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- Performance of Antenna Selection for MIMO-OFDM Systems Based on Measured Indoor Correlated Frequency Selective Channels
- This paper presents and compares antenna selection strategies for frequency selective MIMO-OFDM channels. Real channels are measured, and used to evaluate performance. Results for simulated TGn channel models are also presented. The paper shows that the capacity gain predicted from the simulated channels, is significantly lower than can be achieved...
- White papers 2006-08-14
Additional Resources
- 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. ...
- 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...
- Blog posts 2008-02-25
- 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...
- Blog posts 2007-11-12
- Novel Tap-Wise LMMSE Channel Estimation for MIMO W-CDMA
- In this paper, a tap-wise LMMSE channel estimator for MIMO W-CDMA is derived. Descrambling operations applied to delayed versions of the received signal whiten the input signal. The descrambling process thus breaks up the full channel autocorrelation matrix including spatial and temporal correlation into several independent, small autocorrelation matrices that...
- White papers 2008-12-09
- MIMO Channel Sounder at 3.5 GHz: Application to WiMAX System
- The use of antenna arrays at emission and reception seems to represent a prominent solution for future wireless systems, it improves data rates and enhances the quality of service. The performance of these systems depends mainly on the propagation channel. Therefore, channel's characterization and modeling are crucial. This paper presents...
- White papers 2008-10-01
- An Analysis of MIMO Techniques for Mobile WiMAX Systems
- Multiple Input Multiple Output MIMO techniques are an essential part of the IEEE 802.16e - 2005 specifications, which form the basis of mobile WiMAX systems. This paper discusses the basic tradeoffs between diversity, interference cancellation and spatial multiplexing in MIMO systems, and the authors compare Optimum Combining OC, Maximum-Ratio combining...
- White papers 2008-03-11
- Diversity, Interference Cancellation and Spatial Multiplexing in MIMO Mobile WiMAX Systems
- Multiple Input Multiple Output MIMO techniques are an essential part of the IEEE 802.16e - 2005 specifications, which form the basis of mobile WiMAX systems. This paper first discusses the tradeoffs between diversity, interference cancellation and spatial multiplexing in MIMO systems, and it compare Optimum Combining OC, Maximum-Ratio Combining MRC...
- White papers 2007-01-19
- Efficient MIMO Equalization for Downlink Multi-Code CDMA: Complexity Optimization and Comparative Study
- This paper presents an efficient LMMSE chip equalizer to suppress the interference caused by the multipath fading channel in the MIMO Multi-Code CDMA downlink. The block-Toeplitz structure in the correlation matrix is approximated with a block circulant matrix. An FFT-based algorithm is applied to avoid the Direct-Matrix-Inverse DMI in the...
- White papers 2004-08-27
- A Link Adaptation Algorithm in MIMO-Based WiMAX Systems
- In order to extend the coverage of wireless communication to metropolitan scale, the Worldwide Interoperability for Microwave Access WiMAX standard was developed and ratified as the IEEE 802.16d standard in June 2004. The standard defines an adaptive modulation framework which allows a WiMAX system to communicate with various burst profiles...
- White papers 2007-08-01
- Multiple-Antenna Technology in WiMAX Systems
- WiMAX is a wireless technology that provides broadband data at rates over 3 bits/second/Hz. In order to increase the range and reliability of WiMAX systems, the IEEE 802.16-2004 standard supports optional multiple-antenna techniques such as Alamouti Space-Time Coding STC, Adaptive Antenna Systems AAS and Multiple-Input Multiple-Output MIMO systems. This paper...
- White papers 2004-08-20
- MIMO in 3G Cellular Systems: Challenges and Future Directions
- The multidimensional MIMO channel can be exploited to increase the diversity of the system or to provide parallel spatial channels, which is known as spatial multiplexing. Diversity is generally considered lower risk, and a well-known example is space-time codes, which have found adoption in 3G CDMA cellular systems. Diversity increases...
- White papers 2005-04-29
- MIMO Techniques for Mobile WiMAX Systems
- The WiMAX standard includes many different features and options to make the best use of the wireless channel characteristics. These include adaptive modulation and coding, and multiple antenna techniques such as transmit/receive diversity and spatial multiplexing. This paper discusses the main benefits and design challenges of these techniques. It turns...
- White papers 2006-10-05
- 802.11n - The consequences of abandoning the 5 GHz frontier
- When 802.11b first started getting popular in late 2000, no one imagined that it would still be the most dominant standard 6 years later and continue to dictate the design of the latest wireless LAN products because it is the lowest common denominator. As with any technology that is...
- Blog posts 2007-01-24
- 802.11n draft 1.10 - A kinder gentler neighbor
- In summer of last year I wrote a cynical blog about "How to jam your neighbors Wi-Fi legally". I was referring to the fact that "Draft N" products were achieving their high throughput at the expense of annihilating their neighbors 802.11 b/g Wi-Fi access. As soon as the...
- Blog posts 2007-01-23
- Wireless LAN spectrum management
- Contents Introduction to 802.11 radio spectrum 2.4 GHz spectrum management 5.3/5.8 GHz spectrum managementIntroduction to 802.11 radio spectrumIn North America including the USA and Canada, two unlicensed radio bands(technically 3 if you count 5.3 and 5.8 as 2 separate bands) are used for IEEE802.11 wireless LAN transmissions. The 2.4 GHz band is very...
- Technical articles 2006-04-17
- 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...
- Discussion threads 2007-05-07
- Interesting Wireless Issue
- I have two computers using wireless at home, one being a desktop and the other a laptop. The desktop has never had a wireless problem but the laptop drops the connection "randomly"--anywhere from 1 to 10+ times a day. In the router's log it says this at every...
- Discussion threads 2008-04-27
- Portable power beyond compare sums up the Alienware m9700 SLI notebook
- Whenmost of us think of a computer notebook we think of a small, portable devicethat is useful for e-mail and some basic productivity functions and fortransporting that all-important PowerPoint presentation to the next meeting.Sure you can play some solitaire in the airport, but that's about the extent ofyour typical notebook's...
- Technical articles 2006-08-30
- Belkin N Wireless Failing with Virgin Media Cable Service
- HiI have Virgn Media cable 20mb broadband with an Apple Powerbook 10.4 MAC OS. I upgraded to a wireless router from Belkin, the N MIMO F5D8233UK4 at the weekend.Direct ethernet connection to the router works but the Wireless internet connection doesnt work.I followed the instructions and created my wireless network...
- Discussion threads 2008-02-25
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