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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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- How to jam your neighbor's Wi-Fi legally
- How is it that these devices are getting FCC approval?Isn't the whole point of FCC approval to avoid this kind of interference?Not yetAll I've heard was that the new standard is still in reveiw, and not accepted yet. I did read that DELL was going to ship units with...
- Tags: fcc approval, fcc, george ou, jp_cnet, off-topic, wi-fi
- Discussion threads 2006-06-19
- Wireless LAN Overview
- Introduction Simple home Wireless LANs Wireless Bridging Medium sized Wireless LANs Large scale enterprise switched Wireless LANsIntroductionWireless LANs based on the IEEE 802.11 standards allow a wire free networking in the local area networking environment using the unlicensed 2.4 or 5.3 GHz unlicensed radio band. They're used everywhere from homes to Fortune 500 companies...
- Tags: access point, figure 2, george ou, lan, mimo, radio, router, wireless, wireless lans, wlan
- Technical articles 2006-04-04
- 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
- 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
- Hermitian Optimization and Scalable VLSI Architecture for Circulant Approximated MIMO Equalizer in CDMA Downlink
- The growing demands for broadband multimedia services, ubiquitous networking via mobile devices push the development of advanced modem technology. Multiple Input Multiple Output MIMO technology using multiple antennas at both the transmitter and receiver has recently emerged as one of the most significant technical breakthroughs in modern communications. On the...
- Tags: multimedia, rice university, optimization, cdma, mimo, vlsi, modems, cellular phones, semiconductors, hardware, components, consumer electronics, personal technology
- White papers 2005-06-06
- An Efficient Circulant MIMO Equalizer for CDMA Downlink: Algorithm and VLSI Architecture
- Wireless communication is experiencing radical advancement to support broadband multimedia services and ubiquitous networking via mobile devices. MIMO Multiple Input Multiple Output technology using multiple antennas at both the transmitter and receiver has emerged as one of the most significant technical breakthroughs for throughput enhancement. This paper presents an efficient...
- Tags: algorithm, rice university, cdma, wireless communication, mimo, vlsi
- White papers 2005-06-05
