beamforming

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802.11n: MIMO really needs smart antennas

As Wi-Fi standards go, 802.11n has a lot to live up to, especially after hearing how 802.11n's advertised throughput, security, and reliability will allow Wi-Fi to replace existing wired networks. This means 802.11n's RF technology needs to be rock-solid, just like Ethernet cables, while facing ever-changing environmental conditions. ...

Tags: Device, Network, Signal, IEEE 802.11n, Interference, MIMO, Technology, Antenna, RF, Ruckus Wireless, Antenna Diversity, N, Beamforming, BeamFlex, Path Control Module, Ruckus, Wi-Fi, Wireless LANs, Wireless, Michael Kassner

Blog posts 2008-05-14

Beamforming Boosts the Range and Capacity of WiMAX Networks

Having gained tremendous momentum over a number of years, WiMAX is now widely viewed as a leading candidate for Fourth-Generation (4G) wireless data communication. Because WiMAX is based on Internet Protocol IP, the technology builds on principles that have proven versatile and cost-effective in the Internet. Compared to traditional 3G...

Tags: Beamforming, WiMAX, Wi-Fi, Wireless And Mobility

White papers 2008-07-01

Additional Resources

Interpolation Based Transmit Beamforming for MIMO-OFDM With Limited Feedback

Transmit beamforming and receive combining are simple methods for exploiting spatial diversity in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. Optimal beamforming requires channel state information in the form of the beamforming vectors for each OFDM subcarrier. This paper proposes to a limited feedback architecture that combines beamforming vector...

Tags: Vector, Transmitter, IEEE, MIMO-OFDM, OFDM, Wireless

White papers 2005-11-11

Spherical Linear Interpolation for Transmit Beamforming in MIMO-OFDM Systems With Limited Feedback

Transmit beamforming and receive combining can be simply implemented over frequency selective channels by using Multiple-Input Multiple-Output MIMO technology combined with Orthogonal Frequency Division Multiplexing OFDM in what is known as MIMO-OFDM. Generally this requires knowledge of the transmit beamforming vectors for every tone at the transmitter. In systems without...

Tags: Vector, Coherence, Transmitter, University Of Texas, MIMO-OFDM, OFDM, Wireless

White papers 2004-12-29

Transmit Diversity Vs Beamforming for Multi-User OFDM Systems

In an Orthogonal Frequency Division Multiplexing OFDM system, downlink beamforming can be implemented either before IDFT frequency domain or after IDFT time domain module in a base station transmitter. This paper compares Pre-IDFT downlink beamforming with Space-Time Block coded and Space-Frequency block coded transmit diversity schemes for 4×1 downlink multi-user...

Tags: Cell, OFDM, Wireless

White papers 2004-07-02

Comparison of Various Frequency Reuse Patterns for WiMAX Networks With Adaptive Beamforming

This paper evaluates the performance of a WiMAX network in different frequency reuse scenarios with and without adaptive beamforming technique. The authors study the possibility of deploying reuse 1 networks. Radio quality in terms of SINR and outage probability on one hand, and throughput on the other hand, are the...

Tags: Frequency, Performance, Performance Management, WiMAX, Human Resources, Workforce Management, Wireless And Mobility

White papers 2008-02-20

A Novel Wireless Local Positioning System Via a Merger of DS-CDMA and Beamforming: Probability-of-Detection Performance Analysis Under Array Perturbations

This paper investigates the Probability-Of-Detection POD performance of a novel Wireless Local Positioning System WLPS realized via Direct Sequence Code Division Multiple Access (DS-CDMA) and beamforming techniques. The proposed WLPS has unique signaling schemes that discriminate it from the traditional wireless systems and allows the WLPS to have many civilian...

Tags: Merger, Positioning, Wireless, Wireless Local Positioning System, Wi-Fi, Wireless And Mobility

White papers 2005-04-19

Robust Adaptive Beamforming Algorithm Using Instantaneous Direction of Arrival With Enhanced Noise Suppression Capability

This paper proposes a novel adaptive beamforming algorithm with enhanced noise suppression capability. The proposed algorithm incorporates the sound-source presence probability into the adaptive blocking matrix, which is estimated based on the instantaneous direction of arrival of the input signals and voice activity detection. The proposed algorithm guarantees robustness to...

Tags: Algorithm, Engineering

White papers 2006-09-29

RF interference: Just how important are antennas

Once again another Good Article.- You just keep them comming, don't you? Well I, for one, am glad of it. While most of that is still above my head, I just don't have enough time, or the the reason, anymore, I still learn from your articles. It's good that's there's...

