This presentation demonstrates a new predictive capability for simulating massive MIMO antennas and beamforming in dense urban propagation environments. Remcom's unique approach allows us to predict the signal-to-interference-plus-noise ratio (SINR) at specific device locations and the actual physical beams formed using these techniques, including unintentional distortions caused by pilot contamination.
This is a list of published papers and articles that reference our software.
To keep up with rising demand and new technologies, the wireless industry is researching a wide array of solutions for 5G, including Massive MIMO. Remcom’s Wireless InSite provides an efficient method to predict channel characteristics for large-array MIMO antennas in complex multipath environments.
Full wave matching circuit optimization (FW-MCO) is a new technology that combines full wave, 3D electromagnetic (EM) simulation with circuit optimization into a novel approach for solving an age-old RF problem: determining which component values provide the desired match for a given matching network layout. Gone are the days of soldering components in and out of a prototype, trying to achieve the desired performance. This article describes the design process using the design of a matching circuit for a GPS-Bluetooth antenna.
This paper, featured in the July 2015 issue of Microwave Journal, provides a technical comparison of 3D planar EM simulation with fully arbitrary 3D EM simulation and informs users as to which EM approach/formulation may work best for a given application.
XF’s Circuit Element Optimizer utilizes full wave analysis to select the component values for a given printed circuit board (PCB) layout. The tool allows design engineers to optimize matching circuit lumped element values directly in the EM layout where the coupling from multiple antennas and the ground return current paths are taken into account. This whitepaper gives an overview of how the Circuit Element Optimizer works and the benefits it provides.
To meet the increasing accuracy needs of high performance automotive radar design work, the FDTD EM simulation method has emerged as a better solution than traditional FEM formulations. FDTD overcomes FEM limitations that force design engineers to trade away accuracy and to simplify their simulation models. This paper introduces FDTD’s advantages for automotive radar circuit and systems level designers.
This whitepaper demonstrates how XFdtd's time-domain approach enables rapid development by allowing engineers to determine the performance of a fully detailed sensor model installed behind a piece of fascia without needing to build prototypes and run tests in an anechoic chamber. The analysis of a 25 GHz sensor frames the discussion.
Advances in computing resources have made it possible to quickly and accurately model the anti-reflective properties of 3-dimensional sub-wavelength structures. In this paper, the FDTD method was used to model anti-reflective properties of a variety of sub-wavelength structures for 300 to 1300 nm input light.
Finite-Difference Time-Domain Modeling of Ultra-High Frequency Antennas On and Inside the Carbon Fiber Body of a Solar-Powered Electric Vehicle
In this paper, FDTD simulations are performed on a 900 MHz band antenna inside and outside the carbon fiber body of a solar-powered electric vehicle. Data are analyzed to determine the optimal antenna placement for transmission to a receiving antenna located toward the rear of the solar vehicle.
This presentation demonstrates how the 3D ray tracing code in Wireless InSite can accurately predict received power coverage even in a multi-room environment containing many walls and different materials types. In order to verify the accuracy of the code, the floor plan of Remcom’s business offices was modeled in the software with a WiFi antenna and a third party tool was used to create a coverage plot of the received power throughout several of the suites.
This paper outlines the advantages of FDTD EM simulation for analyzing antenna-in-system designs that include both the antenna package and the automobile body features surrounding the device. An XFdtd simulation of a radar mounted in the rear bumper of a sedan provides the framework for the discussion.
With XFdtd EM Simulation Software, there is no limit to the resources you can exploit to solve your EM calculations. This report quantifies the performance profile of XFdtd’s GPU and MPI technologies. We demonstrate the pros and cons of different combinations of equipment and techniques, including cost considerations for those researching available hardware.
This presentation describes the simulation of a hearing instrument (HI) device. The design was simulated in the presence of a homogeneous SAM phantom and an anatomically correct, heterogeneous head model. The simulation results illustrate the differences between the head models and highlight the more acceptable results for improved device safety.
Devices designed for free space operation often fail to meet expectations when deployed in their actual environment. This study considers the example of designing a broadband antenna for an unattended ground sensor using Remcom's XFdtd Release 7 (XF7). To address the challenge of attaining acceptable performance over both dry and wet ground conditions, we use Particle Swarm Optimization (PSO). XStream GPU Acceleration and MPI + GPU technology make this type of sophisticated simulation strategy possible, completing multiple optimizations with hundreds of generations to converge on the best values.
An effective approach is presented for simulation of thin resistive sheets in FDTD. The approach is based on surface impedance and piecewise linear recursive convolution technique. This approach can be combined with a conformal scheme so that it can be applied to deal with an arbitrarily shaped thin sheet. The simulation results for a couple of examples have shown that the approach is robust, stable and quite accurate.
Remcom launched a Culvert (Tunnel) Modeling Tool in Wireless InSite 2.7. To validate the accuracy of the ray-tracing method, Remcom embarked on a verification campaign with the new tool. By comparing the results from Wireless InSite against a statistical model developed by researchers in Colorado, Remcom was able to prove the ray-tracing results are accurate. Remcom presented a series of articles confirming these results and demonstrating the use of the tool for modeling RF propagation in mines.
Uncertainty in structure geometry is a fundamental limitation of ray-tracing methods of simulating urban propagation, exacerbated by performing analysis which pass into buildings of unknown configuration. Empirical models provide an alternative, but do not incorporate the full impact of the neighboring urban structures. Presented is a hybrid approach using ray-tracing methods to arrive within the building and applying empirically derived loss factors to incorporate the effect of unknown interior layouts. This approach is compared with a more typical empirical implementation to demonstrate the benefits of hybridization.
Heterogeneous, mobile wireless networks are becoming increasingly difficult to validate for operational use, depending on digital simulation of the wireless channels to properly predict behaviors in the field. The complexity of these simulation scenarios demands high fidelity modeling of the physical channels at very dense resolution of the trajectories of each moving radio in order to handle rapid changes and multi-path, a high performance computing problem of its own. Presented is an approach to reduce the run-time of these high fidelity simulations by constructing precise results based on adjacent ray-paths from a lower resolution simulation. Speed and accuracy trade-offs are presented for this approach in typical urban scenarios, demonstrating its effectiveness in meeting the growing needs of wireless channel emulation.
A fast approach is proposed for estimating the thermal responses of biological bodies due to RF exposures. The approach is based on ANN models. The results obtained from the fast approach agree well with those calculated directly from the thermal solver. The advantage is that the approach is fast and is not dependent on the biological body and mesh sizes.
Accurately characterizing the propagation of RF signals in tunnels is important for rescue, safety, and military purposes. The material composition of the tunnel, the tunnel shape and size, obstructions, and tunnel bends are challenges facing the computational electromagnetic modeler. In the paper Modeling RF propagation in mines using Wireless InSite, we looked at how the material composition of the tunnel affects the propagation characteristics. In this paper, we extend the analysis of tunnel propagation using Wireless InSite to tunnel diameter and tunnel shape.