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5G NR Device Manufacturing Challenges: Scaling Millimeter-wave Phased Arrays for Directional Communications
Tuesday, 30 April 2019 - 2:00 PM EST
Millimeter-wave scaled phased arrays support many antenna elements by utilizing multiple integrated circuits (ICs). Module-level integration techniques are leveraged to couple in-package or on-board antennas to the supporting ICs. Such scalable phased arrays are attractive for emerging directional 5G communications since they enable beamforming and beam steering. In addition, a large number of antennas improves link margin; this overcomes the most significant 'path loss' handicap of millimeter-wave communications. Along with its benefits, scaled phased array designs unfortunately come with an increased level of complexity that makes their implementation challenging.
This webinar will examine some of the key challenges with scaling phased arrays such as:
- Signal distribution among multiple ICs
- Increased number of assembly steps
- Stringent area constraints on the ICs to fit within an area compatible with that of the antennas they support
- Increased digital control complexity
In addition to examining these challenges, this webinar will look at two recently introduced scaled 64-element dual-polarized phased array designs as implementation examples:
- A phased-array transceiver module operating at 28GHz supporting 5G applications, and
- TX and RX phased arrays operating at 94GHz, suitable for backhaul and imaging applications.
Design techniques relevant to these applications and measurement results validating the designs will be presented. Finally, an emerging software-defined approach to managing the large number of beam configurations of highly integrated phased-array designs will be discussed.
Webinars Available On Demand
Originally broadcasted on Tuesday, 9 April 2019 - 10:00 AM EST
Creating over-the-air testbeds and prototypes of wireless systems have become increasingly more pervasive in the last decade thanks to advances in Software Defined Radio technology. But hardware alone is not the reason. Open source and commercial software have played a large role in making over-the-air testbeds possible. Whether a researcher wants to take a cellular stack and build on top of it for specific research or use an SDR programmed as an eNB, software like Open Air Interface (OAI) is a crucial piece of the system. This webinar aims to look at how OAI and commercial off the shelf SDRs can be used to create powerful testbeds for advanced wireless communications, from 4G, to 5G and beyond.
Originally broadcasted on Monday, 18 February 2019 - 2:00 PM EST
Massive MIMO requires the simultaneous processing of signals from many antenna chains, and computational operations on large matrices. The complexity of the digital processing has been viewed as a fundamental obstacle to the feasibility of Massive MIMO in the past. Recent advances on system-algorithm-hardware co-design have led to extremely energy-efficient implementations.
This webinar will summarize the fundamental technical contributions to efficient digital signal processing for Massive MIMO. The opportunities and constraints on operating on low-complexity RF and analog hardware chains are clarified. It will explain how terminals can benefit from improved energy efficiency. The status of technology and real-life prototypes will be discussed. Open challenges and directions for future research are suggested.
Originally broadcasted on Tuesday, 13 November 2018 - 1:00 PM EST
Fifth Generation Mobile Networks (5G) not only promise higher data rates and lower latency compared to the current mobile networks, but also focus on connecting billions of devices giving rise to some unique opportunities as well as challenges. Virtualized testing and measurements, and distributed resource utilization will play a key role in its success. Consequently, this webinar will consist of two parts, one focusing on virtualized testing and measurements, and the second focusing on Blockchain as an enabler for distributed resource utilization.
Originally broadcasted on Tuesday, 30 October 2018 - 2:00 PM EDT
Millimeter wave (mmWave) frequencies in combination with small Radio Frequency (RF) coverage look to be key technologies for 5G networks. However, mmWave spectrum comes with high path losses and the solution of small RF coverage to reduce signal congestion suffers from distortions of the transmitted signals. This webinar will look at how measurements of RF front ends designed for mmWave can help address whether commercial-off-the-shelf chip-based RF front end technology is ready to be used for 5G networks.
Originally broadcasted on Monday, 24 September 2018 - 2:00 PM EDT
In less than a decade, Massive MIMO has gone from being a futuristic concept to a key technology in 5G, and an elementary form of Massive MIMO has even made it into LTE networks this year. With the advent of Massive MIMO, we can finally exploit the spatial domain for more efficient communications and multiplexing of users. Massive MIMO is a theoretically very powerful technology, but with great power comes great responsibility for the engineers that implement the system. The signal processing used for channel estimation, multiuser detection in the uplink, and precoding in the downlink must be implemented in the right way, otherwise, we will only achieve a small fraction of the theoretical capacity gains. Simplistic algorithms such as matched filtering and eigenbeamforming have received a disproportionate attention from the research community, probably because they are easy to analyze and implement. Moreover, the seemingly smart zero-forcing algorithm that works well in single-cell scenarios has been commonly applied in multi-cell scenarios, which it is not designed for.
In this webinar, the basics of Massive MIMO will be explained and what characterizes a smart signal processing design. This includes the concept of MMSE processing and how the spatial channel correlation ought to be utilized for interference suppression in practical multi-cell scenarios. The webinar culminates in the definition of Massive MIMO 2.0, which hopefully will be implemented in future releases of 5G.