Tags: Advertising & Promotion, Adaptive Beamforming

Discussion threads 2008-06-15

802.11n: MIMO really needs smart antennas

Will it be enough?Will the addition of beamforming technology be enough to push 802.11n over the tipping point in the battle against wired network devices?I don't know, but it does sound like continued improvementVery interesting article.As far as I know, there is no type of interference in a wired system...

Tags: MIMO, barrier, barrier activity, multipath interference, conductor, electron, IEEE 802.11n

Discussion threads 2008-05-15

System Level Performance of Cellular WiMAX IEEE 802.16 With SDMA-Enhanced Medium Access

Recent years have witnessed an ever-increasing interest in smart antenna technologies to boost the capacity of existing and future wireless systems. As one of the first standards the wireless metropolitan area network IEEE 802.16 WiMAX provides means to support these techniques. This paper investigates the potential of smart antenna beamforming...

Tags: Microsoft Access, Performance, Aachen University, IEEE 802.16, Wireless, WiMAX, Wireless And Mobility, Wi-Fi

White papers 2007-01-05

Adaptive Antenna Array for IEEE802.16e Base Station in the Presence of Multipath and Interference and Considering Mutual Coupling Effects

In this paper, an adaptive antenna array beamformer for the Base Station of Mobile WiMAX (IEEE802.16e) is designed. This antenna is considered for uplink beamforming in presence of interferer signals and noisy multipath channel. Complex excitation coefficients of the array elements are controlled adaptively to track the mobile user signal...

Tags: Mobile, Antenna, Element Pattern, WiMAX, Advertising & Promotion, Wi-Fi, Wireless And Mobility, Marketing

White papers 2008-04-08

Microphone Array for Headset With Spatial Noise Suppressor

This paper presents a hybrid microphone array architecture used for processing the signals from a small microphone array that is used in a headset. The processing chain consists of fixed end-fire beamforming, adaptive spatial noise reduction and stationary noise suppression. The far-field design algorithm used for the fixed beamformer is...

Tags: Noise Reduction, Microphone, Headset

White papers 2005-06-30

The Hidden Cost of Overhead in MIMO Wireless LANs

Multiple Input Multiple Output MIMO communication, enabled by the presence of multiple transmit and receive antennas in the communication link, is a physical layer technology that can improve throughput in WLANs. The cost of MIMO in terms of additional overhead, unfortunately, is often overlooked. Using representative physical and MAC models,...

Tags: Physical Layer, Throughput, Overhead, MIMO, Workforce Management, Human Resources

White papers 2007-05-07

A Practical Guide to WiMAX Antennas: MIMO and Beamforming Technical Overview

Wireless operators are increasingly pressured to enhance their networks and service capabilities in order to keep pace with the accelerating growth in wireless utilization and increasing demand for high performing connections. As bandwidth intensive, rich media applications are introduced, larger volumes of subscribers consume ever-growing quantities of data packets while...

Tags: WiMAX, Mobility, MIMO, Rich Media, Motorola Inc., Wireless Operator, Wi-Fi, Wireless

White papers 2007-04-13

The Business of WiMAX: Impact of Technology, Architecture & Spectrum on the WiMAX Business Case

The advent of next generation, wireless broadband platforms pairing performance with favorable economics is ushering in a new age of unprecedented connectivity in communities across a diverse range of global markets. Mobile WiMAX, based on the IEEE 802.16e-2005 global standard, leads the evolution roadmap with market ready solutions leveraging the...

Tags: Business Case, Broadband, Spectrum, Wireless, WiMAX, Wi-Fi, Wireless And Mobility, Broadband Internet, Network Technology, Telecommunications, Networking

White papers 2008-11-11

A MAC Protocol Based on Adaptive Beamforming for Ad Hoc Networks

This paper presents a novel slotted MAC Medium Access Control protocol for nodes equipped with adaptive antenna array in ad hoc network. The protocol relies on the ability of antenna to uses DOA (Direction-Of-Arrival) information to beamform by placing nulls in the direction of interferers thus maximize SINR (Signal to...

Tags: Advertisement, MAC, Protocol

White papers 2009-01-01

Finding the Best Fit - Wi-Fi Versus WiMAX

Wi-Fi and WiMAX are two different technologies that often compete in fixed and nomadic deployments. This paper discusses which technology provides the best fit for different applications. The discussion reviews aspects such as the affect of frequency licensing on the technology in terms of interference, bandwidth and power. The cost...

Tags: WAVION, Wireless LANs, Wi-Fi, Wireless And Mobility, WiMAX

White papers 2009-02-01