Ofdm Wireless Video Streaming

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  • Topic: Modulation, Orthogonal frequency-division multiplexing, Wireless
  • Pages : 62 (12968 words )
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  • Published : January 26, 2013
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Wireless OFDM-Based Real -time
Video Streamer

Final FYP Report

Prepared by:
Basem S. Nakhal
Tammam R. Sahli
Ziad M. Zein

American University of Beirut

Department:
Electrical and Computer Engineering

Advisor:
Dr. Walid Ali Ahmad

May 23, 2006

Table of Contents
List of Illustrations …… ……….....................................…………………………iv Abstract…………………………………………………………………………….v 1. Introduction …..………….…………….……….……….…………………… 1 2. Literature Review …....………..…………… ……………..…………………2 2.1 OFDM ……….…… ………. ………..…………………………….…………2 2.2 Equivalence to DFT ………………………..……….……….………………5 2.3 Cyclic Prefix …..…..………….……………… ..……………………….…… 6 2.4 Matrix Model …………..…………………… ..…… ………………….…… 7 2.5 Channel Estimation ……………….. …………...……..…………………… 8 2.5.1 Coherent Detection ……..……………..…………………… ………..…… 8 2.5.2 Block- Type Pilot arrangement … .……………………..…………………… 8 2.5.3 Comb- Type Pilot Arrangement … ………………….. ….….. ………………8 2.5.4 Non -coherent detection ……..… ……………..…………… .………………9 2.6 CODING…………………………….. .………….…………………………10 2.6.1 Coded OFDM … ……………..……………….… .………………………10 2.6.2 Block Encoding … …………… ………..… ……………………………… 11 2.6.3 Convolutional Encoding … ..………………………………………………11 2.6.4 Concatenated Coding … ...………………… …………..…………………11 2.7 Peak to average power ratio (PAPR) …..…………….…………. …..………11 2.8 Non Idealities ………………………….………..…………………………12 2.8.1 Inter Symbol Interference ………… ………………..…………………… 12 2.8.2 Intra Symbol Interference ……………… ………………………..………12 2.8.3 Local Oscillator Frequency Offset … ……………………… … ……………13 2.8.4 Local Oscillator Phase Offset ……...…………………..…………… .……13 2.8.5 FFT Window offset…………… …………. ……………… ………………13 2.8.6 Channel Disturbances ………………………………….. ….. ……………13 2.8.7 Carrier Interference ……………………… ………………..….………… 13 2.8.8 Phase Noise ……………………………………………………… ………14 2.9 Synchronization ………………………….…….…………………………14 2.10 Applications….…...………….……………………………………………14 2.10.1 Wideband Data Communications and Standards … …………………….… 15 2.10 .2 Digital Audio Broadcasting ……. ………… ……………..………………15 2.10 .3 Terrestrial Digital Video Broadcasting … …………………. ..……………15 2.10.4 Magic WAND … ..………………. ……………..… .…………………… 15 2.10 .5 WiMAX ………………….…… ……..… .……..………………………16 2.1 1 A Similar Application at University of Texas Austin ….…...….………17

3. Alternatives …………………… ………….………………..…………………18 3.1 Modulation Scheme ……………………………..…………………………18 3.2 Implementation of OFDM …….. ………………….………………………18 3.3 Bandwidth ………………………………..….……………………..………19

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American University of Beirut

May 2006

3.4 Number of sub carriers ………………..…… …..…………………………19 3.5 Synchronization …………… ……..………………………….. ……………19 3. 5.1 Synchronization with the cyclic prefix …………………………..………… 19 3. 5.2 Synchronization with training symbols …………………….. ……….…….. 20 3.6 Channel Coding ………………………………..…. ……………………… 21 3.7 Channel Estimation ……………… …....…… …………………………… 21 3.8 Cyclic Prefix Length…………………....………………………………… 22 3.9 Modulation Scheme over each subcarrier ……………………………….22 3.10 NI Hardware …..…………………………… ……..….. ………………. 24 3.11 Other Hardware………………………………….. ………………………24 3.1 1.1 MAX2644 LNA …………………… ………..………….……………… 25 3.11.2 RMPA2455 PA .………… … ……..…………………………………… 25 3.11.3 Antennas … .…… ………..…… …………………..…… ………………25 3.11.4 Camera ……………..… ……....……………….………………………25

4. Budget ………………………. ….……… .……….……………………………26 5. Modeling and Analysis ……………………………… …………………..…27 5.1 System Specifications …………….………….…….………………………27 5.2 Power Calculation…………………………………….…………………… 27 5.3 B lock Diagrams …………………….. ……..………………………………28 5.4 Simulation: General Overview ………..………… ….…………………… 29 5.4.1 Quantitative Evaluation ……… … …………..…… ………………………29 5.4.2 Qualitative Evaluation ………… … .…………..…… .…………………… 32

6. Tentative Time Schedule for Spring Term ……..….……………..….. 33 7. Implementation………………………..…….………………….……………34 7.1 LabVIEW and NI Hardware …………………..…….…………………… 34 7.1.1 Transmitter Components ………..……………..…….……………………34 7.1.1.1 Software Level ……………..………………..…….…………………… 34 7.1.1.1.1 Picture to Bits...
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