This report investigates channel modeling and estimation for a wired multiuser multicarrier communications system. The special case of a multiple-input multiple-output (MIMO) channel is considered where the different users transmit at the same time and over the same bandwidth. In the report, I will introduce data transmission and training systems. The report also will present a MIMO channel mod...

Multiple antenna wireless systems are of practical interest because of their ability to provide improved capacity over single antenna wireless systems [1]. Weighting of sufficiently spaced antennas has long been used in receive diversity combiners for singleinput multiple-output (SIMO) wireless systems [2]. When the transmitter has channel knowledge, the extension of the SIMO weighting method t...

This paper evaluates the performance of Satellite communication system. Different data modulation techniques are tested and analyzed to select the optimum modulation scheme. Different channels as AWGN, Rayleigh and Rician channel models are implemented and evaluated with various channel estimation techniques as, Least Square (LS), Least Square-Modified (LS-Mod) and Minimum Mean Square Error (MM...

We consider a sampling scheme where a set of multiband input signals are passed through a MIMO liner time-invariant system and the outputs are sampled. MIMO sampling is a very general scheme that encompasses various other schemes, including Papoulis’ generalized sampling and nonuniform sampling as special cases. We present necessary density conditions for stable MIMO sampling. These results gen...

Antenna (subset) selection techniques are feasible to reduce the hardware complexity of multiple-input multiple-output (MIMO) systems, while keeping the benefits of higher-order MIMO systems. Many studies of antenna selection schemes are based on frequency-flat channel models, which are inconsistent to broadband MIMO systems employing spatial-multiplexing. In broadband MIMO systems aiming to pr...

The capacity of Multiple Input Multiple Output (MIMO) systems has received much attention in recent years. In this paper, we analyse the capacity of MIMO systems for the 3GPP-3GPP2 Spatial Channel Model (SCM). We examine the impact of number of antennas, inter-element distance and mutual coupling, assuming both waterfilling and uniform transmit power allocation schemes, for different SCM scenar...

This paper describes overview and definitions about Multiple Input Multiple Output (MIMO) formats which can be used in hybrid Free Space Optics/Radio Frequency (FSO/RF) links. Free space optical links allow obtain high speed data transmission without optical fibers. This type of communication is dependent on weather properties and line of sight is needed. This fact has negative influence on inf...

In this paper we present a methodology for the feedforward minimumtime regulation of Multiple-Input-Multiple-Output (MIMO) square linear systems. The aim is to synthesize bounded smooth input functions, subject to nonsaturating constraints on the inputs and their derivatives until an arbitrary predefined order, in order to provide given transitions of the outputs. The posed problem yields to th...

In this article, we identify some of the key problems that may be encountered when designing Non-Coherent (NC) Multiple-Input Multiple-Output (MIMO) DownLink (DL) synchronisation schemes for communicating over multi-path fading channels. Our main objectives are to illustrate the information theoretic features and to provide design guidelines for the initial synchronisation of NC MIMO systems. W...

Multiple Input, Multiple Output (MIMO) technology offers the potential for a significant increase in capacity and performance within a given bandwidth and power budget. However, these benefits must be weighed against the cost of the multiple RF front ends and additional processing necessary in supporting MIMO systems. The creation of a cost effective MIMO system can be facilitated through the u...