IJARES/Aug 2013/Volume-1/Issuse-1/Article No-1/1-7
INTERNATIONAL JOURNAL OF ADVANCED RESEARCH IN
ENGINEERING AND SCIENCE
AN ADVANCE TOWARDS CONSEQUENCES ON TOPOLOGY
CONTROL AND NETWORK CAPACITY IN AD HOC NETWORKS
K.Vinayak1, L.Kiran2
1
Dept of ECE, SV Engineering College, Hyderabad, A.P, India
2
Dept of ECE, SV Engineering College, Hyderabad, A.P, India
ABSTRACT:
Due to several limitations, a wireless mobile device cannot maintain multiple transmit antennas, hence
cooperative communications was proved as a novel aspect which supports multiple antenna systems. The
system which supports the sharing and communication of various resources by the users and also
improves the superiority of the data transmission is known as cooperative communication. Over
conventional wireless networks that go ahead by means of simply making available a more consistent
physical layer link, numerous benefits were offered by cooperation in terms of flexibility. For the
purpose of reducing the energy consumption and interference, the topology control was initialized for
sensor networks and mesh networks. To reduce the utmost transmission power and the necessary channels
numeral, interference free associations are initiated forming the objective of the topology control. A
minute nodal degree along with small transmission radius having superior quality links and minute
controversy is the resultant of topology control which results in a simple network topology. By means of
link data provided through MAC and physical layers, topology control is centered on network
connectivity. To enhance the network capability in MANET all the way through mutual optimization of
selection of transmission mode, relay node and controlling of MANET by means of cooperative
communications, the concept of capacity optimized cooperative topology control was initiated and it
lengthens the physical layer cooperative communications by means of believing the undeviating,
cooperative and multi-hop transmission from the link-level towards the network-level perception.
Network connectivity and path length are the limit circumstances which should to be taken into concern.
KEYWORDS: Cooperative Communication, Wireless Networks, Topology Control, MANET.
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1. INTRODUCTION:
a number of relay nodes. Permitting to share
The system which supports the sharing and
the antennas of single antenna radios for the
communication of various resources by the
formation of a virtual antenna array,
users and also improves the superiority of
cooperative communication put forward
the
as
about the improvement of the performance.
cooperative communication. Due to several
From the source node and relay nodes, the
limitations a wireless mobile device cannot
destination
maintain multiple transmit antennas, hence
autonomously
cooperative communications was proved as
transmitted data and hence the cooperative
a novel aspect which supports multiple
diversity is attained [10]. Most of the active
antenna systems [3]. Recent works on
works of cooperative communications were
wireless
the
performed on various concerns regarding
generation modification and supervising on
outage possibility and outage competence.
a point to point non-cooperative network
In the recent times research studies make
links. Numerous networking problems were
known
made lessen and formation of simple
communications
network consisting of more complex links to
combined working of single antenna devices
a certain extent than more complex networks
for making the most of the spatial diversity
made of simple links were made possible by
[2]. Few nodes overheard the transmitted
cooperation [8]. The effect of cooperative
data and transmit to the destination node
communications was made ignored on
from the source node is the general thought
numerous upper layers concerns of network
of cooperative relaying and can be put into
level such as controlling of topology. Over
operation by making usage of Amplify-and-
conventional wireless networks that go
forward where the energy of the signal
ahead by means of simply making available
obtained from the sender is enhanced by the
a more consistent physical layer link,
relay nodes and retransmits to the receiver
numerous
by
as well as Decode-and-forward process
cooperation in terms of flexibility [11] [1].
where the decoding of physical layer was
Cooperative wireless network containing
carried out by the relay nodes and later on
data
transmission
networks
benefits
is
known
challenges
were
for
offered
node
accepts
faded
about
copies
the
that
the
they
various
of
the
cooperative
permit
the
two hops presents a source, destination, and
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IJARES/Aug 2013/Volume-1/Issuse-1/Article No-1/1-7
forwards the result of decoding to the
and physical layers, topology control is
destinations [5] [9].
