Recent outer bounds on the capacity region of Gaussian interference channels are generalized to m-user channels with m > 2 and asymmetric powers and crosstalk coefficients. The bounds are again shown to give the sum-rate capacity for Gaussian interference channels with low powers and crosstalk coefficients. The capacity is achieved by using single-user detection at each receiver, i.e., treating...

This paper presents an interference model for cellular and microcellular networks. This model enables a unified treatment of all reception environments from purely noise limited to purely interference limited through a parameter denoted the ‘interference to noise ratio’ or INR. Using the model, a simplified spatial description of mobile link outage contours is derived. Computer simulations are ...

Abstract This paper will discuss a method of bluff body noise control that utilises the phenomenon of aerodynamic interference. This technique uses a second body (not necessarily bluff) that is placed in the wake of the bluff body whose noise we wish to control. Through proper understanding of the wake dynamics, the amplitude and phase of the noise from the downstream body can be controlled so ...

In this paper we discuss a number of the ways in which the recognition accuracy of automatic speech recognition systems is affected by ambient noise in the automobile, along with the extent to which various techniques for robust speech recognition can provide for more robust recognition. We consider separately the effects of engine noise, interference by turbulent air outside the car, interfere...

RF interference is a threat to systems that rely on GNSS signals. The carrier-to-noise-ratio (C/No) can be used for detecting interference but is a noisy measurement. The presented detection technique uses the fact that GPS satellites appear in the same place in the sky each sidereal day with similar C/No values except in the presence of interference. Analysis of these differences in C/No value...

Cognitive radio (CR) systems make efficient use of the frequency spectrum by opportunistically exploiting unoccupied or under–utilized frequency bands. However, the frequency bands used by CR systems are expected to suffer from various forms of noise and interference with non–Gaussian distributions, such as narrowband and co–channel interference caused by the primary user and other CRs, respect...

In this paper, we study slotted Spread Spectrum Aloha with Successive Interference Cancelation at the receiver over a Gaussian channel. We consider a decentralized power control setting in which each user chooses its transmit power independently at random according to a power distribution with continuous support. In this setting, we derive an analytical expression for the expected interference ...

Opposite to many other communication channels the powerline channel does not represent an additive white Gaussian noise (AWGN) environment; in the frequency range from some hundred kilohertz up to 20 MHz it is mostly dominated by narrow-band interference and impulsive noise. After a basic classification of the different types of noise the properties of background noise and narrow-band interfere...

Abstmct-The channel code decoder in a CDMA mobile not accounted for the non-stationary in-cell interference performs channel state estimation to determine the reli-that occuTs on a CDMA fonvard link using concatenated WalshjPN sequence spreading. CDMA forward link chan-ability of each received encoded symbol. This reliability information is typically an estimate of received signal envelope and ...