FFT/IFFT Block Floating Point Scaling
ثبت نشده
چکیده
Unlike an FFT block that uses floating point arithmetic, a block-floating-point FFT block does not provide an input for exponents. Internally, a complex value integer pair is represented with a single scale factor that is typically shared among other complex value integer pairs. After each stage of the FFT, the largest output value is detected and the intermediate result is scaled to improve the precision. The exponent records the number of left or right shifts used to perform the scaling. As a result, the output magnitude relative to the input level is:
منابع مشابه
A Pipelined FFT Processor using Data Scaling with Reduced Memory Requirements
In this paper, a scaling method for large pipelined FFT implementations is proposed. Compared to existing block scaling methods, like implementations of Convergent Block Floating Point (CBFP), the memory requirements can be reduced while preserving the SNR. The FFT processor is implemented in a 0.35μm standard CMOS technology and is capable of calculating a 2048 complex point FFT or IFFT in 40μ...
متن کاملA 2048 complex point FFT processor using a novel data scaling approach
In this paper, a novel data scaling method for pipelined FFT processors is proposed. By using data scaling, the' FFT processor can operate on a wide range of input signals without performance loss. Compared to existing block scaling methods, like implementations of Convergent Block Floating Point (CBFP), the memory requirements can be reduced while preserving the SNR. The FFT processor has been...
متن کاملA Block Floating Point Implementation for an N-Point FFT on the TMS320C55x DSP
A block floating-point (BFP) implementation provides an innovative method of floating-point emulation on a fixed-point processor. This application report implements the BFP algorithm for the Fast Fourier Transform (FFT) algorithm on a Texas Instruments (TI) TMS320C55x DSP by taking advantage of the CPU exponent encoder. The BFP algorithm as it applies to the FFT allows signal gain adjustment i...
متن کاملA Reduced-Complexity Fast Algorithm for Software Implementation of the IFFT/FFT in DMT Systems
The discrete multitone (DMT) modulation/demodulation scheme is the standard transmission technique in the application of asymmetric digital subscriber lines (ADSL) and very-high-speed digital subscriber lines (VDSL). Although the DMT can achieve higher data rate compared with other modulation/demodulation schemes, its computational complexity is too high for costefficient implementations. For e...
متن کاملImplementation of Fft Algorithm Using Floating Point Numbers in Wimax Communication System
Mobile WiMAX (Worldwide Interoperability for Microwave Access) or 802.16e standard was ratified by the IEEE in late 2005 as a potential to emerge as a real viable competitor to existing 3G technologies. Mobile WiMAX uses an OFDMATM technology called 1K-FFT. Orthogonal Frequency-Division Multiple Access (OFDMA) is a multi-user version of the popular Orthogonal frequency-division multiplexing (OF...
متن کامل