A5038775202- Antenna Design and Analysis
- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Techniques
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- Wireless Communication Networks Research
- Millimeter-Wave Propagation and Modeling
- Radio Frequency Integrated Circuit Design
- Cooperative Communication and Network Coding
- Full-Duplex Wireless Communications
- Satellite Communication Systems
- Modular Robots and Swarm Intelligence
- Model-Driven Software Engineering Techniques
- VLSI and FPGA Design Techniques
- Radio Astronomy Observations and Technology
- Error Correcting Code Techniques
- Embedded Systems Design Techniques
- Microwave Imaging and Scattering Analysis
- Advanced Power Amplifier Design
- Superconducting Materials and Applications
- Wireless Body Area Networks
- Bluetooth and Wireless Communication Technologies
- Particle accelerators and beam dynamics
Broadcom (United States)
2011-2018
CHDI Foundation
2018
Broadcom (Israel)
2010-2014
University of California, Irvine
2004-2011
Universitat Politècnica de Catalunya
2010
Multi-input multi-output systems with associated technologies such as smart antennas and adaptive coding modulation techniques enhance channel capacity, diversity, robustness of wireless communications has been proven by many recent research results both in theory experiments. This article focuses on the antenna aspect MIMO systems. In particular, we emphasize important role reconfigurable its links space-time that can be employed for further exploitation theoretical performance The...
The IEEE 802.11ad standard supports PHY rates up to 6.7 Gbps on four 2 GHz-wide channels from 57 64 GHz. A 60 GHz system offers higher throughput than existing 802.11ac solutions but has several challenges for high-volume production including: integration in the host platform, automated test, and high link loss due blockage polarization mismatch. This paper presents a radio chipset capable of SC OFDM modulation using 16TX-16RX beamforming RF front-end, complete with an antenna array that...
A 144-element phased array transceiver is realized using a modular tiled approach that supports 802.11ad, MCS12 single carrier 16-quadratic-amplitude modulation (QAM) 4.6 Gbps, in the 60-GHz band. It consists of system-on-a chip (SOC) (MAC/PHY/BB to IF) 28-nm CMOS, and one IF-to-60-GHz master driving twelve slave chips fabricated 40-nm CMOS. Using master-slave configuration, with 12 phase-controlled TX/RX slices expanded 144 slices. Each final slice then connected two patch antennas on LTCC...
The design and characterization is described of a compact dual-linearly-polarized reconfigurable 2-port antenna. antenna can operate in two different selectable linear polarization bases, thus being capable reconfiguring/rotating its base from vertical/horizontal (0°/90°), to slant ±45°. has been implemented on quartz substrate, uses monolithically integrated micro-electromechanical (MEM) switches select between the aforementioned bases. operates at 3.8 GHz presents fractional bandwidth...
A multifunctional reconfigurable pixeled antenna that uses microelectromechanical switches (MEMS) and operates within the 4-7 GHz frequency band is presented. The proposed a highly planar surface radiator composed of an n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">px</sub> × matrix metallic pixels interconnected through MEMS switches. can be reconfigured to perform multiple functions such as: tuning, pattern diversity, polarization...
We present a theoretical analysis on the gains offered by reconfigurable multiple-input multiple-output (MIMO) system using orthogonal space-time block codes (OSTBCs) and antennas at receiver only. The proposed selects optimal radiation state of receive in which signal-to-noise ratio (SNR) is maximized. findings show that under certain channel propagation conditions an appropriate codification power allocation transmitted signal, diversity order MIMO given product transmit as well number...
The IEEE 802.11ad standard supports PHY rates up to 6.7Gb/s on four 2GHz-wide channels from 57 64GHz. A 60GHz system offers higher throughput than existing 802.11ac solutions but has several challenges for high-volume production including: integration in the host platform, automated test, and high link loss due blockage polarization mismatch. This paper presents a full-featured chipset capable of SC OFDM modulation using 16TX-16RX beamforming RF front-end, complete with an antenna array that...
The 802.11ad standard (WiGig) provides throughput speeds of multi-Gb/s covering tens meters and uses beamforming in the four 2GHz-wide channels 60gHz ISM band. Conventional backhaul solutions, on other hand, are designed with high gain directional antennas no electronic beam steering have cost for installation alignment antennas. This paper presents a full-featured chipset 144-element phased array using tiled approach CMOS IPs developed WiGig to address low-cost municipal WiFi, small-cell...
