Results 251 to 260 of about 1,055,903 (287)

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.
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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
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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.
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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
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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
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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.
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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
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Quaternionic lattices for space-time coding

Proceedings 2003 IEEE Information Theory Workshop (Cat. No.03EX674), 2004
We propose an algebraic framework for studying coherent space-time codes, based on arithmetic lattices on central simple algebras. For two transmit antennas, this algebra is called a quaternion algebra. For this reason, we call these lattices quaternionic lattices. The design criterion is the one described by V. Tarokh et al. (see IEEE Trans.
Jean-Claude Belfiore, Ghaya Rekaya
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Relaxed threaded space-time codes

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005
It is well-known that diversity, despite being widely used as a design criterion, may not be enough to ensure good performance of a wireless system, because the diversity factor may "kick in" at unrealistically high values of SNR. This paper proposes a new class of layered space-time codes with a new design criterion that works well in moderate SNR's ...
Mohammad Janani, Aria Nosratinia
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Differential turbo space-time coding

Proceedings 2001 IEEE Information Theory Workshop (Cat. No.01EX494), 2002
Serial concatenation of standard convolutional or block codes with differential space-time modulation is considered for flat fading multiple antenna channels. Extrinsic information transfer is used to predict thresholds for various outer codes. Using the differential structure of the inner code near coherent performance is obtained without the use of ...
Alex J. Grant, Christian Schlegel
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