wideband code division multiple access wcdma or 3gsm handset
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. ... source
coding and channel error-correcting coding) and the corresponding signal pro-
cessing techniques at the receiver.
1.2 FREQUENCY DIVISION AND TIME DIVISION
MULTIPLE ACCESS
Multiple access schemes are ... COMMUNICATION
Spreader 2
Impulse
generator 2
Channel
Spreader
K
Impulse
generator
K
Spreader 1
{
u
(1)
}
n
Impulse
generator 1
Modulator 1
Modulator 2
Modulator
K
Encoder 1
Encoder 2
Encoder
K
. . . .
{
u
(2)
}
{
u
(
K
)
{
v
(1)
}
n
{
v
(2)
}
n
{
v
(1)
n
{
a
(1)
}
n
{
a
(2)
}
n
{
a
(
K
)
}
}
}
}
n
a
(1)
s
(1)
(
t
)
s
(1)
(
t
)
s
(
K
)
(
t
)
}
n
{
v
(2)
n
a
(2)
}
n
{
v
(
K
)
n
{
v
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)
n
a
(
K
)
Figure...
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Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond
Ngày tải lên :
02/03/2013, 16:59
... Europe
RACH Random Access CHannel (GSM, UTRA transport channel)
RAMA Resource Auction Multiple Access
RAN Radio Access Network
RAP Random Access Protocol
RCMA Reservation -Code Multiple Access
RES Reservation ... to assign 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, ... mode)
NWL Network Layer
O
ODMA Opportunity Driven Multiple Access
OFDM Orthogonal Frequency -Division Multiplexing
OSI Open Systems Interconnection
OVSF Orthogonal Variable Spreading Factor (UMTS)
P
P-CCPCH...
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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
... users in the internetwork cannot forward these documents, do not
allow any computers telnet nor FTP access to the Internet.
Will new access control list(s) be created or will the current list(s) ... 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.
_____________________________________________________________________________________ ...
Inbound access list is ________
Interface __________
Outgoing access list is ________
Inbound access list is ________
Interface __________
Outgoing access list is ________
Inbound access...
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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 ...
bands.
Note
12.6
Figure 12.4 Procedure for pure ALOHA 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 ... Permission required for reproduction or display.
12.25
A network using CSMA/CD has a bandwidth of 10 Mbps.
If the maximum propagation time (including the delays in
the devices and ignoring the time...
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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
... the transmission
performance for high communication SNR, but it causes more errors for low SNR. For the transmission
schemes using CRC, the BER is even worse b e caus e long codes will reduce the ... suboptimal decentralized estimators in wireless sensor networks over orthogonal multiple-
access fading channels in this paper. Considering multiple- bit quantization for digital transmission, we ... Sensor Networks. Lecture Notes in Com-
puter Science, vol. 2634, (2003), p p. 162–177
17. M Gastpar, Uncoded transmission is exactly optimal for a simple Gaussian “sensor” network. in 2007
Information...
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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
... the transmission
performance for high communication SNR, but it causes more errors for low SNR. For the transmission
schemes using CRC, the BER is even worse b e caus e long codes will reduce the ... modulati on for all codebooks. Because the code
length of the uncoded transmission is shorter than that of the coded transmission, the energy to transmit
each symbol will be higher for a given ... the redundant observations provided by multiple sensor s . However, their
performance degrades dramatically when communication errors cannot be ignored or corrected. On the other
hand, various...
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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
... statistics in the decoded information from the
sensors allow for the concatenation of BCH codes [39, 40]in
order to decrease the aforementioned intrinsic error floor of
single LDGM codes. Extensive ... reduce
the error floor inherent to LDGM codes. Inspired by this
previous work, in this paper we take a step further by
analyzing the performance of concatenated BCH-LDGM
codes for encoded data fusion ... errors per
decoded block λ motivates the inclusion of an outer sys-
tematic BCH code whose error correction capability t is
adjusted so as to correct the residual errors obtained in the
error...
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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
... interference on multiple
access networks, we propose an analytical framework to
characterize partial interference for two representative types
of multiple access wireless networks, namely, the ... the original work is properly cited.
To determine the capacity of wireless multiple access networks, the interference among the wireless links must be accurately modeled.
In this paper, we formalize ... with each other, resulting
in performance degradation. Therefore in the study of
wireless networks, one important performance measure is
the capacity of the network when the effects of interlink
interference...
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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
... of LDGM codes permits to efficiently exploit the intrinsic
spatial correlation between the information registered by the sensors,
whereas BCH codes are selected to lower the error floor due ... Diversity and Transmit
Beamforming” by Di Zheng and Yu-Dong Yao presents a theoretical
contribution for the study of classical Slotted ALOHA random access
algorithm for multi -access- point diversity ... Networking 2012,
2012:45 doi:10.1186/1687-1499-2012-45
Norman Abramson (norm@alohanet.com)
Claudio Sacchi (sacchi@disi.unitn.it)
Boris Bellalta (boris.bellalta@upf.edu)
Alexey Vinel (vinel@ieee.org)
ISSN...
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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
corresponding capacity with L-order receive diversity.
4. CAPACITY ANALYSIS OF A TIME-HOPPING
MULTIPLE ACCESS PPM OR PAM UWB SYSTEM
With more than one user active in the system, multiaccess
interference ... of
the multiple- access interference (MAI) [10]. However, for
simplicity, an M-ary correlation receiver is typically used
even when there is more than one active user. For PAM,
only one correlation ... one
user is present, the optimal receiver for PPM is a bank of M
correlation receivers followed by a detector. When more than
one link is active in the multiple- access system, the optimal
PPM receiver...
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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
... that the frame is bit-
interleaved prior to the FHSS transmission in order to spread
burst errors in the decoder.
We consider a multiple- access FHSS network of K users.
The frequency band is ... practical for short-delay applications
because the performance is not affected significantly by the
frame size.
In cellular networks, multiple access interference (MAI)
may arise when more than one ... codeword given that the all-
zero codeword is transmitted. In (6), w
d
is the number of
codewordswithoutputweightd obtained from the weight
enumerator of the code [12].
In FHSS systems, the PEP...
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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
... [5] for multiple- access
channels. We will give an achievable rate region for all five
side information cases listed in Section 2.4.Twomaincode
constructions are used, namely in Theorem 1 for Case ... a multiple- access system,” IEEE Transactions on
Information Theory, vol. 34, no. 5, pp. 918–930, 1988.
[5] T.M.CoverandJ.A.Thomas,Elements of Information Theory,
John Wiley & Sons, New York, ... 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 with i.i.d....
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