space division multiple access
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 ... 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 ... 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...
- 478
- 664
- 0
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.
_____________________________________________________________________________________...
- 8
- 355
- 0
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...
- 54
- 835
- 0
theory of code division muitiple access communication
Ngày tải lên :
01/06/2014, 11:27
... 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 ... 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 ACCESS
COMMUNICATION
Kamil ... corresponding signal pro-
cessing techniques at the receiver.
1.2 FREQUENCY DIVISION AND TIME DIVISION
MULTIPLE ACCESS
Multiple access schemes are used to allow many mobile users to share simultane-
ously...
- 412
- 505
- 0
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
... 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 ... decentralized estimators in wireless sensor networks over orthogonal multiple-
access fading channels in this paper. Considering multiple- bit quantization for digital transmission, we develop
maximum ... cate
that the separate source-channel coding scheme is optimal in fading channels with orthogonal multiple- access
protocols, which outperforms AF transmission, a simple joint source-channel coding scheme.
In...
- 35
- 298
- 0
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
... log-likelihood function. However, because the log-likelihood function shown in (11) is
non-concave and has multiple extrema, we need to find all its local maxima to get the global maximum.
Exhaustive searching ... therein). They reduce the
observation noise by exploiting the redundant observations provided by multiple sensor s . However, their
performance degrades dramatically when communication errors cannot ... diversity combining
reduces the bit error rate (BER), it requires that the signals transmitted from multiple sensors are identical,
which is not true in the context of WSNs due to the observation...
- 35
- 410
- 0
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
... 686–691.
[15] Z. Chair and P. K. Varshney, “Optimal data fusion in multiple
sensor detection systems,” IEEE Transactions on Aerospace and
Electronic Systems, vol. 22, no. 1, pp. 98–101, 1986.
[16] ... ’07),pp.
541–544, April 2007.
[24]W.LiandH.Dai,“Distributeddetectioninwirelesssensor
networks using a multiple access channel,” IEEE Transactions
on Signal Processing, vol. 55, no. 3, pp. 822–833, 2007.
[25] ... Zhao, W. Zhong, and J. Garcia-Frias, “Transmission of
correlated senders over a Rayleigh fading multiple access
channel,” Signal Processing, vol. 86, no. 11, pp. 3150–3159,
2006.
[37] W. Zhong, H....
- 12
- 275
- 0
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...
- 20
- 299
- 0
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...
- 17
- 306
- 0
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...
- 9
- 287
- 0
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
... 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 ... 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 divided into Q bands and users
transmit ... 346730, 9 pages
doi:10.1155/2008/346730
Research Article
Analysis of Coded FHSS Systems with Multiple Access
Interference over Generalized Fading Channels
Salam A. Zummo
Department of Electrical...
- 9
- 369
- 0
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 ... pp. 1073–
1096, 2003.
[9] D. N. C. Tse, P. Viswanath, and L. Zheng, “Diversity-
multiplexing tradeoff in multiple- access channels,” IEEE
Transactions on Information Theory, vol. 50, no. 9, pp. ... 2008, Article ID 695894, 11 pages
doi:10.1155/2008/695894
Research Article
Slotted Gaussian Multiple Access Channel:
Stable Throughput Region and Role of Side Information
Vaneet Aggarwal
1
and...
- 11
- 318
- 0
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
... Since ∇f ∈ R
2
, the subspace
orthogonal to
∇f will be a one-dimensional subspace. Since
the vector z
= [−f
x
, f
r
]
T
is orthogonal to ∇f , then all the
vectors in the subspace orthogonal to
∇f ... J. Wang
We study the problem of joint power and channel resource allocation for orthogonal multiple access relay (MAR) systems in order
to maximize the achievable rate region. Four relaying strategies ... reproduction in any medium, provided the original work is
properly cited.
1. INTRODUCTION
In multiple access relay (MAR) systems, several source nodes
send independent messages to a destination...
- 15
- 193
- 0
