WNCG

Analyzing Uplink Massive MIMO Using Stochastic Geometry

Massive multiple-input multiple-out (MIMO) is a promising technique for 5G cellular networks. Prior work showed that high throughput can be achieved with a large number of base station antennas through simple signal processing in massive MIMO networks. The performance of massive MIMO in a large-scale network with irregular base station locations and random user distributions is not yet fully understood.

Dynamic Subarrays for Hybrid Precoding in Wideband mmWave Massive MIMO Systems

Hybrid analog/digital precoding can potentially achieve high spectral efficiencies while requiring less cost and power consumption than fully-digital solutions. This makes it an attractive candidate architecture for millimeter wave systems, which requires deploying large antenna arrays at both the transmitter and receiver to guarantee sufficient received signal power. Most of prior work though on hybrid precoding focuses on narrow-band channels and assumes a fully-connected hybrid architecture. MmWave systems, though, are expected to employ wideband with frequency selectivity.

Forward Collision Vehicular RADAR with IEEE 802.11

The majority of automotive radar deployed in vehicles operates at the millimeter wave (mmWave) band. These devices, however, are susceptible to multiple security risks such as spoofing, which has severe implications for vehicular functions such as forward collision detection and avoidance. The project by Prof. Robert Heath Jr., former UT Research Scientist Dr. Bob Daniels, and student Enoch Yeh introduces a concept for enabling radar functions on traditional IEEE 802.11 devices, creating a joint framework for radar and communications.

Frequency Selective Hybrid Precoding in Millimeter Wave OFDMA Systems

Hybrid precoding, a combination of analog and digital precoding, is an attempt to reach a compromise between complexity and performance. By exploiting more than one radio frequency chain, hybrid precoding enables a millimeter wave (mmWave) system to take advantage of both spatial multiplexing and beamforming gain. A major challenge with hybrid precoding is its configuration in wideband systems because the analog beamforming weights should be the same across the entire band.

Initial Beam Association in Millimeter Wave Cellular Systems: Analysis and Design Insights

Wireless communication via millimeter wave (mmWave) frequencies is a key component of future cellular systems. mmWave deployments will use beamforming with large antenna arrays by both the base stations and mobile stations to ensure sufficient received signal power. Prior work on coverage and rate of mmWave cellular networks focused mainly on the case when base stations and mobile users beamfomring vectors are perfectly designed for maximum beamforming gains.

Millimeter wave wearable networks in crowded indoor environments

Mobile wearable computing devices are rapidly making inroads due to advancements in miniature electronics fabrication technology, mobile wireless communication, efficient batteries, and increasingly capable data analytics. The major driver of the mobile electronics market has been fitness and healthcare gadgets. Recently, a new class of high-end wearable devices has emerged with relaxed power constraints and high data rate requirements.

MmWave channel estimation using sub6-GHz channel information

Due to hardware constraints, millimeter wave (mmWave) channel is not directly accessible and hence estimating mmWave channel for beamforming is difficult. Further, sub-6 GHz and mmWave systems are envisioned to work together, so assuming the knowledge of sub-6 GHz channel is reasonable.  Hence, it is worthwhile to investigate how the channel at sub-6 GHz and mmWave relate. This is particularly important for high mobility scenarios like vehicular communication, where frequent beam-training results in significant overhead.
 

Waveform Design for Joint Millimeter Wave Communication and Radar

Surface transportation safety can be enhanced by the use of wireless technologies, mainly automotive radar and vehicle-to-vehicle (V2V) communication. Automotive radar provides a high-resolution low-latency approach for a continuous automatic detection and ranging of both communication-enabled and non-communication-enabled transportation users. V2V systems rely on the collaborative communication between vehicles to achieve a real-time cooperative detection and ranging.

Analysis of Interference Cancellation in mmWave Cellular Systems

In this research, WNCG visiting graduate student Amir Jafari, WNCG graduate student Jeonghun Park and WNCG professor Robert Heath address the benefits of interference cancellation in millimeter-wave (mmWave) cellular systems. Considering a multiple antenna communications system with transmitting and receiving antennas, the receiving antennas can either be exploited to decode data streams in order to achieve spatial multiplexing, or alternatively the receiving antennas can be used to cancel the interference.

Prof. Andrea Alù Appointed Simons Investigator in Physics

Prof. Andrea Alù was recently appointed as a Simons Investigator in Physics. This program aims to provide a stable base of support for outstanding scientists, and enables them to undertake long-term investigations of fundamental questions in their fields.

Pages

Subscribe to RSS - WNCG