routers with access
lists, display the access lists with the Boaz#show ip access- lists command. Record the
information about one of the access lists.
_____________________________________________________________________________________...
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Tài liệu Chapter 12 Multiple Access docx
Ngày tải lên :
16/02/2014, 20:20
... polling access method
12.40
Figure 12.22 Time -division multiple access (TDMA)
12.35
Figure 12.20 Logical ring and physical topology in token-passing access method
12.1
Chapter 12
Multiple Access
Copyright ... protocol
12.24
Figure 12.13 Collision and abortion in CSMA/CD
12.38
Figure 12.21 Frequency -division multiple access (FDMA)
12.29
In CSMA/CA, the IFS can also be used to
define the priority of a station ... rule and examples of creating Walsh tables
12.43
Figure 12.23 Simple idea of communication with code
12.10
A pure ALOHA network transmits 200-bit frames on a
shared channel of 200 kbps. What...
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Báo cáo sinh học: " Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" pot
Ngày tải lên :
18/06/2014, 22:20
... cyclic redundancy check (CRC) codes with generation polynomial
G(x) = x
4
+x+1, as an example of the coded transmission. The codebook is denoted as C
tc
. For comparison,
uncoded transmission is also ... various codes such as natural binary codes to represent the quantized observations.
In this paper, our focus is to design decentralized estimators; therefore, we will not address the transmission
codebook ... estimation for a deterministic parameter using digital communications
over orthogonal multiple- access fading channels with a multiple- bit quantizer. By introducing a general
messaging function, the proposed...
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báo cáo hóa học:" Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" ppt
Ngày tải lên :
20/06/2014, 04:20
... (2008)
28
which codebook is denoted as C
tn
. We consider BPSK modulati on for all codebooks. Because the code
length of the uncoded transmission is shorter than that of the coded transmission, ... cyclic redundancy check (CRC) codes with generation polynomial
G(x) = x
4
+x+1, as an example of the coded transmission. The codebook is denoted as C
tc
. For comparison,
uncoded transmission is also ... for example, when the natural binary
code and BPSK are applied to r e pr e s ent each quantized observation and to modulate. For any c
m
in such
a transmission codebook, defined as C
tn
, there exists...
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Báo cáo hóa học: " Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes" potx
Ngày tải lên :
21/06/2014, 07:20
... the minimum distance of the BCH code. ). The
encoded sequence at the output of the BCH encoder is
next processed through an inner LDGM code, that is, a
linear code with low density generator matrix ... coding
of correlated senders over multiple access channels,” in
Proceedings of the Allerton Conference on Communication,
Control, and Computing, 2004.
[39] A. Hocquenghem, “Codes correcteurs d’erreurs,” ... sequence
{x
n
k
}
K
k
=1
to
codeword
{c
n
l
}
L
l
=1
through the LDGM parit y check matr ix H
and the BCH code (to be later detailed), and the relationship
between the received sequence
{y
l
}
L
l
=1
and the N codewords
{c
n
l
}
L
l
=1
,withn...
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Báo cáo hóa học: " Research Article Partial Interference and Its Performance Impact on Wireless Multiple Access Networks" potx
Ngày tải lên :
21/06/2014, 11:20
... analyzing the performance
of wireless multiple access protocols.
8. Conclusion
In this paper, we have introduced the notion of partial inter-
ference in wireless multiple access systems and illustrated
the ... impact of interference on multiple
access networks, we propose an analytical framework to
characterize partial interference for two representative types
of multiple access wireless networks, ... demonstrate
that it is important to model the partial interference effects
while analyzing wireless multiple access networks. This is
because such considerations can result in not only significant
quantitative...
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báo cáo hóa học:" Multiple access communications in future-generation wireless networks" potx
Ngày tải lên :
21/06/2014, 17:20
... article “Polarization Division Multiple Access With Polarization
Modulation for LOS Wireless Communications” by Bin Cao, Qin-Yu Zhang,
and Lin Jin discusses a potential multiple access and modulation ... frequency offset (CFO) estimation in the uplink of multiuser multiple-
input multiple- output (MIMO) orthogonal frequency division multiplexing
(OFDM) systems. Conventional maximum likelihood ... in Multiple Access Communications such as new
cooperative MAC protocols; spectrum sharing, and channel assignment
techniques for cognitive radio networks; new results on PHY layer multiple
access...
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Báo cáo hóa học: " Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels" ppt
Ngày tải lên :
21/06/2014, 22:20
... the capacity analysis given
in Section 3 for a single user to be extended to a multiple-
access system.
4.1. Multiple- access interference model
Asgivenin(4), the received signal is modeled as
r(t)
=
K
k=1
L
l=1
a
lk
(t)X
(k)
l
t ... active in the multiple- access system, the optimal
PPM receiver has a complex structure that takes advantage
of all receiver knowledge regarding the characteristics of
the multiple- access interference ... Capacity of a multiple access UWB system with PAM over
a multipath fading channel with L
= 4, m = 0.65, K = 200, G =
100, and P
x
=−11 dBm.
The instantaneous capacity for a multiple access UWB
system...
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Báo cáo hóa học: " Research Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels" ppt
Ngày tải lên :
21/06/2014, 23:20
... the code, and
P
e
(d) is the PEP defined as the probability of decoding a
received sequence as a weight-d codeword given that the all-
zero codeword is transmitted. In (6), w
d
is the number of
codewordswithoutputweightd ... spread-spectrum multiple- access
communications over fading channels,” IEEE Transactions on
Communications, vol. 30, no. 5, part 2, pp. 996–1009, 1982.
[3] G. Einarsson, “Coding for a multiple- access frequency-
hopping ... distance of the code. The resultant code rate
after puncturing is given by
R
c
=
mR
c
m −1
. (34)
Ta bl e 1 shows the code rates and the minimum distances
of the punctured codes for different...
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Báo cáo hóa học: " Research Article Slotted Gaussian Multiple Access Channel: Stable Throughput Region and Role of Side Information" pdf
Ngày tải lên :
21/06/2014, 23:20
... regarding the
traffic on the stability performance of Gaussian multiple-
access channels.
We will focus our attention on a slotted Gaussian
multiple- access channel with K users sending bursty data to
a ... to the encoder at
transmitter i can have any bit-sequence of length nγ
i
. These
are encoded to 2
nγ
i
codewords of length n (sincewedonot
know the whole statistical information,we encode only ... ensemble of i.i.d. random codes.
Specifically, each user generates a codebook
C
(i)
containing
2
nR
i
.
= SNR
r
i
n
i
codewords denoted as X
(i)
1
, , X
(i)
SNR
r
i
n
i
.Each
codeword is n-length vector...
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Báo cáo hóa học: " Research Article Power and Resource Allocation for Orthogonal Multiple Access Relay Systems" pptx
Ngày tải lên :
22/06/2014, 01:20
... strategies.
(i) Regenerative decode-and-forward (RDF). The relay
decodes the message w
i
, re-encodes it using the same code
book as the source node, and transmits the codeword to the
destination ... Nonregenerative decode-and-forward (NDF). The
relay decodes the message w
i
, re-encodes it using a different
code book from that used by the source node, and transmits
the codeword to the destination ... allocation for orthogonal multiple access relay (MAR) systems in order
to maximize the achievable rate region. Four relaying strategies are considered; namely, regenerative decode-and-forward (RDF),
nonregenerative...
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