Abstract: Multiuser multiple-input multiple-output (MIMO) downlink (DL) transmission schemes experience both multiuser interference as well as inter-antenna interference. Instead of treating all the users jointly as in zero-forcing (ZF) multiuser transmission techniques, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO system takes the individual user’s channel cha...

Multi-user multi-input multi-output (MIMO) system has been attracting much attention due to its high spectrum efficiency. Nonlinear MIMO signal detection methods with less computational complexity have been widely studied for single-user MIMO systems. In this paper, we investigate how a lattice reduction (LR)-aided detection and a maximum likelihood detection (MLD) employing the QR decompositio...

The channel capacity of the indoor multiple input multiple output (MIMO) system is investigated with consideration of the effects of the wall by using a hybrid method of the finite difference time domain (FDTD) method and the method of moments (MoM). Firstly, the effects of wall material on indoor MIMO channel capacity are investigated according to the physical parameters of the wall, i.e. the ...

Future mobile communication systems will be based on a combination of MIMO and OFDM. For the design of MIMO techniques system simulations are an important tool, if they accurately predict behaviour in reality. For the realistic inclusion of high power amplifier (HPA) behaviour, this paper describes a measurement procedure as well as the adaptation to behavioural modeling. The amplifier model is...

Abstract: Massive MIMO has an important role in 5G and IoT, however provides hardware problems in the system. To reduce these challenges we introduce a method for channel matrix rank reduction which reduces the computations volume in a m×n MIMO system using space – time coding in this paper. We used this method to 4×2 system to change its rank to 2×2, however it may be used to any desirable hig...

In recent years, multiple-input multiple-output (MIMO) antennas systems have quickly become an inevitable wireless technology not only for WLANs but also for mobile networks. Based on the benefits of using multiple transmit antennas and multiple receive antennas, MIMO systems can provide high quality and high speed services. However, for high speed transmission, frequency-selective fading (FSF)...

This paper investigates the performance of MultipleInput Multiple-Output (MIMO) feedback system combined with Orthogonal Frequency Division Multiplexing (OFDM). Two types of codebook based channel feedback techniques are used in this work. The first feedback technique uses a combination of both the long-term and short-term channel state information (CSI) at the transmitter, whereas the second t...

With the growing popularity of ad-hoc sensor networks, spatially distributed MIMO systems have drawn a lot of attention. This work considers a spatially distributed MIMO system with randomly distributed transmit and receive antennas over spatial regions. We use the modal decomposition of wave propagation to analyse the performance limits of such system, since the sampling of the spatial regions...

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...

This paper describes the experimental characterisation of MIMO propagation channels. The requirements for the measurement system are discussed and the developed system is described. At the second part of the paper the analysis methods of MIMO measurement results are introduced and results are presented both for outdoor and indoor for several different antenna configurations. The significance of...