Results 261 to 270 of about 316,357 (300)

Trace-Orthogonal Space-Time Coding

IEEE Transactions on Signal Processing, 2008
In this paper, we prove that, in MIMO systems affected by flat fading, when the channel is unknown at the transmitter and known at the receiver side, a space-time code does not induce any information loss, regardless of the channel realization, if and only if it is a trace-orthogonal design (TOD).
Antonio Fasano, BARBAROSSA, Sergio
openaire   +2 more sources

Universal space-time trellis codes

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE, 2003
This article gives practical examples of space-time trellis codes performing as predicted by Root and Varaiya's (1968) compound channel theorem. Specifically, 32-state and 64-state 2/spl times/2 space-time trellis codes are presented that provide a bit-error rate (BER) of 10/sup -5/ on all 2/spl times/2 matrix channels with an excess mutual information
Cenk Köse, Richard D. Wesel
openaire   +1 more source

On the robustness of space-time coding

IEEE Transactions on Signal Processing, 2002
Space-time (ST) coding has emerged as one of the most promising technologies for meeting the challenges imposed by the wireless channel. This technology is primarily concerned with two-dimensional (2-D) signal design for multitransmit antenna wireless systems. Despite the progress in ST coding, several important questions remain unanswered.
openaire   +1 more source

Distributed space-time block coding

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005
In this paper, a new class of distributed space-time block codes (DSTBCs) is introduced. These DSTBCs are designed for wireless networks which have a large set of single-antenna relay nodes Nscr, but at any given time only a small, a priori unknown subset of nodes SsubeNscr can be active.
Simon Yiu, Robert Schober, Lutz Lampe
openaire   +1 more source

Space-Time Coding

2005
This book covers the fundamental principles of space-time coding for wireless communications over multiple-input multiple-output (MIMO) channels, and sets out practical coding methods for achieving the performance improvements predicted by the theory.
openaire   +1 more source

Performance of space-time block coding and space-time trellis coding for impulse radio

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04., 2005
Ultra wideband (UWB) systems have attracted a lot of research interest lately, owing to their appealing features in short-range mobile communications. These features include low power peer-to-peer transmissions, multiple access communications, high data rates, and precise positioning capabilities.
Heliot, F, Ghavami, M, Nakhai, M R, Aghvami, A H   +3 more
openaire   +1 more source

Space–time trellis codes for MSK

Computers & Electrical Engineering, 2005
This paper presents four-state and eight-state space-time minimum shift keying (MSK) trellis codes with full-rate and full-diversity. Codes with two and three transmit antennas are proposed for small and large diversity orders and simulated on a quasi-static Rayleigh fading channel when the numbers of received antennas are one and four.
openaire   +2 more sources

A GRASP for unitary space-time codes

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005
Unitary space-time codes perform well at high signal-to-noise ratios on MIMO channels even when the propagation coefficients between transmitter and receiver are unknown. One method of constructing unitary space-time constellations uses a random search to find signal constellations that minimize the maximum pairwise correlation between transmitted ...
Adam Panagos, Kurt L. Kosbar
openaire   +1 more source

Spherical space-time codes (SSTC)

IEEE Communications Letters, 2001
We present the extension of the trellis space-time code (STC) concept to include signal mapping drawn from an N-dimensional sphere. The signal points were designed as such to increase the minimum squared distance between points in the constellation without increasing the average transmit energy. The mapping of the N-dimensional spherical constellations
John D. Terry, Juha Heiskala
openaire   +1 more source

On MIDO Space-Time Block Codes

2007 IEEE International Symposium on Information Theory, 2007
In this paper, the need for the construction of multiple input-double output (MIDO) space-time block codes (STBCs) is discussed, concentrating on the case of four transmitters for simplicity. Above the trivial method, i.e. switching off the extra layers in the usual multiple input-multiple output (MIMO) setting, two smarter yet simple MIDO construction
Camilla Hollanti, Kalle Ranto
openaire   +1 more source