Title :
Analysis of bandpass Sigma-Delta conversion in OFDM systems
Author :
Moschitta, Antonio ; Petri, Dario
Author_Institution :
Dipt. di Ingegneria Elettronica e dell´´Informazione, Universita degli Studi di Perugia, Italy
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper analyzes the effect of analog-to-digital bandpass Sigma-Delta conversion on the performance of an Orthogonal Frequency Division Multiplexing (OFDM) receiver. OFDM systems and a related simulation model are briefly described. Sigma-Delta characteristics are optimized with respect to overall BER performance. The nonlinear effects of overload are investigated, and a comparison is made with PCM converters. It is shown that minimizing quantization noise power can lead to suboptimal results. A linear model has been developed to estimate the influence of quantization noise on BER performance and it has been validated by means of simulations. Finally a set of minimum performance requirements for Sigma-Delta converters is established
Keywords :
OFDM modulation; circuit noise; circuit optimisation; error statistics; sigma-delta modulation; BER performance; OFDM systems; PCM converters; bandpass sigma-delta conversion analysis; direct digital modulation; linear model; minimum performance requirements; noise spectral shaping; nonlinear overload effects; orthogonal frequency division multiplexing receiver; quantization noise power; quantizer overload; simulation model; suboptimal results; AWGN; Delta-sigma modulation; Digital modulation; Distributed control; Distributed decision making; OFDM modulation; Performance analysis; Power system modeling; Quadrature amplitude modulation; Quantization;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957473
