performance analysis of lms based mimo relay communication
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PERFORMANCE ANALYSIS OF LMS BASED MIMO RELAY COMMUNICATION. Yamuna Dhungana Supervisor : Dr. R.M.A.P. Rajatheva May 16, 2011. Motivation. Goal of 4G wireless Network : to offer high data rate and high quality of service anytime, anywhere - PowerPoint PPT PresentationTRANSCRIPT
PERFORMANCE ANALYSIS OF LMS BASED MIMO RELAY COMMUNICATION
Yamuna Dhungana
Supervisor : Dr. R.M.A.P. Rajatheva
May 16, 2011
Motivation Goal of 4G wireless Network : to offer high data rate
and high quality of service anytime, anywhere Condition : Such network can cover any
geographical area by either using terrestrial network or satellite network
Solution : Integration of terrestrial and satellite networks into a hybrid architecture forming Hybrid Satellite/Terrestrial Network
This thesis proposes …
terrestrial relay node assisted cooperative communication approach towards Hybrid Satellite/ Terrestrial network
Satellite Communication voice, data, video and
networking services through large, expensive, high-power earth stations communicating via geostationary satellites
provides services through low earth-orbit (LEO) and medium earth orbit (MEO) satellites directly communicating with lower power mobile user terminals
Works like terrestrial cellular communication
Earth station (ES) Transmitter
Traditional satellite communication
Land mobile satellite (LMS) communication
Relay Assisted Cooperative communication
a collaborative communication in which a relay station helps to forward information between source and destination
Major Relay protocols– Amplify and Forward(AF)– Decode and Forward(DF)
S
R
D
Improves transmission reliability through diversity
Proposed System: Basic Model
Applies the concept of relay transmission to LMS communication
Implements through a terrestrial relay node forwarding information between satellite and land mobile user terminal
Develops a form of Hybrid Satellite/ Terrestrial Network
Demonstration of relaying concept in LMS communication
Advantages Brings satellite coverage indoor
or in tunnels
Link not available due to heavy shadowing
Can serve low cost user terminal with no satellite transmission/ reception capabilities
Serves as spatial diversity technique in mitigating the blockage effect in LMS channels
Support terrestrial networks unable to provide their services (e.g., because of lack of coverage, emergency situations, network overloads)
Proposed System: Enhanced Model The basic relaying concept in LMS communication is
enhanced through the incorporation of multiple antennas at all the three terminals.
Transmitter
.
.Receiver.
.
.
.
.
.
Single Antenna SystemMultiple input multiple output (MIMO) system
MIMO system offers
Enhanced throughput
Increased transmission
reliability MIMO relaying technology
• A new paradigm with tremendous potential• Already proposed as a next major extension of IEEE
802.16 WiMAX
Satellite Channel Model LMS communication suffers from strong variations
of the received signal power due to signal shadowing and multipath fading.
Signal shadowing by obstacles in the propagation path (e.g. buildings, trees, etc.) results into attenuation of the signal power over the entire bandwidth.
Proper modeling of such phenomena is important for performance evaluation.
In this thesis, LMS link is modeled with Shadowed Rician fading model which accounts for both line-of-sight (LOS) random shadowing and multipath fading.
System configurations proposed for implementationConfiguration I:
Source(S)
.
.
.Relay
(R)
.
.Destination
(D)
.
.
TransmitBeamforming
ReceiveBeamforming
Ns NrNd
Selected Antenna
HSR hRD
The configuration is analyzed Under both AF and DF relaying Considering both uncorrelated and correlated antennas
Configuration II:
OSTBCencoder
Fixed gain
AmplifierOSTBC decoder
.
.
.
.
.
.
.
.
.
.
.
.H1 H2
Satellite(S)
Terrestrial Relay node(R)
1
Ns
1
Nr
1
Nr
1
Nd
Noise whitening
filter
Mobile Station(D)
Results and Discussions: Configuration I
Average SER of AF and DF system using QPSK modulation for antenna configuration (Ns,Nr,Nd)
Average SER of AF system for antenna configuration (Ns,Nr,Nd) in different correlation scenarios
Results and Discussions: Configuration II
Average SER of BPSK and 4PAM constellations using Alamouti’s coding for antenna configuration (Ns,Nr,Nd)
Summary An approach to hybrid satellite/terrestrial network
towards the achievement of ambitious coverage requirement of 4G networks is proposed.
The proposed concept is complemented with MIMO technology.
MIMO system is found to have significant performance gains over single input single antenna (SISO) system.
Two different system configurations are proposed for MIMO relaying concept implementation in LMS communication.
Future Research Feasibility and performance analysis in
multiple relay environment. Assessment of advantages and drawbacks
of relaying characteristics of infrastructure based fixed relays or mobile devices carried by subscribers.
List of PublicationsConference Publication Yamuna Dhungana and Nandana Rajatheva, “Analysis of LMS
based dual hop MIMO systems with beamforming,” in Proc. IEEE Int. Conf. on Commun. (ICC2011), accepted for publication.
Journal Publications Yamuna Dhungana and Nandana Rajatheva, “Impact of
antenna correlation on LMS based dual hop MIMO systems with beamforming,” IEEE Trans. Wireless Commun., submitted for publication.
Yamuna Dhungana and Nandana Rajatheva, “Dual Hop MIMO OSTBC for LMS Communication,” IEEE Commun. Letter., submitted for publication.
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