dibyayan sharma - Academia.edu (original) (raw)
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In this paper, we have analyzed the performance characteristics of OFDM data transmission with re... more In this paper, we have analyzed the performance characteristics of OFDM data transmission with regard to a new high speed RS decoding algorithm. The various characteristics identified are mainly speed and accuracy of the transmission irrespective of channel behaviour. We consider two cases viz. data transmission without error control and data transmission with error control. Each of these cases are duly analyzed and it is proven that high speed RS decoding algorithms can actually benefit OFDM data transmission for advanced communication systems only if implemented at the hardware (VLSI) level because of significant processing overhead involved in software based implementation even though the algorithm may have lower computational complexity.
Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) are two transform compression t... more Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) are two transform compression techniques that are used extensively for data compression, most notably in audio, speech and image processing applications. Several algorithms for computation of DCT and DST coefficients have been developed so far, among which independent update algorithm seems to be the most promising technique for future applications. In this paper, the FPGA implementation of the DCT – II independent update algorithm has been undertaken and its performance is evaluated. Use of the above algorithm for applications like image intelligence, biometric systems, image duplication etc. is also discussed.
Digital Image Processing (DIP) is a technology that has widespread applications. However, the use... more Digital Image Processing (DIP) is a technology that has widespread applications. However, the use of images for different applications requires efficient noise removal, image enhancement and image restoration. Rank order filtering is a non-linear method by which these tasks are accomplished. These filters can remove noise from an image while preserving edge information. Rank order filters work by sorting a window of input pixels and selecting the input with a certain rank as output pixel. In this paper, FPGA based hardware design of an efficient pixel sorter is presented which can be used for rank order filters and implemented in real-time for image processing systems. The hardware has been tested with sample grayscale images and its performance has been evaluated. Lastly, an analysis has been done on the use of the proposed hardware for image based biometric authentication systems.
In this paper, we have analyzed the performance characteristics of OFDM data transmission with re... more In this paper, we have analyzed the performance characteristics of OFDM data transmission with regard to a new high speed RS decoding algorithm. The various characteristics identified are mainly speed and accuracy of the transmission irrespective of channel behaviour. We consider two cases viz. data transmission without error control and data transmission with error control. Each of these cases are duly analyzed and it is proven that high speed RS decoding algorithms can actually benefit OFDM data transmission for advanced communication systems only if implemented at the hardware (VLSI) level because of significant processing overhead involved in software based implementation even though the algorithm may have lower computational complexity.
Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) are two transform compression t... more Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) are two transform compression techniques that are used extensively for data compression, most notably in audio, speech and image processing applications. Several algorithms for computation of DCT and DST coefficients have been developed so far, among which independent update algorithm seems to be the most promising technique for future applications. In this paper, the FPGA implementation of the DCT – II independent update algorithm has been undertaken and its performance is evaluated. Use of the above algorithm for applications like image intelligence, biometric systems, image duplication etc. is also discussed.
Digital Image Processing (DIP) is a technology that has widespread applications. However, the use... more Digital Image Processing (DIP) is a technology that has widespread applications. However, the use of images for different applications requires efficient noise removal, image enhancement and image restoration. Rank order filtering is a non-linear method by which these tasks are accomplished. These filters can remove noise from an image while preserving edge information. Rank order filters work by sorting a window of input pixels and selecting the input with a certain rank as output pixel. In this paper, FPGA based hardware design of an efficient pixel sorter is presented which can be used for rank order filters and implemented in real-time for image processing systems. The hardware has been tested with sample grayscale images and its performance has been evaluated. Lastly, an analysis has been done on the use of the proposed hardware for image based biometric authentication systems.