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- WLAN MIMO Operation and Measurement
- WiFi WLAN radios are getting smarter and faster, with the objective of reaching user throughputs in excess of 100Mbps. One of the techniques being used to achieve this is to apply Multi-In Multi-Out radio MIMO. This means transmitting and receiving parallel signals simultaneously. Using a minimum of math, this webcast...
- Tags: WLAN, MIMO, Agilent Technologies Inc., Wireless LANs, LANs, Wireless, Networking
- Webcasts
- Comparison of Iterative Detection Schemes for MIMO Systems With Spreading Based on OFDM
- This paper considers a coded transmission over a time-invariant MIMO channel, where channel state information is present at the receiver but not at the transmitter. As basic modulation technique OFDM is applied. In addition to MC-CDM spreading techniques, the paper introduces a new class of spreading matrices that works both...
- Tags: Technique, MIMO, OFDM, Productivity, Wireless
- White papers
- Principles of MIMO-OFDM Wireless Systems
- The use of multiple antennas at both ends of a wireless link MIMO technology holds the potential to drastically improve the spectral efficiency and link reliability in future wireless communications systems. A particularly promising candidate for next-generation fixed and mobile wireless systems is the combination of MIMO technology with Orthogonal...
- Tags: ETH Zurich, MIMO, MIMO-OFDM, Wi-Fi, Wireless
- White papers
- MIPS Cost Estimation for OFDM-VBLAST Systems
- The focus of this paper is to investigate the feasibility of using programmable DSP processors for MIMO based radio systems. Several detection algorithms were evaluated and MIPS costs for low complexity detection and channel estimation algorithms for OFDM-VBLAST MIMO systems where calculated. Based on the MIPS cost estimation a feasible...
- Tags: Estimation, Radio, MIMO, Feasibility, Advertising & Promotion, Engineering, Marketing
- White papers
- 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
- iMAT: MIMO without multiple antennas
- Antenna systems are not normally a preeminent topic when it comes to discussions about wireless equipment. That attitude is completely understandable; antennas are just not that interesting to most people. To some, including myself, RF propagation and antenna technology are very worthy discussion topics. My fascination started 40 years ago...
- Tags: Situation, MIMO, Antenna, iMAT, Antenna System, RF, EM, EM Isolation, SkyCross, iMAT Antenna System, Michael Kassner
- Blog posts 2008-02-25
- Metamaterial: the unnatural composite is transforming wireless technology
- I get excited when I read about how scientists are able to create experimental conditions that do not occur normally in nature. Recently I was digesting an article on the PhysicsWorld website about how physicists have developed a method using a new class of materials called metamaterial to bring light...
- Tags: Propagation, Wireless Technology, MIMO, Technology, EM, RF, Wi-Fi, Wireless, Michael Kassner
- Blog posts 2008-02-12
- 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, Motorola Inc., Wireless Operator, Wi-Fi, Wireless
- White papers 2007-04-13
- 802.11n, MIMO, and multipath environments
- Tenants are renters"That describes in a nutshell the basic tenants behind MIMO antenna systems."It should be "one of the basic tenets" Tenants are people who rent houses.Otherwise, nice informative article.RE: 802.11n, MIMO, and multipath environmentsWow. As an old-timey short wave radio enthusiast, I have rebuilt and improved not a...
- Tags: Round One from VA, MIMO, tenant, multipath environment, IEEE 802.11n
- Discussion threads 2007-11-15
- 802.11n, MIMO, and multipath environments
- In two previous posts-Multipath environments and how they affect Wi-Fi propagation and How to make the best of 802.11 multipath environments-I examined the somewhat nebulous topic of multipath fading and technologies that minimize the negative effects on Wi-Fi networks. Now I'm going to pull a 180 and talk about how...
- Tags: Environment, IEEE 802.11n, MIMO, Multipath, SISO, Michael Kassner
- Blog posts 2007-11-12
- Belkin mimo g+ 54mbps wireless problems
- Hi there, Im havin an issue with my new belkin wireless router and was wondering if someone could please help.I bough the router last week and when I had installed it i realized that there were viruses on one of the machines on the network.I took that machine off the...
