Filters








16,736 Hits in 7.7 sec

Square-matrix embeddable space-time block codes for complex signal constellations

O. Tirkkonen, A. Hottinen
2002 IEEE Transactions on Information Theory  
Space-time block codes for providing transmit diversity in wireless communication systems are considered.  ...  Based on the principles of linearity and unitarity, a complete classification of linear codes is given in the case when the symbol constellations are complex, and the code is based on a square matrix or  ...  ACKNOWLEDGMENT The authors wish to thank Dr. R. Kashaev, Dr. K. Kalliojärvi, and Dr. P. Pasanen for conversations on the subject of this paper.  ... 
doi:10.1109/18.978740 fatcat:qz7gnqvauvh7tmyoqqziggyxoq

Explicit-form complex orthogonal design for space-time block codes

Yuan Li, Chen Yuan, HaiBin Kan
2012 Science China Information Sciences  
In this paper, we present a construction of complex orthogonal design for space-time block codes in any number of antennas. Our construction achieves both the maximal rate and minimal delay.  ...  So far as we know, our construction is the first explicit-form construction, which has asymptotically optimal time complexity and space complexity.  ...  In [4] , Liang systematically investigated the maximal rates of space-time codes from complex orthogonal designs.  ... 
doi:10.1007/s11432-012-4576-9 fatcat:xsc6335h6jb6lbnhnqe27fjbly

Upper bounds of rates of complex orthogonal space-time block codes

Haiquan Wang, Xiang-Gen Xia
2003 IEEE Transactions on Information Theory  
In this correspondence, we derive some upper bounds of the rates of (generalized) complex orthogonal space-time block codes.  ...  We first present some new properties of complex orthogonal designs and then show that the rates of complex orthogonal space-time block codes for more than two transmit antennas are upper-bounded by 3 4  ...  In particular, one of the referees pointed out references [15] and [14] to the authors, which has led them to study the restricted (pseudo) orthogonal designs.  ... 
doi:10.1109/tit.2003.817830 fatcat:cbqaybxadvbydicmfmg5nbdwie

Orthogonal space-time block codes with sphere packing

Weifeng Su, Zoltan Safar, K.J. Ray Liu
2009 IEEE Transactions on Information Theory  
Space-time block code construction from block-orthogonal designs is also considered: the full-diversity property is ensured by rotating the sphere packing underlying the code, and the optimal rotation  ...  In this paper, we propose a class of space-time block codes constructed by combining orthogonal designs with sphere packing for an arbitrary number of transmit antennas.  ...  The encoder divides the input bit stream into bit long blocks, and for each block, it selects one space-time codeword from the codeword set of size .  ... 
doi:10.1109/tit.2009.2013027 fatcat:sn52yfdlxvc75gpv5ao3n5xj2u

The maximal rates and minimal decoding delay of more general complex orthogonal designs

Yuan Li, HaiBin Kan, Chen Yuan, HuanFei Ma
2010 Science China Information Sciences  
Space-time block codes based on complex orthogonal design have been widely investigated for their remarkable performance.  ...  Keywords space-time block codes, complex orthogonal design, more general complex orthogonal design, maximal rates, minimal delays Citation Li Y, Kan H B, Yuan C, et al.  ...  criterion of space-time block codes.  ... 
doi:10.1007/s11432-010-4038-1 fatcat:7fl4sx2y6vfahpo7rl53ydxdze

Page 10568 of Mathematical Reviews Vol. , Issue 2004m [page]

2004 Mathematical Reviews  
We first present some new properties of complex orthogonal designs and then show that the rates of complex orthogonal space- time block codes for more than two transmit antennas are upper- bounded by 3  ...  Summary: “In this correspondence, we derive some upper bounds of the rates of (generalized) complex orthogonal space-time block codes.  ... 

Rate-One Space–Time Block Codes With Full Diversity

L. Xian, H. Liu
2005 IEEE Transactions on Communications  
Orthogonal space-time block codes provide full diversity, and maximum-likelihood (ML) decoding for orthogonal codes can be realized on a symbol-by-symbol basis.  ...  In this letter, we provide a systematic method of designing rate-one codes (real or complex) for a general multiple-input multiple-output system.  ...  The transmit diversity scheme proposed by Alamouti [1] is a simple and effective orthogonal space-time block code (STBC) of rate one for systems with two transmit antennas.  ... 
doi:10.1109/tcomm.2005.860081 fatcat:tjyjtfioircsfl6uauonib64be

Differential space-time modulation over frequency-selective channels

Hongbin Li
2005 IEEE Transactions on Signal Processing  
A unitary structure is imposed on the differential encoder to admit linear, decoupled maximum likelihood (ML) detection in space and time.  ...  Numerical results are presented to illustrate the performance of the proposed DSTF modulation and coding scheme, which compares favorably with several existing differential space-time schemes in frequency-selective  ...  Our interest here is to utilize them for differential space-time transmission. We consider complex block orthogonal designs in our case. A.  ... 
doi:10.1109/tsp.2005.847853 fatcat:buvfuk7zfjf2tbiixr2gcxelty

