Results 231 to 240 of about 18,605,265 (278)

On diagonal algebraic space-time block codes

IEEE Transactions on Communications, 2003
Theoretical and practical aspects of diagonal algebraic space-time block codes over n transmit and m receive antennae are examined. These codes are obtained by sending a rotated version of the information symbols over the principal diagonal of the n /spl times/ n space-time matrix over n transmit antennae and n symbol periods.
Mohamed Oussama Damen, Norman C. Beaulieu   +1 more
openaire   +1 more source

Space-time block codes: a capacity perspective

IEEE Communications Letters, 2000
Space-time block codes are a remarkable modulation scheme discovered recently for the multiple antenna wireless channel. They have an elegant mathematical solution for providing full diversity over the coherent, flat-fading channel. In addition, they require extremely simple encoding and decoding.
Sumeet Sandhu, Arogyaswami Paulraj
openaire   +2 more sources

On an Orthogonal Space-Time-Polarization Block Code

Journal of Communications, 2009
Over the past several years, diversity methods such as space, time, and polarization diversity have been successfully implemented in wireless communications systems. Orthogonal space-time block codes efficiently combine space and time diversity, and they have been studied in detail.
Beata J. Wysocki, Tadeusz A. Wysocki, Sarah Spence Adams   +2 more
openaire   +2 more sources

Nonlinear hierarchical space-time block codes

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2004
Recent designs for space-time block codes (STBCs) have exploited the structure of the codes (unitary, orthogonal) to enable systematic construction. Code sets found by an exhaustive search to optimize cost functions can often achieve performance gains of several dB; however, such searches are not feasible for large block or constellation sizes.
Jifeng Geng, Urbashi Mitra
openaire   +2 more sources

Closed loop space-time block code

IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211), 2002
In 3GPP FDD specifications, space time transmit diversity (STTD) employs space-time block code (STBC) to maintain orthogonality between the two antennas in order to avoid self-interference in fading channels. However, the STTD technique is just open loop transmit diversity, and we investigate whether we can obtain further gain if closed loop STBC is ...
Xiaofeng Tao 0001, Harald Haas, Zhuizhuan Yu, Haiyan Qin, Ping Zhang 0003   +4 more
openaire   +1 more source

Orthogonal Space-Time Block Codes with Feedback

Wireless Personal Communications, 2004
In this paper we consider how Orthogonal Space-Time Block Codes (OSTBC) can be used in the presence of feedback from the receiver to the transmitter. First, we survey how some of the feedback techniques for AWGN channels with fading can be applied to OSTBC. Then we consider a simple scheme with diagonal weighting. The optimal diagonal weighting matrix,
Girish Ganesan, Petre Stoica, Erik G. Larsson   +2 more
openaire   +1 more source

Patched Distributed Space-Time Block Codes

2010 IEEE International Conference on Communications, 2010
In this paper, we propose Patched Distributed Space-Time Block Codes (DSTBC) for the Dynamic Decode and Forward (DDF) Relaying protocol, in which the relay transmits combination of information from the first and second phase of the DDF protocol, and the destination makes a linear combination of symbols received in the two phases.
Mélanie Plainchault, Nicolas Gresset, Ghaya Rekaya-Ben Othman   +2 more
openaire   +2 more sources

Space-time block codes based on precoding

GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489), 2004
We propose a space-time block coding framework based on precoding. The code design is aimed to the tradeoff between rate, diversity and complexity. Specifically, for P transmit antennas, our block codes are based on L distinct precoding matrices, where L/spl les/P.
Zhihong Hong, Akbar M. Sayeed
openaire   +2 more sources

Shift-orthogonal space-time block codes

IEEE Transactions on Communications, 2010
In this paper, we present a new class of spacetime block code, called shift-orthogonal space-time block codes (SOSTBC), which can maintain orthogonality (hence symbolwise linear decoding) in asynchronous wireless relay networks, under both amplify-and-forward (AF) and decode-and-forward (DF) relaying schemes.
Tian Peng Ren, Yong Liang Guan 0001, Erry Gunawan, Er Yang Zhang   +3 more
openaire   +2 more sources

Space-time block codes for noncoherent CPFSK

IEEE Transactions on Wireless Communications, 2010
In this paper the problem of space-time block coding for multiple-input multiple-output communication systems employing continuous phase frequency shift keying and one-shot noncoherent detection is investigated. First, the detection problem is analysed in a maximum likelihood perspective; then, design criteria for optimal space-time codes are proposed ...
PANCALDI, Fabrizio, BARBIERI, Alessandro, VITETTA, Giorgio Matteo   +2 more
openaire   +3 more sources