Multi-gigabit Wireless Communication Research Articles

Design and Implementation of 60 GHz Wi-Fi for Multi-gigabit Wireless Communications

Design and Implementation of 60 GHz Wi-Fi for Multi-gigabit Wireless Communications

Directional MAC protocol for IEEE 802.11ad based wireless local area networks

IEEE 802.11ad defines a new physical and medium access control layer for IEEE 802.11 networks to operate in the unlicensed 60 GHz millimeter wave spectrum for multi-gigabit wireless communications. Higher frequency waves have higher propagation loss but smaller antenna size. Hence, for millimeter wave networks, higher number of antennas can be packed together, enabling beamforming with very large gains. In this paper, we propose a novel Directional MAC protocol for Basic Stations (DMBS) with the goal of fully leveraging spatial reusability, and limiting deafness and hidden terminal problems with minimal overhead, and without using any complicated hardware for localization. The distinguishing features of DMBS are threefold. First, DMBS extends the association beamforming training time (A-BFT) of IEEE 802.11ad, during which the stations perform initial beamforming training with the access point (AP), by an intelligent listening mechanism. This mechanism allows the stations to passively learn about the best direction of the neighboring stations, decreasing the associated beamforming training overhead. Second, DMBS determines the best transmission direction by using multi-directional sequential (circular) RTS/CTS (Request To Send/ Clear To Send) (CRTS/CCTS) packets, and tracks the best direction by updating its beamforming table upon reception of every RTS/CTS packet, without requiring any additional hardware for localization. If the location information of the destination is up-to-date, the source station only transmits directional RTS/CTS (DRTS/DCTS) in the known direction. Third, DMBS uses two network allocation vectors (NAVs). The first NAV, denoted by NAV1, is used to reduce deafness by determining the busy nodes upon the reception of every RTS/CTS packet. The second NAV, called NAV2, is used to limit hidden terminal problem while maximizing spatial reusability by determining whether a transmission can interfere with active communication links. If NAV2 is set, then the node defers its multi-directional communication but still communicates directionally. We provide a novel Markov chain based analytical model to calculate the aggregate network throughput of DMBS. We demonstrate via extensive simulations that DMBS performs better than existing directional communication protocols in terms of throughput for different network sizes, mobilities and number of receivers.

A switched beam antenna array with butler matrix network using substrate integrated waveguide technology for 60 GHz wireless communications

The 60GHz band has a lot of potential for high speed multi-gigabit wireless communications. In this paper, a switched beam antenna array based on substrate integrated waveguide (SIW) technology is designed and simulated at 60GHz band. The antenna array is fed by 4×4 planar butler matrix network in order to achieve the switched beam characteristic. The use of SIW technology offers a low cost and a planar design. Each of the components is designed and simulated in the electromagnetic simulation tool CST MWS. The components are integrated later to form the switched beam antenna. Then the designed switched beam antenna is fabricated for measurement. The simulated results agree well with the measured values which validates the proposed design. The return losses and isolations are lower than −10dB from 57GHz to 64GHz for all of the input ports. The peak gain for the switched beam antenna array is 17.5dBi at 60GHz.

WiGiG: Multi-gigabit wireless communications in the 60 GHz band

The Wireless Gigabit Alliance [1] - commonly called WiGig - is an industry consortium devoted to the development and promotion of wireless communications in the 60 GHz band. Recent advances in 60 GHz technology and demand for higher-speed wireless connections are key drivers for WiGig. Among the unlicensed frequency bands available for wireless networks, 60 GHz is uniquely suited for carrying extremely high data rates (multiple gigabits per second) over short distances. WiGig has developed a medium access control (MAC) layer, a physical (PHY) layer, and several protocol adaptation layers (PALs) to enable interoperable devices that take advantage of these extremely high data rates. WiGig is also working closely with standards bodies, including IEEE 802.11, and other industry groups, such as the Wi-Fi Alliance, to help enable certification of standards-compliant devices.

Wilocity tapes-out multi-gigabit wireless communication SoC using Synopsys DesignWare IP

Wilocity tapes-out multi-gigabit wireless communication SoC using Synopsys DesignWare IP

Performance Analysis of Future Multigigabit Wireless Communication Systems at THz Frequencies With Highly Directive Antennas in Realistic Indoor Environments

In this paper, a simulation environment encompassing realistic propagation conditions and system parameters is employed in order to analyze the performance of future multigigabit indoor communication systems at tetrahertz frequencies. The influence of high-gain antennas on transmission aspects is investigated. Transmitter position for optimal signal coverage is also analyzed. Furthermore, signal coverage maps and achievable data rates are calculated for generic indoor scenarios with and without furniture for a variety of possible propagation conditions.

An Overview of Multigigabit Wireless through Millimeter Wave Technology: Potentials and Technical Challenges

This paper presents an overview of 60 GHz technology and its potentials to provide next generation multigigabit wireless communications systems. We begin by reviewing the state-of-art of the 60 GHz radio. Then, the current status of worldwide regulatory efforts and standardization activities for 60 GHz band is summarized. As a result of the worldwide unlicensed 60 GHz band allocation, a number of key applications can be identified using millimeter-wave technology. Despite of its huge potentials to achieve multigigabit wireless communications, 60 GHz radio presents a series of technical challenges that needs to be resolved before its full deployment. Specifically, we will focus on the link budget analysis from the 60 GHz radio propagation standpoint and highlight the roles of antennas in establishing a reliable 60 GHz radio.

Indoor freespace optical links for multi-gigabit wireless communications

Indoor freespace optical links for multi-gigabit wireless communications