The Alamouti space-time code for transmission diversity is extended recursively to 2n×2n antenna elements as well as to unsymmetrical arrays of the size m × n. The proposed schemes exhibit two significant advantages: they allow for higher diversity (of degree 2 for the symmetrical case) and at the same time can be implemented as zero-forcing or MMSE type at low complexity avoiding any matrix in...

Multiple-Input multiple-output (MIMO) technology is capable of enhancing capacity and coverage of wireless links. Implementation of MIMO devices is intricate because of the increased number of radio frequency chains (one for each antenna element). Antenna selection is one attractive approach to mitigate this requirement. It only utilizes an optimal subset of all available antennas, adapting it ...

| The use of multiple transmitter and receiver antennas allows to transmit multiple signal substreams in parallel and hence to increase communication capacity. In order to distribute the multiple signal substreams over the MIMO channel, linear spacetime codes have been shown to be a convenient way to reach high capacity gains with a reasonable complexity. The space-time codes that have been int...

Diversity techniques are very effective tools to increase signal reception quality in Rayleigh fading channels. A well-known method to increase diversity in multi-input multi-output (MIMO) communication is transmit antenna selection (TAS). However, TAS is very sensitive to feedback errors. One of the alternative techniques to TAS is balanced space-time block coding (BSTBC) which guarantees full...

In the spirit of BLAST systems, this paper proposes a novel layered space-time (ST) coding scheme. By slicing the two-dimensional ST code into a stack of one-dimensional so-called layer codes, ST coding and decoding are performed in a layer by layer fashion. Because d$erent layers are transmitted independently, the proposed scheme is capable of supporting considerably higher transmission rates ...

Wireless networks have quickly become part of everyday life. Wireless LANs, cell phone networks, and personal area networks are just a few examples of widely used wireless networks. However, wireless devices are range and data rate limited. The research community has spent a great deal of effort on finding ways to overcome these limitations. One method is to use Multiple-Input Multiple-Output (...

HONG, ZHIHONG. Robust Coding Methods For Space-Time Wireless Communications. (Under the direction of Dr. Brian L. Hughes.) Space-time coding can exploit the presence of multiple transmit and receive antennas to increase diversity, spectral e±ciency, and received power, to improve the performance in wireless communication systems. Thus far, most work on space-time coding has assumed highly ideal...

pour toute la sympathie qu'ils ont offert pendant mes séjours en Bretagne. Je remercie tous lescolì egues et amis du département COMELEC de l'ENST :Danì ele, Marc Fossorier de l'Université d'Hawaii, Emanuele Viterbo du Politecnico di Torino pour toutes les discussions techniques fructueuses et motivantes, et pour leur soutien inconditionnel. Bien ´ evidemment, je remercie toute l'´ equipe des t...

A joint scheme combining error-control coding (ECC) with complex-field coding (CFC) is proposed for space-time communications through flat or frequency-selective fading multiple-input multiple-output (MIMO) channels. It is shown that the diversity gain of this joint coding scheme is the product of the free distance of the ECC, the complex-field block encoder size, and the number of receive ante...

Recently unitary space-time modulation has been presented to give a solution to more reliable multiple antennas communications. Good-performing unitary constellations are required to be designed to fit into this system. Although the basic principle is well understood and certain criteria and their transformations for designing such constellations have been presented, we don’t have a general met...