Originally broadcasted on Friday, 31 August 2018 - 2:00 PM EDT
While millimeter wave (mmWave) frequencies for 5G networks will be a key technology for these new mobile networks, these frequencies present some operational challenges. Directional antennas at the transmitter and the receiver will help address these challenges. However, these directional antennas come with their own set of challenges that both industry and academic research is still at an early phase of addressing. For instance, better models are need to needed to address the different environments that will be encountered, such as urban environments. This webinar will examine the work that is being done in addressing these issues and some of the solutions that have been developed.
Originally broadcasted on Tuesday, 24 July 2018 - 3:00 PM EDT
Radar not only has found widespread application in advanced driver assistance systems (ADAS) but also is one of the key technologies to enable environmental perception in autonomous driving. Unlike the traditional phased-array radar system that transmits via its antenna array a single waveform with different phase shift, multiple-input multiple-output (MIMO) radar can transmit multiple waveforms that may be chosen freely. As compared to traditional radar system with the same number of transmit and receive antennas, MIMO radar achieves significantly improved spatial resolution by exploiting waveform diversity. Due to its advantages, MIMO radar technology has been widely used in designing millimeter-wave radar sensors for ADAS and self-driving cars.
This webinar will look at the fundamentals of MIMO radar as well as novel MIMO radar approaches with the emerging sparse sensing techniques. It will also focus on the role of radar in autonomous driving and various aspects of automotive radar signal processing techniques.
Originally broadcasted on Thursday, 21 June 2018 - 2:00 PM EST
As wireless communications have become ever more important, access to wireless spectrum has become increasingly difficult. The so-called “spectrum crunch” describes a situation in which there is not enough spectrum available to support all of the networks and devices desired. As a result, a critical capability of wireless devices is the ability to share the spectrum they use with other devices, be they communications devices or not. For example, one class of critical spectrum user is the radar system for weather forecasting, navigation, and defense.
This ability to share spectrum with other users has both regulatory and non-regulatory aspects. From a regulatory perspective, there are rules designating how a wireless system needs to behave in order to protect critical operations, or fairly share the spectrum with other users. Beyond regulation, however, there is freedom of operation, and some devices will make better choices in the presence of wireless interference than will others. Network operators need a way to test the performance of devices in the presence of interference, both to understand their ability to support regulatory requirements, and to understand what kinds of choices they are designed to make.
We will provide an overview of the spectrum sharing landscape, including DFS/radar requirements, new regulatory regimes such as CBRS in the US, and industry-driven activities such as the cellular/Wi-Fi co-existence test plan for LTE-U. In addition, we will discuss how devices that operate under these various conditions can be tested to understand their performance.
Originally broadcasted on Wednesday, 20 June 2018 - 2:00 PM EST
The global mobile data traffic is growing at an exponential pace. 5G is supposed to handle 100-1000 times higher throughput than current networks, but this comes at the price of a much higher energy consumption and cost, unless we can make future networks radically more energy efficient. As a first step, we need to make the energy consumption load adaptive, to save power when the data traffic is low. As a second step, we need to design the network architecture with energy efficiency in mind. In this webinar, different strategies for designing energy-efficient 5G networks will be discussed and compared. By taking a holistic approach, we will see how a mix of Massive MIMO and small cells is the most attractive solution. The speaker received the 2018 IEEE Marconi Prize Paper Award in Wireless Communications for his work on this topic.
Originally broadcasted on Thursday, 24 May 2018 - 2:00 PM EST
The cutting edge of 5G research includes the use of millimeter waves, new waveform types, new network topologies, and massive MIMO. If technologies such as millimeter waves or massive MIMO are adopted as part of the official 5G standard, mobile-device testing will become substantially more difficult and expensive. Client devices and base stations will require testing in chambers, where previously testing was done using coaxial connectors. This webinar lays out the cost issues related to handsets, CPEs, IoT devices, and network infrastructure to illustrate how innovative manufacturing solutions can bring down the overall cost of a mobile service.
Originally broadcasted on Thursday, 19 April 2018 - 2:00 PM EST
Ultra-low latency connectivity of less than one millisecond is one of the key IMT 2020 requirements for fifth-generation (5G) cellular systems. In this talk, we will describe the applications that are driving these ultra-fast connections and the technologies in 5G that can achieve them. We provide an end-to-end perspective and consider latency at various layers of the protocol stack, including the physical layer (with a particular focus on millimeter wave communications), rate adaptation and scheduling, core network architecture, and congestion control.
Originally broadcasted on Monday, 16 April 2018 - 12:00 PM EST
Passive high voltage probes, isolated channel oscilloscopes or high-voltage differential probes: They all offer different advantages for measurements on power electronics devices. This talk will give an overview about available solutions and will provide guidelines on how to select the right probe and oscilloscope for you power electronics application.
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