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We present a link adaptation strategy for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based wireless communications. Our objective is to choose the optimal mode that will maximize energy efficiency or data throughput subject to a given quality of service (QoS) constraint. We formulate the link adaptation problem as a convex optimization problem and expand...
In this paper, we present a space time block coded (STBC) MIMO-OFDM scheme for indoor UWB using whose channel is frequency selective because of full of multipaths. After briefly introducing transmit diversity of MIMO-OFDM, we give out STBC scheme which can achieve space and frequency diversity gain. Numerical simulation results show that in the UWB environment, the performance of the STBC MIMO-OFDM...
As the demand of high quality service in next generation wireless communication systems, a high performance of data transmission requires an increase of spectrum efficiency and an improvement of error performance in wireless communication systems. In this paper, we propose a multi-user multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with cyclic delay...
As the demand of high quality service in next generation wireless communication systems, a high performance of data transmission requires an increase of spectrum efficiency and an improvement of error performance in wireless communication systems. In this paper, we propose a multi-user multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with cyclic delay...
Recently, to meet higher data rate requirements, LDPC coded MIMO-OFDM systems are investigated widely. Multiple-input multiple-output (MIMO) wireless technology in combination with orthogonal frequency division multiplexing (OFDM) is an attractive solution for next-generation wireless local area networks (WLANs). Space-time block coded OFDM is capable of achieving substantial diversity gains, while...
Recently, the turbo-detected sphere packing (SP) aided space-time block-coding (STBC) STBC-SP scheme was demonstrated to provide useful performance improvements over conventionally-modulated orthogonal design based STBC schemes in the context of single-user multiple-input multiple-output (SU-MIMO) systems. Hence, in this treatise we extend its employment to the multi-user MIMO (MU-MIMO) scenario....
This paper presents a design methodology and resulting schemes for space-time-frequency (STF) coding and linear preceding of downlink multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) modulated wireless systems, based on practical hypotheses. In particular, the design takes into account the fact that the receiver implements STF minimum mean square error (MMSE)...
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