Fast Optimal Decoding of Multiplexed Orthogonal Designs by Conditional Optimization

Songsri Sirianunpiboon, Yiyue Wu, A. Robert Calderbank, Stephen D. Howard
2010 IEEE Transactions on Information Theory  
It is independent of implementation and is more general in that it can be applied to space-time codes such as the Golden Code and perfect space-time block codes, that are not assisted by quasi-orthogonality  ...  This paper focuses on conditional optimization as a decoding primitive for high rate space-time codes that are obtained by multiplexing in the spatial and code domains.  ...  Consider the rate 3/4 complex orthogonal space-time code with 4 transmit antennas given by (54) If we multiplex this -rate code, we obtain a new code (55) with rate .  ... 
doi:10.1109/tit.2009.2039069 fatcat:z7zotzbrvfcu7b3alzmoytztb4

Optimal rotation angles for quasi-orthogonal space-time codes with PSK modulation

Liang Xian, Huaping Liu
2005 IEEE Communications Letters  
Full diversity of quasi-orthogonal space-time block codes with complex signals could be achieved by constellation rotation.  ...  In this letter, we derive the optimal rotation angle in the sense of maximizing coding gain for quasi-orthogonal codes with phase-shift keying (PSK) modulation using a geometrybased approach.  ...  Optimal Rotation Angles for Quasi-Orthogonal Space-Time Codes with PSK Modulation Liang Xian and Huaping Liu, Member, IEEE Abstract-Full diversity of quasi-orthogonal space-time block codes with complex  ... 
doi:10.1109/lcomm.2005.1496579 fatcat:cl3rklqkjrennecqxdrfplnqbu

Super-orthogonal space-time trellis codes

H. Jafarkhani, N. Seshadri
2003 IEEE Transactions on Information Theory  
We introduce a new class of space-time codes called super-orthogonal space-time trellis codes.  ...  These codes combine set partitioning and a super set of orthogonal space-time block codes in a systematic way to provide full diversity and improved coding gain over earlier space-time trellis code constructions  ...  ACKNOWLEDGMENT The authors wish to thank the anonymous reviewers and Dr. Marvin Simon for their comments that have improved the presentation of the paper.  ... 
doi:10.1109/tit.2003.809607 fatcat:max65c4cbza75a5x52j7wcphtq

A new non-orthogonal space-time code with low decoding complexity

M.A. Maddah-Ali, A.K. Khandani
2006 IEEE Transactions on Wireless Communications  
A full diversity block space-time code over two transmit antennas and two symbol periods is introduced.  ...  In this method, each code is equal to the addition of two matrices; ¢ ¤ £ and ¥ ¦ ¢ § , where ¢ and ¥ are the two constant matrices and © and are the two data symbols.  ...  Block orthogonal space-time coding is another method of designing full diversity space-time codes with an orthogonality property which simplifies decoding [5] [15] .  ... 
doi:10.1109/twc.2006.1633364 fatcat:gggymcp66fczplv4heoosrtrey

Diagonal algebraic space-time block codes

M.O. Damen, K. Abed-Meraim, J.-C. Belfiore
2002 IEEE Transactions on Information Theory  
The codes maintain their rate, diversity, and coding gains for all real and complex constellations carved from the complex integers ring [ ], and they outperform the codes from orthogonal design when using  ...  We construct a new family of linear space-time (ST) block codes by the combination of rotated constellations and the Hadamard transform, and we prove them to achieve the full transmit diversity over a  ...  ACKNOWLEDGMENT The authors are grateful to the anonymous reviewers for many helpful comments. M. O. Damen wishes to thank Prof. H. El Gamal and Prof. N. Beaulieu for many helpful discussions.  ... 
doi:10.1109/18.985979 fatcat:voqsbiflgfby3czkoozpbdc7ki

Super-quasi-orthogonal space-time trellis codes for four transmit antennas

H. Jafarkhani, N. Hassanpour
2005 IEEE Transactions on Wireless Communications  
We consider a family of quasi-orthogonal space-time block codes as building blocks in our new trellis codes.  ...  We introduce a new family of space-time trellis codes that extends the powerful characteristics of super-orthogonal space-time trellis codes to four transmit antennas.  ...  ACKNOWLEDGMENT The authors would like to thank Dr. Q. Yan for providing the simulation results of a space-time code in [17] .  ... 
doi:10.1109/twc.2004.840247 fatcat:fnrkkfnm2ncrhox6aq6hpiw3di

Space-time overlays for convolutionally coded systems

H. El Gamal, A.R. Hammons, A. Stefanov
2003 IEEE Transactions on Communications  
We also investigate a concatenated coding approach for BPSK overlay design in which the inner code is an orthogonal block code.  ...  The signals transmitted from the remaining antennas are designed according to space-time coding principles to achieve full spatial diversity in quasi-static flat fading channels.  ...  We also investigated the use of orthogonal designs as inner space-time block codes that achieve full spatial diversity [5] .  ... 
doi:10.1109/tcomm.2003.815082 fatcat:l4zdi52ninadboqh6yz4tkc6tu
« Previous Showing results 1 — 15 out of 16,736 results