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Project 2C(ii) Implementation of OFDM on AWGN Channel

Project 2C(ii) Implementation of OFDM on AWGN Channel. Karira Vishal D Karunakar H V Prabeedh Kumar Ravi Kiran Sreenivas Reddy. Project Architecture. Tasks Assigned. Prabeedh kumar and Sreenivas Reddy Audio Input file to Data Bits

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Project 2C(ii) Implementation of OFDM on AWGN Channel

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  1. Project 2C(ii) Implementation of OFDM on AWGN Channel Karira Vishal D Karunakar H V Prabeedh Kumar Ravi Kiran Sreenivas Reddy

  2. Project Architecture

  3. Tasks Assigned • Prabeedhkumar and Sreenivas Reddy • Audio Input file to Data Bits • Data Bits to Symbol Mapping & Symbol to Data Bits Mapping • Karunakar and Ravi Kiran • Implementation of FFT and IFFT • KariraVishal • Add and Remove Cyclic Prefix • AWGN Channel Implementation

  4. Delivered • OFDM matlab code for Single User. • C code for Bit to symbol and Symbol to Bit mapping. • C code for FFT and IFFT on Cell SDK Simulator. • C code for AWGN Channel on Cell SDK simulator. Problems Faced • Integrating the Audio file in Cell SDK Simulator. Future Tasks • Handling the multi user inputs. • Implementation of OFDMA on an AWGN Channel

  5. Conversion of wave file to bits • I have taken .wav file as input. • After that converted that wav file to text file which contains binary data

  6. Wave file format:

  7. Conversion of bits to symbols • I have sent that binary into channels • I modulated that data by using BPSK(Binary Phase Shift Keying)

  8. FFT & IFFT Block Implementation • IFFT and FFT block is implemented using radix-2 algorithm,using Cooley tukey algorithm. • Dividing the data in equal proportion and loading it into all 8 SPU using the above algorithm. • Reference: SDK for Multicore Acceleration ,Programming Tutorial. • Task of PPU: • Intializing the context data for Thread creation. • Load data for each SPU. • Get back the result after the calculation.

  9. FFT & IFFT Block Implementation(contd..) • Task of SPU • Getting the data from PPU. • Initate DMA to/from 32 bit Effective Address. • Performing the calculation for each SPE loaded data. • Perform write operation to and initiate DMA.

  10. Add and Remove Cyclic Prefix Cyclic Prefix : A copy of the last part of OFDM signal is attached to the front of itself. • In the Transmitter side, we have added 10% of the total number of bits and in the Receiver side, we have removed them. • This bits helps us to combat against ISI almost completely. • But it also leads to reduction in the Bandwidth Efficiency.

  11. AWGN channel • AWGN (Additive White Gaussian Noise) channel adds noise to the transmitted bits in order to present a real time effect of noise. • Y = X + N where Y = Received Sequence X = Transmitted Sequence N = Noise

  12. References • Cell BE Architecture and its First Implementation: http://www.ibm.com/developerworks/power/library/pa-cellperf/ • Cell BE Example Sites: http://www.ibm.com/developerworks/library/pa-sdkexamples/index.html • Cell BE Resource Center: http://www.ibm.com/developerworks/power/cell/?S_TACT=105AGX16&S_CMP=HP • Make file help: http://www.cat.pdx.edu/documents/make.html • Posix Thread: http://www.ibm.com/developerworks/linux/library/l-posix1.html

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