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Multiple-Input Multiple-Output (MIMO) techniques have recently become an important research field for enhancing the performance of in-home Power Line Communication (PLC) systems by exploiting the additional Protective Earth wire. The development of such systems requires an accurate description of the propagation channel. This paper presents a statistical model for the MIMO PLC channel, based on an...
Being reliable and real-time, are the two most challenging requirements of wireless sensor and actuator networks (WSAN) due to the shared, error-prone and nondeterministic behaviour of wireless communication medium. In this paper, an adaptive data-rate and space-time coding (STC) scheme has been proposed for the IEEE 802.11-based Soft-Real-Time WSAN's utilizing Enhanced Distributed Channel Access...
In downlink Multiuser Multiple-Input Multiple-Output (MU-MIMO) systems, the zero-forcing (ZF) transmission is a simple and effective technique for separating users and data streams of each user at the transmitter side, but its performance depends greatly on the accuracy of the available channel state information (CSI) at the transmitter. Due to the existence of the CSI delay and channel estimation...
One of the main challenges in wireless industrial networks is the delay caused by shared, error-prone and non-deterministic behaviour of wireless communication medium. In this paper, a cross-layer adaptive space-time coding scheme has been proposed for the multiple-input multiple-output (MIMO) based IEEE 802.11 Soft-Real-Time Wireless Industrial Networks. Using this technique, packet delay for real-time...
The performance of orthogonal frequency division multiplexing/code-division multiple-access (OFDM/CDMA) system is featured by the resistance to frequency selective fading and the support of multiple user access. However, OFDM/CDMA system suffers from multiple-access interference (MAI) and doubly selective fading in highly mobile channel. Based on basis expansion model (BEM), this paper proposes a...
Delay selection has notoriously a dramatic impact on the equalizer performance. We prove that near-optimal performance can be obtained by choosing the delay to be equal or slightly larger than the channel memory. This results is proved in the general context of a multiple-input multiple-output finite impulse response channels. It constitutes a helpful design criterion that ensures practically optimal...
In future fourth generation wireless networks OFDM and MIMO techniques will be heavily exploited to provide connectivity to heterogeneous users offering different data traffic types. This paper proposes a low complexity resource allocation strategy for MIMO-OFDMA (Multiple-Input Multiple-Output Orthogonal Frequency Division Multiple Access) broadcast channel to support delay-sensitive traffic with...
The use of multiple antennas at both the transmitter and receiver is well motivated by the substantial performance gains that can be realized, both in terms of an increase in achievable data rate and a decrease in error rate. The achievable data rate is characterized by the mutual information of the channel. In case of frequency selective multiple input multiple output (MIMO) channels, expressions...
Aiming at the problem of the asynchronous receiving for distributed antenna multiple-input multiple-output system (D-MIMO), a serial detection scheme based on matrix partition is proposed. Firstly, a smaller matrix is partitioned from the equivalent channel matrix and then signal is detected. Secondly, the detected signal in the first step of is used for interference cancellation, and the remainders...
Multiple-input multiple-output (MIMO) systems at the UHF bands is interest for wireless communication applications. When designing and evaluating such systems, knowledge of realistic propagation conditions is required. In this paper, the development of wideband MIMO channel sounder and a pilot measurement result is described for research on the multi antenna radio propagation characteristics considering...
In order to accurately evaluate spatial processing techniques such as MIMO for wideband mobile communications, a Time-Spatial Propagation (TSP) model that can simulate, at the same time, the characteristics of both the delay profile and the spatial arrival angular profile for travelling waves is required. We proposed the TSP model for wideband mobile communication systems using UHF and SHF bands in...
Body Area Networks connect low-power wireless bio-sensors, which are placed in close proximity of the human body. In order to reduce energy consumption, a promising solution is to use the ultra-wideband (UWB) technology in a multiple-sensor multiple-antenna (MS-MIMO) system. This paper deals with a new empirical space-time channel model of the ground reflection.
Large scale parameters (LSP) mainly describe the distribution of the transmitted power over different dimensions of the channel. The required statistic is obtained from MIMO channel measurements with an appropriate post processing procedure. In this contribution, we perform the characterization of large scale parameters within an urban macro cell scenario. We focus on investigating the influence of...
The COST 2100 MIMO channel model is the latest evolution of the geometry-based stochastic channel models developed by the COST actions. This paper provides a full parameterization of the COST 2100 channel model in four indoor scenarios based on channel measurements conducted in two different buildings. In addition to the parameter values, the meaning and extraction method of each parameter are explained.
In this paper, a 4 × 4 indoor multiple-input multiple-output ultra-wideband (MIMO-UWB) measurement campaign in the 2-5 GHz bandwidth is presented. The aim of this work is analyze the effect of radio-wave polarization as well as the effect of frequency dependence on MIMO-UWB systems working in laboratories environment. To achieve this, many parameters such as the mean path loss, the RMS delay spread,...
The stochastic equivalence with the realistic radio propagation environment is a crucial assumption behind geometry-based stochastic channel models (GSCM). Within the 3GPP SCM and WINNER models, the global properties of the underlying stochastic process are expressed by Large-Scale Parameters (LSP), describing the distribution of the transmitted power over different dimensions of the channel. In this...
The development of MIMO over-the-air (OTA) test methodology is an ongoing activity in 3GPP RAN4, CTIA and EU COST Action 2100. In this paper, the focus is on the anechoic chamber approach, which uses a uniform circular array of probe antennas to replicate directional channels for the device-under-test at the array center. In particular, we study in simulation the complexity requirements of implementing...
We demonstrate the transmission of 6 independent, spatially- and polarization multiplexed 28-Gb/s QPSK signals over 10 km of three-mode fiber using mode-selective excitation and full coherent 6 × 6 MIMO processing.
Interference between femto-cell systems is a critical factor for the deployment of such systems in, e.g., residential areas. In this paper we report on a residential channel measurement campaign focusing on the channel properties for femto-cell systems. We characterize basic channel properties such as delay spread and interference levels between different furnished residential houses. In addition...
For automotive applications car to infrastructure wireless communications enable delivering infotainment services such as location based information, voice calls and video streaming. Those services require a reliable high data rate connection which could be provided by cellular LTE which supports channel adaptive MIMO transmission. However, at the automotive side, confined space is available to accommodate...
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