Results 271 to 280 of about 244,635 (305)

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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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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QPSK space-time turbo codes

2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record, 2002
This paper proposes a class of full space diversity QPSK space-time codes based on parallel concatenated convolutional (turbo) codes. A rank criterion of full space diversity is used in the design. Compared with space-time trellis codes, the simulations show it has robust performance at both a quasi-static fading channel and a time varying fading ...
Youjian Liu, Michael P. Fitz, Oscar Y. Takeshita   +2 more
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Diversity-embedded space-time codes

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2004
Rate and diversity impose a fundamental trade-off in space-time coding. High-rate space-time codes come at a cost of lower diversity, and high reliability (diversity) implies a lower rate. We explore a different point of view where we design high-rate space-time codes that have a high-diversity code embedded within them.
Suhas N. Diggavi, Naofal Al-Dhahir, A. Robert Calderbank   +2 more
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The Aladdin-Pythagoras space-time code

2009 IEEE International Symposium on Information Theory, 2009
Our motivation is the design of space-time coding which is optimal under both maximum likelihood and iterative decoding. We describe the construction of new full-rate space-time codes with non-vanishing determinant that satisfy the genie conditions for iterative probabilistic decoding.
Joseph Jean Boutros, Hugues Randriambololona   +1 more
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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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Exploiting the structure of space-time codes

Proceedings ISCC 2002 Seventh International Symposium on Computers and Communications, 2003
We describe key receiver signal processing algorithms for space-time-coded transmissions over broadband wireless channels. These include channel estimation, equalization, and interference cancellation. Our main theme is exploiting the rich structure of space-time codes to enhance the performance and reduce the complexity of receiver signal processing ...
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Space–Time Coding

2015
In MIMO systems, diversity can be achieved by repetition coding, in which different antennas at the transmitter transmit the same information at different time slots. The space–time (ST) coding is more bandwidth-efficient coding scheme, which transmits an information symbol block in a different order from each antenna.
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