Multiple antennas at the transmitter and receiver can achieve enormous capacities by transmitting on the channel’s eigenmodes when the channel realization is known at the transmitter. If the transmitter has no knowledge of the channel, a significant fraction of the eigenmode capacity can be achieved in an open-loop mode, but multidimensional coding is required. In this paper, we show how the op...

M. Pregelj,1 A. Zorko,1 H. Berger,2 H. van Tol,3 L. C. Brunel,3 A. Ozarowski,3 S. Nellutla,3 Z. Jagličič,4 O. Zaharko,5,* P. Tregenna-Piggott,5 and D. Arčon1,6,† 1Institute Jozef Stefan, Jamova 39, 1000 Ljubljana, Slovenia 2Institute of Physics of Complex Matter, EPFL, 1015 Lausanne, Switzerland 3High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA 4Institute of Mathematics, Physics ...

Space-time coding and multiple-input, multipleoutput wireless system promise to deliver higher data rates with higher reliability than traditional systems, with no increase on transmit power or bandwidth. In this expository paper, we present multiple-antenna systems and their ability to increase the number of dimensions that may be transmitted per channel use. We present two space-time codes, o...

An analytical study of the dispersion of transient stress waves in the first layer of a weakly coupled semi-infinite bi-layered system is carried out. The analysis is based on approximate Fourier transform inversions, and makes use of the fact that the weakly coupled system possesses small propagation zones (PZs) in the frequency domain. Lowand high-frequency asymptotic approximations to the tr...

This letter presents a new vertical Bell Labs layered spacetime (V-BLAST) transmission scheme for developing low-complexity tree searching in the QRD-M algorithm. In the new V-BLAST system, we assign modulation scheme in ascending order from top to bottom tree branches. The modulation set to be assigned is decided by two criteria: minimum performance loss and maximum complexity reduction. We al...

Space-time (ST) coding techniques exploit the spatial diversity afforded by multiple transmit and receive antennas to achieve reliable transmission in scattering-rich environments. ST block codes are capable of realizing full diversity and spatial coding gains at relatively low rates; ST trellis codes can achieve better rate-diversity tradeoffs at the cost of high complexity. On the other hand,...

Security mechanisms are at the base of modern computer systems, demanded to be more and more reactive to changing environments and malicious intentions. Security policies unable to change in time are destined to be exploited and thus, system security compromised. However, the ability to properly change security policies is only possible once the most effective mechanism to adopt under specific ...

Designing security-critical systems correctly is very difficult and there are many examples of weaknesses arising in practice. A particular challenge lies in the development of layered security protocols motivated by the need to combine existing or specifically designed protocols that each enforce a particular security requirement. Although appealing from a practical point of view, this approac...

Three widely-available surface wave measurement techniques, including two active-source methods, the Spectral Analysis of Surface Waves (SASW) method and the Multi-channel Analysis of Surface Waves (MASW) method, and one passive-source method, the Refraction Microtremor (ReMi) method, were applied at a complex-layered site. Dispersion relations were compared to one another. Outcomes from the MA...

Persistent threads are a database programming concept particularly well-suited for a.pplications that manage long-term, distributed or cooperative activities. We introduce persistent threads as a novel form of bindings from data in persistent object stores to activated code and relate them to existing binding concepts found in database programming. We also describe the integration of persistent...