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R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
R.Selvakumar
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R.Selvakumar

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  • 1. Under The Guidens Of Mr.K.N.Vijeyakumar,M.E, PhD Presented by R. Selvakumar.B.Tech MIMO-OFDM Link performance with Reduction of PAPR Using Linear Companding Transform 03.10.2009 MIMO-OFDM&PAPR
  • 2. Area of work: OFDM (Orthogonal Frequency Division Multiplexing)
  • 3. TYPES OF OFDM <ul><li>MIMO-OFDM </li></ul><ul><li>C-OFDM </li></ul><ul><li>V-OFDM </li></ul><ul><li>W-OFDM </li></ul><ul><li>Flash-OFDM </li></ul><ul><li>MIMO-OFDM : I s a modulation technique for transmitting large amounts of digital data over a radio wave. MIMO U ses multiple antennas to transmit and receive radio signals </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 4. Objective: To use linear companding transform for ofdm signals, To make performance analysis in terms of peak to average power reduction and bit error rate.
  • 5. LITERATURE SURVEY <ul><li>Optimal Pilot Sequence Design for Channel Estimation in MIMO OFDM Systems. IEEE COMMUNICATIONS LETTERS, VOL. 10, NO. 1, JANUARY 2008. </li></ul><ul><li>Linear Companding Transform for the Reduction of Peak-to-Average Power Ratio of OFDM Signals. IEEE TRANSACTIONS ON BROADCASTING, VOL. 55, NO. 1, MARCH 2009 </li></ul><ul><li>PAR-Constrained Training Signal Designs for MIMO OFDM Channel </li></ul><ul><li>Estimation in the Presence of Frequency Offsets . IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 8, AUGUST 2008. </li></ul><ul><li>PAPR Reduction in OFDM Systems IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 6, JUNE 2007 </li></ul><ul><li>MIMO-OFDM Channel Estimation in the Presence of Frequency Offsets. IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 6, JUNE 2008. </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 6. LITERATURE SURVEY <ul><li>OFDM joint data detection and phase noise cancellation based on minimum mean square prediction error . Signal Processing 89 (2009) 502–509 journal homepage: www.elsevier.com/locate/sigpro . </li></ul><ul><li>Channel estimation in space and frequency domain for MIMO-OFDM systems . June 2009,science/journal/10058885. </li></ul><ul><li>Is PAPR reduction always justified for OFDM? </li></ul><ul><li>An Improved LS Time Domain Channel Estimation Algorithm Based on MIMO-OFDM System. 2009 International Conference on Networks Security, Wireless Communications and Trusted Computing. </li></ul><ul><li>Adaptive Resource Allocation with Multiuser Interference Cancellation </li></ul><ul><li>for MIMO OFDM Systems </li></ul><ul><li>The Frequency Offset Estimator Based on All-Phase FFT for OFDM Systems. 2009 International Conference on Signal Processing Systems </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 7. EXISTING METHOD <ul><li>OFDMPAPR concept : </li></ul><ul><li>Analysis different OFDM PAPR reduction techniques, based </li></ul><ul><li>on computational complexity, bandwidth expansion. </li></ul><ul><li>OFDMPAPR Reduction Methods: </li></ul><ul><li>Clipping </li></ul><ul><li>Additive Correction Function </li></ul><ul><li>Peak Windowing </li></ul><ul><li>BERC Technique </li></ul><ul><li>Scrambling </li></ul><ul><li>Coding </li></ul><ul><li>Selective Mapping </li></ul><ul><li>Partial Transmit Sequence (PTS) </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 8. BASE PAPERS <ul><li>An Overview: Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals Tao Jiang, Member, IEEE, and Yiyan Wu, Fellow, IEEE </li></ul><ul><li>IEEE TRANSACTIONS ON BROADCASTING, VOL. 54, NO. 2, JUNE 2009. </li></ul><ul><li>problem in existing method: </li></ul><ul><li>Non Linear Districution is more. </li></ul><ul><li>In band noise => Increase BER , PAPR is more. </li></ul><ul><li>PAR-Constrained Training Signal Designs for MIMO OFDM Channel </li></ul><ul><li>Estimation in the Presence of Frequency Offsets IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 8, AUGUST 2008. </li></ul><ul><li>problem in existing method: </li></ul><ul><li>Very sensitive to frequency errors (Tx. & Rx. offset) </li></ul><ul><li>peak to average ratio( PAPR ) is more. </li></ul>
  • 9. BASE PAPER <ul><li>Optimal Training Design for MIMO OFDM Systems </li></ul><ul><li>in Mobile Wireless Channels IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 51, NO. 6, JUNE 2005 </li></ul><ul><li>problem in existing method: </li></ul><ul><li>Intercarrier Interference (ICI) between the subcarriers (ICI) . </li></ul><ul><li>PAPR is more. </li></ul><ul><li>Channel estimation in space and frequency domain for MIMO-OFDM systems . June 2009, www.sciencedirect.com/science/journal/10058885 </li></ul><ul><li>problem in existing method: </li></ul><ul><li>More Degradation </li></ul><ul><li>peak to average ratio ( PAPR ) is more. </li></ul>
  • 10. BASE PAPER <ul><li>LINEAR COMPANDING TRANSFORM FOR THE REDUCTION OF PEAK-TO-AVERAGE POWER RATIO OF OFDM SIGNALS . IEEE TRANSACTIONS ON BROADCASTING, VOL. 55, NO. 1, MARCH 2009 </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 11. PROPOSED METHOD <ul><li>Concept: </li></ul><ul><li>A major drawback of orthogonal frequency-division multiplexing (OFDM) signals is their high peak-to-average power ratio (PAPR), which causes serious degradation in performance when a nonlinear power amplifier (PA) is used. </li></ul><ul><li>Appling Companding transform (CT) method to reduce PAPR without restrictions on system parameters </li></ul><ul><li>Techniques : </li></ul><ul><li>Linear Companding Transform(LCT). </li></ul><ul><li>Linear Nonsymmetrical Companding transform (LNST) </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 12. CHARACTERISTICS <ul><li>Very less Peak to average power ratio(PAPR). </li></ul><ul><li>Reducing Serious Degradation in an OFDM. </li></ul><ul><li>Optimal amplitude and phase of peak reduction carriers(PRC). </li></ul><ul><li>Reliable and have a high spectral efficiency. </li></ul><ul><li>Achieve more signal to noise ratio. </li></ul><ul><li>Bandwidth and complexity limits. </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 13. IMPLEMENTATION Used Terms: Tool Used: <ul><li>Orthogonal Frequency-division Multiplexing (OFDM), </li></ul><ul><li>Peak-to-Average Power Ratio (PAPR). </li></ul><ul><li>Nonlinear Power Amplifier (PA), </li></ul><ul><li>MAT-LAB Simulation Tool. </li></ul>03.10.2009 MIMO-OFDM&PAPR
  • 14. THANK YOU 03.10.2009 MIMO-OFDM&PAPR

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