Title :
Numerical Analysis of Dynamic SNR Management by Controlling DSP Calculation Precision for Energy-Efficient OFDM-PON
Author :
Kimura, Hideaki ; Nakamura, Hirotaka ; Kimura, Shunji ; Yoshimoto, Naoto
Author_Institution :
NTT Access Network Service Syst. Labs., NTT Corp., Yokosuka, Japan
Abstract :
We propose a novel energy-saving technique using a variable precision digital signal processor for an orthogonal frequency division multiplexing (OFDM)-passive optical network. Our technique minimizes energy consumption while satisfying the bit error rate requirements by controlling the calculation precision of fast Fourier transform (FFT) and inverse FFT when generating an OFDM signal. We clarify the feasibility of our proposed technique numerically for QPSK and 16 quadratic-amplitude modulation signals. The simulation results indicate that calculation precision can be reduced according to the transmission distance.
Keywords :
Fourier transform optics; OFDM modulation; error statistics; fast Fourier transforms; inverse transforms; numerical analysis; optical modulation; passive optical networks; quadrature amplitude modulation; quadrature phase shift keying; DSP calculation precision; OFDM signal; QPSK; bit error rate requirements; dynamic SNR management; energy consumption; energy-efficient OFDM-PON; energy-saving technique; fast Fourier transform; inverse FFT; numerical analysis; orthogonal frequency division multiplexing-passive optical network; quadratic-amplitude modulation signals; signal-to-noise ratio; transmission distance; variable precision digital signal processor; Bit error rate; Digital signal processing; Energy consumption; OFDM; Optical network units; Passive optical networks; Signal to noise ratio; Digital signal processing; energy reduction; fiber optics communications; orthogonal frequency division multiplexing passive optical network (OFDM-PON);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2222878