centered on network connectivity. A mobile
node can lack the extent of making network
2. CONTROLLING OF TOPOLOGY IN
wide assessment and make extra logic to
MANET:
perform controlling of power and channel
For the purpose of reducing the energy
through the topological perspective. As the
consumption and interference, the topology
network topology will outcome numerous
control was initialized for sensor networks
advantages for performance of networks, it
and mesh networks. A minute nodal degree
is also advantageous to set up a consistent
along with small transmission radius having
one [4] [7]. Several controllable elements
superior
determining the survival of wireless links
quality
links
and
minute
controversy is the resultant of topology
parameters
the
topology
control which results in a simple network
MANET. The lengthwise connectivity is
topology [13]. For the purpose of reducing
assured
the utmost transmission power and the
associations are maintained as a result of
necessary channels numeral, interference
managing of the links by each node to the
free associations are initiated forming the
entire neighbours. In classical MANETs, a
objective of the topology control. Network
link normally contains two nodes that are in
nodes and the association links connecting
the transmission series of each other [12].
them are the two elements considered in a
Designing
network topology. To find out the existence
requiring confined knowledge and executing
of wireless links subjected on the way to
it autonomously at every node makes
network connectivity is the aim of topology
desirable to gather the whole data in
control. Based on the mobility of the user,
MANET.
when
of
the
a
of
total
classical
neighbour
distributed
algorithm
traffic and etc the network topology in a
MANET shown in fig1 is altered through
3.
dynamism and is controllable by means of
CAPACITY
amending parameters
ENHANCING
BY
NETWORK
TOPOLOGY
for instance
the
CONTROL IN MANETS:
transmission power and so on [15].
By
To enhance the network capability in
means of link data provided through MAC
MANET all the way through mutual
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optimization of selection of transmission
hop
mode, relay node and controlling of
network connectivity and it can be preserved
MANET
cooperative
in the complete network only if the entire
communications, the concept of capacity
associations of neighbors are made sure. An
optimized cooperative topology control was
ideal load balance in the network was taken
initiated and it lengthens the physical layer
for granted where the uniform distribution of
cooperative communications by means of
the network loads to the nodes takes place in
believing the undeviating, cooperative and
the network. Numerous data packets were
multi-hop transmission from the link-level
imported into the network by means of a
towards the network-level perception [6].
lengthwise transmission. COCO confines
by
means
of
mode
guarantees
the
lengthwise
the breaking of a long link into moreover
numerous
hops
while
routing
mainly
determines the length of the path. Routing
moreover stabilize the traffic nodes for the
purpose of avoiding network hotspots and
helps in finding of paths in order to meet the
essential requirements of quality of service.
By means of merging of the maximal rate at
the destination the decoding of the signals of
the source and the relay takes place.
Cooperative communications generally do
Fig1: An overview of Mobile Ad Hoc Networks
not always do better than the undeviating
transmissions and to a certain extent
Network connectivity and path length are
the limit circumstances which should to be
taken into concern. Network connectivity,
forms the essential constraint in topology
control. The network can maximize the
capability
and
may
possibly
disclose
additional traffic flows by means of
information is transmitted by means of multi
hops in the situation when there is a lack of
relay making cooperative transmissions
consisting of outsized outrage capability
[14]. Generally relay node forward the
signal to the destination after the process of
decoding and re-encoding the signal from
balancing the traffic. Through the hop-bywww.ijares.com
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the source during the usage of cooperative
to LLISE, in the view of the fact that LLISE
transmission and the selection of most
merely think multihop transmissions.
excellent
relay
nodes
earlier
to
the
transmission.
5. CONCLUSION:
In the recent times research studies make
4. RESULTS:
known
We measure the performance of the COCO
communications
scheme with that of LLISE. It is an existing
combined working of single antenna devices
famous topology control method, maintains
for making the most
the smallest amount of interference path for
assortment. Over conventional wireless
each neighbour link locally taking into
networks that go ahead by means of simply
consideration only conventional multi-hop
making available a more consistent physical
transmissions
cooperative
layer link, numerous benefits were offered
communications. While comparing COCO,
by cooperation in terms of flexibility. For
LLISE conserve all the edges on the
the
smallest amount of interference path for
consumption and interference, the topology
every link in the ensuing topology, and
control was initialized for sensor networks
carried out in every node distributed and
and mesh networks.
