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In the conventional multi-input multi-output (MIMO) communication systems, only spatially separated uni-polarized antenna elements are mainly considered in a lot of research works, and some researcher consider to use the cross-polarized MIMO system to reduce the channel correlation effect in MIMO channel matrix. By using orthogonal polarized antennas in the MIMO system, the transmitted signal from...
In this paper, a platform for measuring the impulse response of wireless multiple-input-multiple-output (MIMO) vehicle-to-vehicle (V2V) channels is presented. The platform is developed using Rice University Wireless Open-Access Research Platform (WARP) boards and utilized to perform an experimental study of V2V channels through conducting field measurements. A full characterization of MIMO-V2V channels...
In this paper, we present two layered multiuser detectors (MUDs) for MIMO frequency-time-domain (FT-domain) spread multi-carrier (MC) direct sequence code division multiple access (DS-CDMA) systems. We assume the users are organized into groups, and each user is assigned a unique Time-domain (T-domain) signature code. Moreover, the same group''s users share a unique F-domain signature code. However,...
Spatial modulation (SM) is a unique single-stream, multiple-input multiple-output (MIMO) transmission technique. Unlike multi-steam MIMO schemes, a single transmit antenna is activated in SM at any given time. Therefore, inter-channel interference is completely avoided. In addition, SM requires only one radio-frequency (RF) chain, regardless of the number of transmit antennas used. This key property...
We study and analyze coverage region for MIMO amplify-and-forward (AF) relay network. We consider the network geometry in which L relays are placed uniformly around the source, and assume that there is no direct link between source and destination. We analyze desired transmission rate with the purpose of maximizing coverage region. Using Monte Carlo simulations the impact of number of transceiver...
Massive Multiple-Input-Multiple-Output (MIMO) systems deploying a large number of antennas at the base station (BS) have been shown to produce high spectral and energy efficiencies (EE) under the assumptions of increasing BS physical space and critical antenna spacing. We propose a more realistic system model considering a fixed physical space: incorporating coupling and correlation among the BS antennas...
The widely used broadband wireless technology enables a novel application of providing high-quality communications between vehicles and traffic control centers, which is collectively referred to as vehicle-to-ground communications. Channel modeling is in rapidly increasing demand to design and optimize the vehicle-to-ground communication systems. And practical channel models are only available when...
In the multiple input multiple output (MIMO) wiretap channel model which contains path loss, shadow fading and small-scale fading, we consider the effect of both spatial correlation and antenna mutual coupling, with limited size of eavesdropper which has Multi-antenna. Via Monte Carlo simulation, we analyze the effect on secrecy capacity when the location of the transmitter and the eavesdropper changes...
The energy efficiency of a multi-antenna receiver is influenced by the configuration of the antenna array it employs, e.g. with more receive antennas, larger capacity can be obtained while power dissipation is expected to increase. When compact uniform linear arrays are considered, the distance between adjacent antennas becomes a critical parameter due to its close relation to both spatial correlation...
An optimal and a low complexity detectors are proposed in this paper for the detection of temporally and spatially correlated signal in cognitive radio (CR), equipped with multiple antennas both at the primary user (PU) transmitter and secondary user (SU) receiver. Both the detectors require a prior knowledge of temporal and spatial correlation information. The detection performance of the proposed...
LTE UL has been identified as the coverage and capacity bottleneck compared to DL, according to the comprehensive 3GPP studies and field trials. As an effective and promising solution for UL performance enhancements, BS 8-antenna receiver is being more and more widely deployed in LTE commercial networks. To verify the baseband demodulation ability of commercial BS products, a work item has been started...
Since its introduction the fidelity concept has been used to evaluate the time behavior of UWB antennas. However, fidelity has been employed with different meanings. This paper clarifies the differences between fidelity factor, system fidelity factor, and fidelity factor of the system. A recently developed UWB antenna has been taken as a representative one to illustrate the differences among these...
When distributed MIMO antenna systems are deployed in underground tunnels, the optimal separation between antennas depends on achieving a suitable balance between the fading correlation and path loss observed at the receiver. Here, we formulate the task of finding the optimal separation as an optimization problem and propose a genetic algorithm to solve for it.
In this paper, the benefits of using MIMO in body-centric wireless communication channels are evaluated by quantifying the correlation and capacity increase of various on-body channels for both the narrowband and the ultrawideband (UWB) frequency range. The correlation between the sub-channels are evaluated and the achievable channel capacity of a 2×2 MIMO on-body channel is compared to the SIMO and...
A preliminary validation of the Advanced Polarimetric Doppler Weather Radar Simulator (APDWRS) with real data is described in this paper. The APDWRS is used to reproduce an observation of a severe storm event which took place on the 15th of October 2012 over the Tyrrenian coast. One PPI scan performed by the dual polarization C-band Polar 55C weather radar at 17:30 UTC is simulated using APDWRS with...
In this paper, we address the resource allocation (RA) problem for uplink single input multiple output (SIMO) single carrier frequency division multiple access (SC-FDMA). A novel RA algorithm for joint user scheduling and resource block allocation is presented. Particularly, with the aim of improving the spectral efficiency (SE) and reducing the computational complexity, a sub-optimal power projection...
In this paper, we investigate the impact of multiple correlated antennas on the performance of transmit antenna selection with receive maximal ratio combining (TAS/MRC) model. Multiple correlated antennas are considered at the primary and secondary users in dual-hop underlay cognitive radio system. The transmit power condition of our proposed spectrum-sharing system is governed by interference temperature...
Abstract - In order to identify the technology potential of uplink MU-MIMO, Ericsson developed the LTE TDD test bed according to 3GPP Release 8 specification with simplified MMSE receiver and scheduling schemes. The implemented simplified MMSE receiver can significantly reduce the computation complexity with the restriction that the dominant interference should be monitored by the receiver. This paper...
In this paper, we investigate the impact of using outdated channel state information for incremental opportunistic relay selection in a spectrum sharing cognitive network. In our work, we present the outage performance of two schemes where the power allocation is based on the instantaneous outdated channel state information and the statistical knowledge of the interference links, referred to as CSI-based...
A technology exploiting large number of antennas into the wireless transceiver, often called massive MIMO technology, has been received great attention in recent years. The benefits of this approach, however, can be realized only when the quality of estimated channel is ensured at both transmitter and receiver. In this paper, we propose a new channel estimation technique dealing with the pilot shortage...
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