Title: An indexed-scaling pipelined FFT processor for OFDM-based WPAN applications
Authors: Chen, Yuan
Tsao, Yu-Chi
Lin, Yu-Wei
Lin, Chin-Hung
Lee, Chen-Yi
Department of Electronics Engineering and Institute of Electronics
Keywords: convergent block floating point (CBFP);data scaling;fast Fourier transform (FFT);indexed-scaling;mixed-radix multipath delay feedback (MRMDF);orthogonal frequency-division multiplexing (OFDM);wireless personal area network (WPAN)
Issue Date: 1-Feb-2008
Abstract: In this brief, a high-throughput and low-complexity fast Fourier transform (FFT) processor for wideband orthogonal frequency division multiplexing communication systems is presented. A new indexed-scaling method is proposed to reduce both the critical-path delay and hardware cost by employing shorter wordlength. Together with the mixed-radix multipath delay feedback structure, the proposed FFT processor can achieve very high throughput with low hardware cost. From analysis, it is shown that the proposed indexed-scaling method can save at least 11% memory utilizations compared to other state-of-the-art scaling algorithms. Also,,a-test chip of a 1.2 Gsample/s 2048-point FFT processor has been designed using UMC 90-nm 1P9M process with a core area of 0.97 mm(2). The signal-to-quantization-noise ratio (SQNR) performance of this test chip is over 32.7 dB to support 16-QAM modulation and the power consumption is about 117 mW at 300 MHz. Compared to the fixed-point FFT processors, about 26% area and 28% power can be saved under the same throughput and SQNR specifications.
URI: http://dx.doi.org/10.1109/TCSII.2007.910771
ISSN: 1549-7747
DOI: 10.1109/TCSII.2007.910771
Volume: 55
Issue: 2
Begin Page: 146
End Page: 150
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