DocumentCode :
3267149
Title :
Design of fixed-point high-performance FFT processor
Author :
Wenqi, Li ; Xuan, Wang ; Xiangran, Sun
Author_Institution :
Commun. Univ. of China, Beijing, China
Volume :
5
fYear :
2010
fDate :
22-24 June 2010
Abstract :
This paper, based on the complexity and hardware requirement of conventional FFT algorithms, analyses the architecture of radix-4 Single-Path Delay Feedback (SDF) in DIF and present an efficient FFT processor for real-time applications. A test bench is built up comparing Signal to Quantization Noise Ratio (SQNR) performances of the processors with a float-point model and fixed-point one. Several values of I/O word length and twiddle factor word length are implemented, to investigate the quantization effect of fixed-point arithmetic with limited precision derived from rounding or truncation errors, for enhancing the output performance. The simulation tests and an implementation of 1024-point FFT targeted on XC5VSX50T FPGA, show that the proposed FFT processor has a high computational frequency and hence suitable for usual OFDM wireless applications.
Keywords :
OFDM modulation; fast Fourier transforms; feedback; field programmable gate arrays; fixed point arithmetic; floating point arithmetic; pipeline arithmetic; real-time systems; I/O word length; OFDM wireless application; XC5VSX50T FPGA; fast Fourier transform; fixed-point arithmetic; float-point model; high-performance FFT processor; orthogonal frequency division multiplexing; radix-4 single-path delay feedback; real-time application; rounding error; signal to quantization noise ratio; truncation error; twiddle factor word length; Algorithm design and analysis; Delay; Feedback; Fixed-point arithmetic; Hardware; Performance evaluation; Quantization; Signal processing; Signal to noise ratio; Testing; Keywords-FFT; fixed-point; pipeline; radix-4; twiddle factor;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Education Technology and Computer (ICETC), 2010 2nd International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-6367-1
Type :
conf
DOI :
10.1109/ICETC.2010.5529796
Filename :
5529796
Link To Document :
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