- Tags: Routers & switches, Network technology, Modems, NETWORKING, aidanspoopyhead@..., Belkin Corp., MIMO, router, wireless
- Discussion threads 2007-09-01
- 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: Throughput, Overhead, MAC, MIMO, Workforce Management, Human Resources
- White papers 2007-05-07
- What Wireless Network Adapter Do I Get??
- I am a complete n00b to wireless networking. Which is scary because I now manage one! (Don't tell anyone at the office my secret!) Anyways, I need to buy a new wireless network adapter for my bosses laptop and I am a bit confused. Whats the difference in the letters...
- Tags: Wireless LANs, Wi-Fi, jozhall@..., wireless, MIMO, transmitter, adapter, receiver, IEEE 802.11, network, wireless network, network adapter
- Discussion threads 2007-05-07
- Linear Precoding for Multiuser MIMO-OFDM Systems
- This paper develops linear precoding schemes for the downlink in multiuser Multiple-Input Multiple-Output MIMO Orthogonal Frequency Division Multiplexing OFDM systems with multiple data streams per user. The authors extend an existing multiuser MIMO algorithm, that jointly optimizes the power allocation and the transmit and receive filters, to MIMOOFDM systems. One...
- Tags: MIMO, Allocation, MIMO-OFDM, University Of Toronto, OFDM, Wireless
- White papers 2006-09-28
- Rapid MIMO-OFDM Software Defined Radio System Prototyping
- Multiple Input-Multiple Output MIMO is an attractive technology for future wireless systems. MIMO communication, enabled by the use of multiple transmit and multiple receive antennas, is known for its high spectral efficiency as well as its robustness against fading and interference. Combining MIMO with Orthogonal Frequency Division Multiplexing OFDM, it...
- Tags: Radio, MIMO, MIMO-OFDM, OFDM, Wireless
- White papers 2006-06-20
- Antenna Design and Site Planning Considerations for MIMO
- The capacity and reliability of Multiple-Input Multiple-Output MIMO wireless communications systems may be sensitive to the design of the antenna arrays employed at the transmitter and receiver, as well as to the nature of the propagation between the arrays. This paper discusses the emerging methodology of array design for indoor...
- Tags: MIMO, Wi-Fi, Wireless
- White papers 2006-01-05
- Performance Analysis of MIMO NLOS OFDM Broadband Fixed Wireless Access Systems
- The combination of Multiple Input Multiple Output MIMO techniques and Orthogonal Frequency Division Multiplexing OFDM modulation, two powerful technologies in the physical layer design, represents a promising means to provide high-data-rate and high-quality wireless access in presence of Non Line Of Sight NLOS propagation. This paper focuses on performance evaluation...
- Tags: Performance, MIMO, Wireless Access, Wi-Fi, Wireless
- White papers 2005-12-14
- 10 things you should know before you buy an 802.11n wireless device
- This article is also available as a TechRepublic download.If you've spent any time in your local tech shop, you aresure to have seen a rash of Pre-N and Draft-N wireless products. Before you getcaught up in a rush of new product frenzy and plunk your money down, take a fewminutes...
- Tags: 802.11/Wi-Fi, Draft-N, IEEE, IEEE 802.11n, Joshua Hoskins, MIMO, Mobile/wireless, Pre-N, wireless, wireless device
- Technical articles 2006-12-04
- Multimode Precoding for MIMO Wireless Systems
- Multiple-Input Multiple-Output MIMO wireless systems obtain large diversity and capacity gains by employing multielement antenna arrays at both the transmitter and receiver. The theoretical performance benefits of MIMO systems, however, are irrelevant unless low error rate, spectrally efficient signaling techniques are found. This paper proposes a new method for designing...
- Tags: Transmitter, MIMO, Idea
- White papers 2005-10-01
- A High-Speed Four-Transmitter Four-Receiver MIMO OFDM Testbed: Experimental Results and Analyses
- By adopting Multiple-Input Multiple-Output MIMO and Orthogonal Frequency-Division Multiplexing OFDM technologies, indoor wireless systems could reach data rates up to several hundreds of Mbits/s and achieve spectral efficiencies of several tens of bits/Hz/s, which are unattainable for conventional single-input single-output systems. The enhancements of data rate and spectral efficiency come...
- Tags: MIMO, OFDM, Wireless
- White papers 2005-09-01
