Topic
Interference (wave propagation)
About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.
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TL;DR: A noncontact and nondestructive technique that uses laser-generated and detected surface acoustic waves to rapidly determine the local acoustic velocity, in order to map the microstructure of multi-grained materials is developed.
Abstract: We have developed a noncontact and nondestructive technique that uses laser-generated and detected surface acoustic waves to rapidly determine the local acoustic velocity, in order to map the microstructure of multi-grained materials. Optical fringes excite surface waves at a fixed frequency, and the generation efficiency is determined by how closely the fringe spacing matches the acoustic wavelength in the excitation region. Images of titanium alloys are presented, acquired using the technique. Methods to improve the current lateral resolution of 0.8mm are discussed, and the ability to measure velocity change to an accuracy of one part in 3300 is experimentally demonstrated.
59 citations
29 Nov 2004
TL;DR: A time-hopping impulse-radio system that uses transmitted-reference pulses for implicit channel estimation and equalization and a hybrid receiver structure first performs a filtering matched to the hopping sequence, and a subsequent correlation of the data pulses with the reference pulses is considered.
Abstract: We consider a time-hopping impulse-radio system that uses transmitted-reference pulses for implicit channel estimation and equalization. A hybrid receiver structure first performs a filtering matched to the hopping sequence, and a subsequent correlation of the data pulses with the reference pulses. We analyze the performance of such a system both in AWGN and in multipath. For the AWGN case, we give exact expressions for the bit error probability that take into account the non-Gaussian nature of the noise-noise crossterms arising in the correlators. For the multipath case, we analyze inter-frame interference, as well as multipath interference from the reference pulse to the data pulse, providing dosed-form equations in the limit of a large number of multipath components.
59 citations
TL;DR: Using Gaussian approximations for multiple access interference, the authors present a closed form bit error rate formula for a simple multistage interference cancellation system for CDMA that provides an asymptotic limit on performance improvement as the number of cancellation stages approaches infinity, and yields a minimum signal/noise ratio requirement for effective interference cancellation.
Abstract: Using Gaussian approximations for multiple access interference, the authors present a closed form bit error rate formula for a simple multistage interference cancellation system for CDMA. The expression provides an asymptotic limit on performance improvement as the number of cancellation stages approaches infinity, and yields a minimum signal/noise ratio requirement for effective interference cancellation.
59 citations
Patent•
04 Nov 1999
TL;DR: In this article, a receiving device including a cross polarization interference canceler (XPIC) is described, which optimizes bandwidth efficiency of an optical communication link by enabling the reconstruction of two optical signals transmitted with generally orthogonal polarization states and routed over a single fiber optic transmission medium.
Abstract: Implemented in both coherent and non-coherent optical systems, a receiving device including a cross polarization interference canceler (XPIC) is described. For these embodiments, the XPIC optimizes bandwidth efficiency of an optical communication link by enabling the reconstruction of two optical signals transmitted with generally orthogonal polarization states and routed over a single fiber optic transmission medium in the same frequency band.
58 citations
Patent•
19 Sep 2008TL;DR: In this article, the use of fractional reuse and other techniques to manage interference that occurs during wireless communication may be discussed, such as HARQ interlaces, portions of a timeslot, frequency spectrum and spreading codes.
Abstract: Interference that occurs during wireless communication may be managed through the use of fractional reuse and other techniques. In some aspects fractional reuse may relate to HARQ interlaces, portions of a timeslot, frequency spectrum, and spreading codes. Interference may be managed through the use of a transmit power profile and/or an attenuation profile. Interference also may be managed through the use of power management-related techniques.
58 citations