consequently diminish the interference to
network capability in MANET all the way
get better network capacity. From the joint
through mutual optimization of selection of
aim of transmission mode, relay node
transmission
selection, and minimization of interference
controlling of MANET by means of
in MANETs by means of cooperative
cooperative communications, the concept of
communications, the performance growth of
capacity optimized cooperative topology
the proposed system move towards. In spite
control was initiated. While comparing
of the number of nodes in the network,
COCO, LLISE conserve all the edges on the
COCO system has the uppermost network
smallest amount of interference path for
capacity and can be able to gain much
every link in the ensuing topology, and
superior network capability when compared
carried out in every node distributed and
lacking
about
purpose
of
the
that
cooperative
they
of
reducing
mode,
permit
the
the spatial
the
energy
To enhance the
relay
node
and
consequently diminish the interference to
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IJARES/Aug 2013/Volume-1/Issuse-1/Article No-1/1-7
get better network capacity. . In spite of the
[5] J. N. Laneman, G. W. Wornell, and D. N. C. Tse,
number of nodes in the network, COCO
\An E±cient Protocol for Realizing Cooperative
system has the uppermost network capacity
Diversity in Wireless Networks," in Proc. IEEE Int.
Symp. Information Theory (ISIT), Washington, DC,
and can be able to gain much superior
June 2001. [Online]. Available:
network capability when compared to
http://www.nd.edu/ jnl/pubs/isit2001.pdf
LLISE, in the view of the fact that LLISE
[6] Sirkeci-Mergen B.; Scaglione A. "Message
merely think multihop transmissions.
Propagation
in
a
Cooperative
Network
with
Asynchronous Receptions", ICASSP 2005, March
REFERENCES:
19-23, Philadelphia, PA.
[1] P. Gupta and P. R. Kumar, \Critical power for
asymptotic connectivity in wireless
networks,"
Stochastic Analysis, Control, and Optimization and
Applications: A Volume in Honor of W. H. Fleming,
1998, edited by W.M. McEneany, G. Yin, and Q.
[7] Y.-C. Tseng, S.-Y. Ni, Y.-S. Chen, and J.-P.
Sheu, \The broadcast storm problem in a mobile ad
hoc network," ACM Wireless Networks, vol. 8, pp.
153{167, Mar. 2002.
Zhang, Birkhauser.
[8] A. Host-Madsen, \A new achievable rate for
[2] Y. Hua, Y. Mei, and Y. Chang, \Wirelessantennas making wireless communications perform
like wireline communications," in IEEE AP-S
cooperative diversity based on generalized
writing on dirty paper", Proc. of ISIT, June 2003, pp.
317.
Topical Conference on Wireless Communication
[9] R. Nabar, H. Bolcskei, and V. Morgenshtern,, \On
Technology, 2003.
the Robustness of Distributed Orthgonalization in
[3] P. Gupta and P. R. Kumar, \Critical power for
asymptotic connectivity in wireless
networks,"
Dense Wireless Networks", submitted to IEEE Tran.
Inform. Theory,March 2005.
Stochastic Analysis, Control, and Optimization and
Applications: A Volume in Honor of W. H. Fleming,
1998, edited by W.M. McEneany, G. Yin, and Q.
[10] A. Sendonaris, \Advanced Techniques for NextGeneration Wireless Systems," Ph.D.
dissertation, Rice University, Houston, TX, Aug.
Zhang, Birkhauser.
1999.
[4] I. Maric and R. Yates, \E±cient Multihop
Broadcast for Wideband Systems", IEEE JSAC,
Special Issue on Fundamental Performance Limits of
Wireless Sensor Networks, Vol. 22, No. 6, Aug. 2004
[11] W. Heinzelman, A. Chandrakasan, and H.
Balakrishnan,
"Energy-E±cient
Communication
Protocols for Wireless Microsensor Networks," in
Proc. of the Hawaii Int. Conf. on System Sciences,
Maui, HW, Jan. 2000, pp. 3005-3014.
www.ijares.com
6|Page
IJARES/Aug 2013/Volume-1/Issuse-1/Article No-1/1-7
[12] K. Woradit et al., “Outage Behavior of Selective
Relaying Schemes,” IEEE Trans. Wireless Commun.,
vol. 8, no. 8, 2009, pp. 3890–95.
[13] Q. Guan et al., “Impact of Topology Control on
Capacity of Wireless Ad Hoc Networks,” Proc. IEEE
ICCS, Guangzhou, P. R. China, Nov. 2008.
[14] Q. Guan et al., “Capacity-Optimized Topology
Control
for
MANETs
with
Cooperative
Communications,” IEEE Trans. Wireless Commun.,
vol. 10, July 2011, pp. 2162–70.
[15] P. A. Anghel, G. Leus, and M. Kaveh,
\Distributed
space-time
coding
in
cooperative
networks," in Proc. of 5th NORDIC signal processing
symposium, 2002.
www.ijares.com
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