This paper presents the theory, design procedure, and implementation of a dual-band planar quadrature hybrid with enhanced bandwidth. The topology circuit is three-branch-line (3-BL) hybrid, which provides much larger flexibility to allocate desired operating frequencies necessary bandwidths than other previously published configurations. A performance comparison topologies presented. Finally, 3-BL for dual band (2.4 5 GHz) wireless local area network systems was fabricated, aimed cover...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">An optimized linear multielement antenna (MEA) is presented for selection combining schemes that improves the diversity gain and capacity in medium low multipath environments, with respect to performance achieved a simple uniform array (ULA) using omnidirectional antennas, while it performs equally as well ULA highly scattered environments. An analytical investigation based on analysis of...
Reconfigurable antennas offer a promising solution to the problem of space limitation in high-performance wireless communication over handset devices. In this paper, we propose novel transmission scheme capable extracting maximum diversity gains Multiple-Input Multiple-Output (MIMO) system employing reconfigurable at transmitter, receiver or both ends link, without need for feedback. For MIMO using state-switching combination with an appropriate three-dimensional block code order extract...
This paper shows the design of a dual-band Butler matrix aimed to cover bands corresponding standards IEEE802.11a/b, with particular interest in WLAN systems, at 2.4 GHz and 5 bands. Measurements individual components which compose are presented. Those are: quadrature hybrid 0 dB coupler. The phase shifter is also described. A final proposed measured. Over frequency range, exhibits errors couplings within 13.5/spl deg/ - 6.7 /spl plusmn/ 0.8 dB, respectively. performance prediction connected...
In this paper we propose a highly multifunctional pixel antenna for WiMax applications, that uses micro electromechanical switches (MEMS) to reconfigure its radiation modes and operating frequency. These capabilities can be used improve the performance of current narrowband communication systems. This work was supported in part by National Science Foundation award ECS-0424454.
This paper addresses the functional reliability and complexity of reconfigurable antennas using graph models. The correlation between for any given antenna is defined. Two methods are proposed to reduce failures improve antennas. caused by reconfiguration technique or surrounding environment. These failure reduction tested examples which verify these methods.
Advanced communication scenarios demand the development of new systemswhere antenna theory, channel propagation and models are seen from a common perspective as way to understand o
In this paper we propose a software defined highly multifunctional pixeled antenna for narrowband multiple-input multiple-output (MIMO) wireless communication systems, that uses micro electromechanical switches (MEMS) to reconfigure its radiation modes and operating frequency. These capabilities can be used improve the performance of current systems also fit some requirements needed by radio architectures. The characteristics return loss response present structure are presented.
This paper presents a new reconfigurable radiating structure that exploits polarization diversity from single-element antenna. Simulations on the gain have been carried out for indoor and outdoor cells. The results show proposed combining scheme, although simple, can in fact provide considerable improvements selection when used together with compact octagonal isolated orthogonal element (ORIOL)
In this work the capacity and feasibility of a new concept reconfigurable-parasitics printed-dipole antenna system able to approach these demands on dynamic way is analyzed some preliminary results are presented. The technique proposes an on-the-antenna-switch (OASC) that improves compactness efficiency existing systems. particular, partially pixeled proposed particle swarm optimizer (PSO) used calculate state every OASC optimize dimensions structure. Dynamically reconfigurable systems,...
This paper presents a multidisciplinary study on new transmission signaling technique that uses polarization-reconfigurable antennas to improve the performance of well known Alamouti space-time code. The code is normally used in transmitting diversity schemes with two antennas, but it can also be distinct orthogonal polarizations, as shown this paper.
In this paper, we present an open-loop reconfigurable multiple-input multiple-output system, employing ORIOL antennas at both ends of the communication system. The is a compact dual-polarized antenna introduced in [1]. First, provide realistic model for our system based on measurements conducted using antennas. Then, analytically discuss performance limits practical and derive maximum achievable diversity gains. Furthermore, design specific space-time block code that capable achieving such...
One of the main problems in wireless communications systems is lack signal coverage some specific areas shadowed by obstacles. The use repeaters becomes a cost-effective solution to extend low strength. To avoid frequency conversions, an iso-frequency repeater (gap-filler) can be used. This device acts as directional amplifier that receives from donor base station and retransmits it with same after amplification stage. A block diagram general shown Fig. 1. On other hand, compact gap-filler...
The paper presents an investigation of the adaptive parameters multi-antenna schemes for use in future reconfigurable MIMO systems. study puts a special emphasis on linking concept channel diversity, either spatial or polarization domain, with type being used, both at transmitter (TX) and receiver (RX), level multipath provided by vertical horizontal direction, respect to propagation plane. It has been found that NLOS indoor channels are very sensitive signal diversity employed component used.