Эндоскопическая медикаментозная денервация кислотопродуцирующей зоны желудка у больных язвенной болезнью двенадцатиперстной кишки

ДВЕНАДЦАТИПЕРСТНОЙ КИШКИ ЯЗВА /ТЕРПЕПТИЧЕСКАЯ ЯЗВА /ТЕРЭНДОСКОПИЯ ГАСТРОИНТЕСТИНАЛЬНАЯВАГОТОМИЯ /МЕТОДЫСИМПАТЭКТОМИЯ ХИМИЧЕСКАЯДЕНЕРВАЦИЯ /МЕТОД

Performance Evaluation of Rake Receiver for UWB Systems Using Measured

Abstract-The industrial environments are an important scenario for ultra wideband (UWB) communication systems. However, due to large number of metallic scatterers in the surroundings, the multipath offered by UWB channels is dense with significant energy. In this paper, the performance of RAKE receivers operating in a non line-of-sight (NLOS) scenario in these environments is evaluated. The channels used for the evaluation are measured in a medium-sized industrial environment. In addition, a standard IEEE 802.15.4a channel model is used for comparison with the results of the measured data. The performance of partial RAKE (PRake) and selective RAKE (SRake) is evaluated in terms of uncoded bit-error-rate (BER) using different number of fingers. The performance of maximal ratio combining (MRC) and equal gain combining (EGC) is compared for the RAKE receiver assuming perfect knowledge of the channel state. Finally, based on the simulation results, conclusions are drawn considering the performance and complexity issues for system design in these environments

FFT i ett historiskt perspektiv

Några nedslag i Fouriertransformens historia och FFT:ns ursprung från 1805 och framåt behandlas i denna populära betraktelse. Vi stannar upp ett slag hos Gauss, funderar över vad han gjort för oss ingenjörer och vi avslutar med en del praktiska konsekvenser och tips som är aktuella idag

Acoustic Echo Cancelling with Michrophone Arrays

This report describes a novel method to perform acoustic echo cancelling with microphone arrays. The method employs a digital self-calibrating microphone system. The on-site calibration process is a simple indirect calibration which adapts in each special case to the environment and electronic equipment. The method also continuously takes into account environmental disturbances such as car engine noise and fan noise. The method is primarily aimed at handsfree mobile telephones, by suppressing the handsfree loudspeaker and car noise simultaneously. The report also contains an extensive evaluation in a car