Browsing by Subject "FHT"
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Item Open Access Design of application specific instruction set processors for the EFT and FHT algorithms(2006) Atak, OğuzhanOrthogonal Frequency Division Multiplexing (OFDM) is a multicarrier transmission technique which is used in many digital communication systems. In this technique, Fast Fourier Transformation (FFT) and inverse FFT (IFFT) are kernel processing blocks which are used for data modulation and demodulation respectively. Another algorithm which can be used for multi-carrier transmission is the Fast Hartley Transform algorithm. The FHT is a real valued transformation and can give significantly better results than FFT algorithm in terms of energy efficiency, speed and die area. This thesis presents Application Specific Instruction Set Processors (ASIP) for the FFT and FHT algorithms. ASIPs combine the flexibility of general purpose processors and efficiency of application specific integrated circuits (ASIC). Programmability makes the processor flexible and special instructions, memory architecture and pipeline makes the processor efficient. In order to design a low power processor we have selected the recently proposed cached FFT algorithm which outperforms standard FFT. For the cached FFT algorithm we have designed two ASIPs one having a single execution unitItem Open Access Efficient parallel digital signal processing algorithms for hypercube-connected multicomputers(1992) Derviş, ArgunIn this thesis, efficient parallelization of Digital Signal Processing (DSP) algorithms, (FFT, FHT and FCT), on multicomputers implementing the hypercube interconnection topology are investigated. The proposed algorithms, maintain perfect load-balance, minimize communication overhead, can overlap communications with computations and achieve regular computational patterns. The proposed parallel algorithms are implemented on Intel’s iPSC/2^ hypercube multicomputer with 32 processors. High efficiency and almost linear speedup values are obtained for even small size problems.