1,063 research outputs found
Vulnerability of LTE to Hostile Interference
LTE is well on its way to becoming the primary cellular standard, due to its
performance and low cost. Over the next decade we will become dependent on LTE,
which is why we must ensure it is secure and available when we need it.
Unfortunately, like any wireless technology, disruption through radio jamming
is possible. This paper investigates the extent to which LTE is vulnerable to
intentional jamming, by analyzing the components of the LTE downlink and uplink
signals. The LTE physical layer consists of several physical channels and
signals, most of which are vital to the operation of the link. By taking into
account the density of these physical channels and signals with respect to the
entire frame, as well as the modulation and coding schemes involved, we come up
with a series of vulnerability metrics in the form of jammer to signal ratios.
The ``weakest links'' of the LTE signals are then identified, and used to
establish the overall vulnerability of LTE to hostile interference.Comment: 4 pages, see below for citation. M. Lichtman, J. Reed, M. Norton, T.
Clancy, "Vulnerability of LTE to Hostile Interference'', IEEE Global
Conference on Signal and Information Processing (GlobalSIP), Dec 201
Wireless Cellular Networks
When aiming for achieving high spectral efficiency in wireless cellular networks, cochannel interference (CCI) becomes the dominant performancelimiting factor. This article provides a survey of CCI mitigation techniques, where both active and passive approaches are discussed in the context of both open- and closed-loop designs.More explicitly, we considered both the family of flexible frequency-reuse (FFR)-aided and dynamic channel allocation (DCA)-aided interference avoidance techniques as well as smart antenna-aided interference mitigation techniques, which may be classified as active approach
Enhanced Trellis Coded Multiple Access (ETCMA)
We propose an enhanced version of trellis coded multiple access (TCMA), an
overloaded multiple access scheme that outperforms the original TCMA in terms
of achieved spectral efficiency. Enhanced TCMA (ETCMA) performs simultaneous
transmission of multiple data streams intended for users experiencing similar
signal-to-noise ratios and can be employed both in the uplink and in the
downlink of wireless systems, thus overcoming one of the main limitations of
TCMA. Thanks to a new receiver algorithm, ETCMA is capable of delivering a
significantly higher spectral efficiency. We show that ETCMA approaches the
capacity of the Additive White Gaussian Noise channel for a wide range of
signal-to-noise ratios.Comment: 5 pages, 5 figure
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