It is well known that Multiple Input-Multiple Output systems enhance significantly the spectral efficiency of wireless communication systems. However, their remarkable hardware and computational burden hinders the wide deployment of such architectures in modern systems. In this paper, we present an alternative MIMO architecture built on parasitic antenna structures with small inter-element dist...

The multi antenna systems offer a much larger channel capacity than the traditional single antenna systems. The price which has to be extra paid is detection complexity. In this paper we examine performance of the low complexity algorithm called zero forcing–maximum likelihood (ZFML) [5]. We find this algorithm appropriate for MIMO (Multiple Input Multiple Output) systems using more receive tha...

This paper addresses the joint design of transmit and receive antennas or linear processing for multicarrier MIMO channels under a variety of design criteria. Instead of considering each design criterion in a separate way, It is generalized that the existing results by developing an existing unified framework based on considering two families of objective functions that embraced most reasonable...

Hailed as a very important breakthrough in recent times, multiple antenna systems, also called as multiple input multiple output (MIMO) systems have been shown to have enormous gains over conventional systems in point-to-point scenarios for both wireless and wire-line environments. A very important litmus test for the real promise of MIMO systems is in their performance in multi-user scenarios....

This paper presents an analysis on the capacity and performance of MIMO-OFDM systems. The work is focused on the capacity of MIMO-OFDM systems over rician fading channel, in the case of the channel being known at the receiver only, which is more practical case of the channel. Simple expression for capacity is derived for the case of correlated rician fading. The performance of some MIMO-OFDM im...

Four or more streams of MIMO transmission are needed to achieve data rates in excess of 1 Gbps in LTE-Advanced systems. However, accommodating more antennas for four or more streams of MIMO transmission means that a rise in costs and the difficulty of securing the space for additional antennas must be dealt with. This article describes NTT DOCOMO’s new transmission technology, Smart Vertical MI...

We highlight some recent results on the theory and algorithms for MIMO systems, obtained at the Royal Institute of Technology (KTH) within the SATURN project. The paper includes a a new approximate expression for the ergodic channel capacity of a MIMO system with correlated fading, algorithms for MIMO beamforming under EIRP (equivalent isotropic radiated power) constraints and a low-complexity ...

In a more realistic indoor environment we demonstrate the use of the ray tracing method to predict the capacity of a multiple input multiple output(MIMO) indoor wireless communication systems. The channel response for 4 by 4 MIMO systems located inside an office environment operating at 5.2 GHz is constructed by using Wireless InSite, ray tracing simulation tool. The uniform linear array(ULA) a...

In this paper we propose an energy efficient cooperative MIMO system. Space-time block codes (STBC) and code combining techniques are applied to utilize the inherent spatial diversity in wireless cooperative MIMO systems. We form a group of senders and receivers to provide higher order MIMO diversity and implement our STBC scheme in a distributed manner. In the receiving group, code combining i...

Although MIMO antennas is a very promising technology for efficient transmission, the deployment of MIMO systems faces serious challenges mainly because of the limited space and power at mobile terminals (e.g, in 3G and WiMAX systems). In order to achieve the advantages of MIMO systems without installing multiple antennas at the mobile terminals, user cooperation (by relaying signals) can be ut...