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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

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performance analysis of lms based mimo relay communication

PERFORMANCE ANALYSIS OF LMS BASED MIMO RELAY COMMUNICATION

Yamuna Dhungana

Supervisor : Dr. R.M.A.P. Rajatheva

May 16, 2011

motivation
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
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 communicat ion
Relay Assisted Cooperative communication

R

S

D

  • 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)
  • Improves transmission reliability through diversity
proposed system basic model
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
advantages
Advantages
  • Brings satellite coverage indoor or in tunnels
  • Can serve low cost user terminal with no satellite transmission/ reception capabilities

Link not available due

to heavy shadowing

  • 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
Proposed System: Enhanced Model
  • The basic relaying concept in LMS communication is enhanced through the incorporation of multiple antennas at all the three terminals.

Multiple input multiple output (MIMO) system

Single Antenna System

Transmitter

.

.

.

.

Receiver

  • 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
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 implementation
System configurations proposed for implementation

Configuration I:

Transmit

Beamforming

Receive

Beamforming

.

.

.

.

Source

(S)

Relay

(R)

Destination

(D)

.

.

.

HSR

hRD

Nd

Ns

Nr

Selected Antenna

  • The configuration is analyzed
  • Under both AF and DF relaying
  • Considering both uncorrelated and correlated antennas
configuration ii
Configuration II:

1

1

1

1

.

.

.

Fixed gain Amplifier

OSTBC

encoder

.

.

.

.

.

.

Noise whitening filter

.

.

.

OSTBC decoder

H1

H2

Nr

Nr

Ns

Nd

Terrestrial Relay node

(R)

Satellite

(S)

Mobile Station

(D)

results and discussions configuration i
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
Results and Discussions: Configuration II

Average SER of BPSK and 4PAM constellations using Alamouti’s coding

for antenna configuration (Ns,Nr,Nd)

summary
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
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 publications
List of Publications

Conference 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.
thank you

THANK YOU

ANY QUESTION ?