نتایج جستجو برای: orthogonal space time block coding

تعداد نتایج: 2503512  

Journal: :IEEE Trans. Information Theory 1999
Vahid Tarokh Hamid Jafarkhani A. Robert Calderbank

We introduce space–time block coding, a new paradigm for communication over Rayleigh fading channels using multiple transmit antennas. Data is encoded using a space–time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbe...

Journal: :JCM 2009
Beata J. Wysocki Tadeusz A. Wysocki Sarah Spence Adams

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. Polarization diversity has also been studied, however it is usually considered in a simple concatenation with oth...

Journal: :The Journal of the Acoustical Society of America 2017
Jing Han Wentao Shi Geert Leus

Orthogonal signal-division multiplexing (OSDM) is a newly emerged modulation scheme which provides a generalized framework unifying conventional orthogonal frequency-division multiplexing (OFDM) and single-carrier frequency domain equalization. In this letter, a space-frequency block coding (SFBC) scheme based on OSDM is proposed for time-varying underwater acoustic channels. The receiver proce...

2002
Hyundong Shin Jae Hong Lee

− Space-time block coding is a modulation scheme for the use of multiple transmit antennas providing a simple transmit diversity scheme with the same diversity order as maximal-ratio receiver combining. Using the equivalent singleinput single-out (SISO) model, we present a closed-form expression for the exact symbol error rate (SER) of orthogonal spacetime block codes (STBCs) over flat Rayleigh...

Journal: :IEICE Transactions 2012
Chanho Yoon Hoojin Lee Joonhyuk Kang

In this letter, we provide an asymptotic error rate performance evaluation of space-time block codes from coordinate interleaved orthogonal designs (STBCs-CIODs), especially in shadowed Rayleigh fading channels. By evaluating a simplified probability density function (PDF) of Rayleigh and Rayleigh-lognormal channels affecting the STBC-CIOD system, we derive an accurate closed-form approximation...

2005
S. A. Ghorashi F. Said A. H. Aghvami Seyed Ali Ghorashi

In this paper we investigate the suitability and performance of space-frequency block coded Multi-band orthogonal frequency division multiplexing (MB-OFDM) system under UWB channel model. The employment of transmit diversity techniques based on block codes is expected to achieve enhancement in such systems since it greatly reduces the detrimental effects of multipath fading. In the proposed MB-...

2003
Aydin Sezgin

We propose a “turbo” coding scheme for the multiple-input multiple-output (MIMO) Rayleigh fading channel consisting of the serially concatenation of a block code as the outer code and different orthogonal space-time block codes (STBC) for more than two transmit antennas as the inner code. Here, we consider the orthogonal STBC as a mapping scheme in space and time. At the receiver, we apply iter...

2007
Chau Yuen Yong Liang Guan Tjeng Thiang Tjhung

Quasi-Orthogonal Space-Time Block Code presents an up-to-date, comprehensive and in-depth discussion of an important emerging class of space-time codes, called the Quasi-Orthogonal STBC (QO-STBC). Used in Multiple-Input Multiple-Output (MIMO) communication systems, they provide transmit diversity with higher code rates than the well-known orthogonal STBC (OSTBC), yet at lower decoding complexit...

Journal: :IEEE Trans. Communications 2000
Hamid Jafarkhani

It has been shown that a complex orthogonal design that provides full diversity and full transmission rate for a space–time block code is not possible for more than two antennas. Previous attempts have been concentrated in generalizing orthogonal designs which provide space–time block codes with full diversity and a high transmission rate. In this work, we design rate one codes which are quasi-...

Journal: :International Journal of Distributed and Parallel systems 2012

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