Switching Presentation

8/8/2019 Switching Presentation

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Switching Between Hybrid MIMO Structures for VideoTransmission Based on Distortion Model

Martin Diomedes Bravo Obando, Walter Da Cruz Freitas Junior andFrancisco Rodrigo P. Cavalcanti

Federal University of CearaDepartment of Teleinformatic Engineering

Fortaleza, Brazil

GTEL (PPGETI) Wednesday 9 September 2010 1 / 18
http://find/http://goback/


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Outline

1 Introduction

2 Motivation

3 Objectives

4 Problem

5 Proposed solution

6 Simulation Parameters

7 Results

8 Conclusions



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Introduction

Systems of services for next generation networks;

Wireless links are affected by propagation mechanisms;

The cooperation between the different layers that compose theprotocol stack;

The application layer;Distortion model.

The physical layer;

Hybrid MIMO structures(HMS).

Video quality assessment mechanims.



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Motivation

Video transmission over wireless communication systems and theirintegration with the Internet.



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Motivation

The additive distortion model for media data units

Group of Pictures example



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Motivation

Hybrid MIMO Structure:G2+1+1

Hybrid MIMO Structure: G2+G2



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Motivation

Interference Cancellation Algorithm for the Hybrid MIMO Structures



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Objectives

Improved the transmission of video streaming over wireless systems;

Take advantage of multiplexing and diversity gains provided by hybridMIMO structure;

Use of the Distortion model of video for switching between HMS inthe physical layer;

Improved the objective and subjective video quality at the end user.



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Problem

minDtotal(Dc, p, nal,Di,HMS)

http://carphoned.avi/http://find/http://goback/


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Proposed solution



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Simulation Parameters

Channel model4 transmit antennas (Mtx);

4 receive antennas (Mrx);

Wireless channel assumed rich scattering;

Flat fading;The channel quasi-static by block;

H and N are i.i.d (ZMCSCG).

Sampled received signal

Y =

MtxHS+N.



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Simulation Parameters

Parameters

Monte Carlos simulation;

HMSs G2+G2 and G2+1+1;

8PSK modulation;

SIC detector for HMS;

Cedelay per GoP in the transmitter side of 0.9 and 1 for HMSs;

H.264/AVC video coder;

Video encoded bit rate of 128 kbps;

GOP structure of 10 frames;

Video sequences of video: Foreman and Carphone;

QCIF format with 4 2 0 sampling;

Packet size of 500 bytes.



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Results

BER Performance of hybrid MIMO structures



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Results

Objective video quality



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Results

Web page for assessment of video quality



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Results

Subjective performance with SNR=11 dB


R l


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Results

Examples of subjective quality of the frame 194 from the video

sequences Carphone transmitted with a SNR = 11dB



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ConclusionsIs proposed a switching scheme between hybrid MIMO (HMS)schemes based on a distortion model per Group of Pictures (GoP),which involves the use of application and the physical layers;

The objective and subjective video quality is improved using theproposed algorithm;

The proposed algorithm is a feasible scheme that can be adopted forvideo streaming transmission over wireless systems.


Switching Presentation

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