Ricardo, CN, Inácio JA, Gerald JA, Ortigueira MD.
2003.
New BCH-Derived Sequences for CDMA Systems. 46th IEEE - Midwest Symposium on Circuits and Systems. :1255–1258.
AbstractNew BCH-derived PN-EB (pseudo-noise even balanced) sequences suitable to be used in CDMA systems are presented in this paper. It is assumed a new definition for processing gain, which better accounts for the system performance regarding the narrow band noise rejection, and it is shown how to obtain high processing gain values, namely, by using zero mean spreading signals in channels with selective noise. The new sequences have low autocorrelation levels, exist in large numbers and can provide higher processing gain with selective noise.
Evans, G, Goes J, Steiger-Garção A, Ortigueira MD, Paulino N, Sousa-Lopes J.
2003.
Low-voltage low-power CMOS analogue circuits for Gaussian and uniform noise generation, May. IEEE International Symposium on Circuits and Systems. :145–148.
AbstractA CMOS analogue circuit for Gaussian noise generation as well as a novel circuit for transforming Gaussian noise into uniform noise, both designed for operating with a supply voltage of 1.5V, are presented. Both circuits are optimized for a 0.35 {\ensuremathμ}m standard CMOS technology using an equation-based design methodology based on genetic algorithms. Electrical simulations demonstrate that high noise amplitudes together with reasonable bandwidths can be achieved with relatively low power dissipation. Potential applications include self-calibration and on-chip self-testing of video-rate analogue-to-digital converters.
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