Using CLNS for FFTs in OFDM demodulation of UWB receivers

Author

Vouzis, Panagiotis ; Arnold, Mark G. ; Paliouras, Vassilis

Author_Institution

Comput. Sci. & Eng. Dept., Lehigh Univ., Bethlehem, PA, USA

fYear

2005

fDate

23-26 May 2005

Firstpage

3954

Abstract

Complex logarithmic number system (CLNS) uses a log/polar complex representation. We propose CLNS for the 128-point fast Fourier transform (FFT) in orthogonal frequency division multiplexing (OFDM) demodulation. We show the cost and quality of the FFT depends on the CLNS base b. Memory requirements decrease as b increases. Experimentally, when optimized for signal-to-noise ratio (SNR), b>2 results in memory reduction up to 36% compared to b=2. Dependence of the SNR on the input´s standard deviation variations is weaker for the CLNS than for fixed-point and decreases as b increases.

Keywords

OFDM modulation; digital arithmetic; fast Fourier transforms; radio receivers; ultra wideband communication; CLNS base; FFT memory requirements; OFDM demodulation; SNR optimization; UWB receivers; complex logarithmic number system; complex number arithmetic circuits; fast Fourier transform; orthogonal frequency division multiplexing; Arithmetic; Computer science; Costs; Demodulation; Fast Fourier transforms; Flexible printed circuits; OFDM; Quantization; Signal to noise ratio; Ultra wideband technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1465496

Filename

1465496