Consider a received signal consisting of noise and an unknown wave-form that arrives at a sensor through both a direct path and an attenuated and delayed specular path. We show that a commonly-used frequency-domain model for such a signal is valid essentially only under the assumption that the waveform that underwent multipath propagation is band-limited. Furthermore, we derive suucient conditi...

This paper describes how to perform a low complexity frequency offset estimation in the presence of direct current (DC) offset based on a received periodic preamble. By designing a suitable preamble, we perform frequency and DC offsets estimation concurrently, followed by a simple compensator which reduces the frequency offset error induced by the presence of either a residual or actual DC offs...

A common practice when analyzing systems using multiple antennas at both ends is to focus on the multipath properties and normalize the SNR out of the channel matrix. This paper studies the relationship between the signal strength and multipath richness using indoor measurements taken at the Brigham Young University campus. It is found that the SNR and the multipath richness can be strongly cor...

SPECKLE NOISE REDUCTION IN MEDICAL ULTRASOUND IMAGES USING PARTICLE SWARM OPTIMIZATION WITH ARTIFICIAL NEURAL NETWORKS: COMPARATIVE APPROACH Er. Manpreet Kaur1 and Er. Danvir Mandal2 1CEC, Landran, Mohali E-mail: Manpreet.n.kaur @gmail.com 2IET BHADDAL, Ropar E-mail: [email protected] Medical images are normally affected by noise due to various sources of interferences and other pheno...