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- On Cyclic Delay Diversity in OFDM Based Transmission Schemes
- Cyclic Delay Diversity CDD is a simple approach to introduce spatial diversity to an Orthogonal Frequency Division Multiplexing OFDM based transmission scheme that itself has no built-in diversity. It also can be regarded as a Space-Time Code STC. But in contrast to that there is no additional effort in the...
- Tags: Diversity, Cyclic Delay Diversity, OFDM, Wireless
- White papers
- Marine Tank 3D (exe)
- Dive right in and let these fantastically animated salt water fish enchant you. Fifteen types of salt water fish elegantly make their way through the fascinating world of the coral reefs, including Fairy Basslets coming together in a school and a lacy-looking Lionfish. All the while a shy hermit crab...
- Tags: 3D, Screensaver, Diversity
- Software downloads 2007-04-20
- Successful Deployment of Ajax and OpenAjax
- Ajax provides several architectural approaches, and each approach is supported by various commercial software products and/or open source projects. The architectural diversity provides IT managers and Web developers with the ability to choose the optimal architectural approach and best products in order to meet their particular requirements and fit in...
- Tags: Alliance, Diversity, OpenAjax Alliance, AJAX, Internet, Software/Web Development, Web Development, Web 2.0
- White papers 2007-02-07
- A Reduced Complexity Channel Estimation for OFDM Systems With Precoding and Transmit Diversity in Mobile Wireless Channels
- A precoding approach for reduced complexity channel estimation for OFDM systems with transmit diversity is presented. Two different OFDM schemes that employ the precoding are investigated: the first one is based on space-time coding, the second is based on a transmit diversity using an optimal design of symbols for channel...
- Tags: Mobile, Diversity, Channel Estimation, OFDM, Wireless
- White papers 2006-02-07
- Transmit Selection Diversity for Unitary Precoded Multiuser Spatial Multiplexing Systems With Linear Receivers
- Multiuser spatial multiplexing is a downlink transmission technique that uses linear transmit pre-coding to multiplex multiple users and pre-cancel inter-user interference. In such a system the spatial degrees of freedom are used for interference mitigation and generally come at the expense of diversity gain. This paper proposes two pre-coding methods...
- Tags: Diversity, IEEE, Productivity, Wi-Fi, Wireless
- White papers 2005-08-17
- Diversity Analysis for Frequency-Selective MIMO-OFDM Systems With General Spatial and Temporal Correlation Model
- In this paper, the effect of a general spatial and temporal fading correlation structure on the performance of coded MIMO-OFDM systems is studied. The analysis handles an arbitrary joint transmit-receive spatial correlation model including the non-Kronecker model. An upper bound on the maximum achievable diversity order for frequency-selective MIMO-OFDM systems...
- Tags: Diversity, MIMO-OFDM, Analysis
- White papers 2005-08-09
- Improving Performance Through Channel Diversity in the Presence of Bursty Losses
- This paper explores the potential benefits associated with channel or path diversity in improving performance in packet networks. The focus is on schemes that impose no or minimum added complexity, and do not increase the number of packet transmissions. Only long term channel characteristics were assumed known, and the channel...
- Tags: University Of Pennsylvania, Performance, Diversity, Performance Management, Human Resources, Workforce Management
- White papers 2005-06-15
- 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...
- Tags: MIMO, Diversity, IEEE, 3G, Cellular Phones, Wireless, Consumer Electronics, Personal Technology
- White papers 2005-04-29
- Slow Subcarrier-Hopped Space Division Multiple Access OFDM Systems
- Space Division Multiple Access SDMA assisted Multi-Input-Multi-Output MIMO OFDM systems invoking Multi-User Detection MUD techniques have attracted substantial research interests, which are capable of exploiting both transmitter multiplexing gain and receiver diversity gain. Furthermore, the classic Frequency-Hopping FH technique can be effectively amalgamated with SDMA-OFDM systems, resulting in Frequency-Hopped FH...
- Tags: Technique, Microsoft Access, Diversity, OFDM, Productivity, Wireless
- White papers 2005-03-18
- Performance Analysis of Beamforming for MIMO OFDM With BICM
- This paper shows and quantifies both analytically and via simulations that the use of channel knowledge at the transmitter, the technique known as beamforming, achieves the maximum diversity in space when the best eigenmode is used single beamforming. Furthermore, the authors investigate beamforming in conjunction with next generation Wireless Local...
- Tags: Performance, WLAN, Diversity, MIMO-OFDM, University Of California, OFDM, Wireless LANs, LANs, Productivity, Wi-Fi, Wireless, Networking
- White papers 2005-02-04
- Maximum Achievable Diversity for MIMO-OFDM Systems With Arbitrary Spatial Correlation
- In this paper, the maximum achievable diversity order is determined for MIMO-OFDM systems with arbitrary spatial correlation. This paper shows that the maximum achievable diversity order is the rank of the spatial correlation matrix of the channel including all delay paths. The paper also shows that any space-frequency code designed...
- Tags: Diversity, MIMO-OFDM
- White papers 2004-08-23
- Names
- NamesSorry, had to take down this post for personal reasons. Thanks for your commentsNow, this dependsIf it is difficult because it is a traditional name from another culture, then by all means this is a chance to learn something. ( and if you don't like to learn things, then...
- Tags: diversity, off-topic, one-word, TechSupport1
- Discussion threads 2005-12-22
- Learn to harness the full potential of a diverse workforce
- Certain factors, including demographic shifts and affirmative action policies, are driving diversity in the workplace. It's to your advantage as a manager to fully harness the capabilities of a diverse workforce. Here's how.The risks of ignoring the diversity trendsTo find out more about what factors are driving diversity in the...
- Tags: diverse workforce, diversity, Joe Santana, workforce
- Technical articles 2003-08-18
Additional Resources
- Differential Modulation Diversity for OFDM
- The application of Differential Modulation Diversity DMD to orthogonal frequency division multiplexing with multiple transmit and/or receive antennas is considered. Based on diagonal signals originally designed for differential space-time modulation, DMD is used to exploit both space and frequency diversity. At the receiver, low-complexity decision-feedback differential detection without channel state...
- Tags: University Of Toronto, OFDM, Wireless
- White papers
- Cooperative Diversity in Wireless Networks: A Geometry-Inclusive Analysis
- Cooperation between physically separated wireless nodes can achieve the high Signal-to-Noise Ratio SNR diversity gains characteristic of multi-antenna arrays. Simulations indicate that such gains are still achieved for SNRs in the range of practical interest for several applications. Cooperation further yields SNR gains in addition to diversity gains. In contrast...
- Tags: Network, Gain, Wireless Network, SNR, Wi-Fi, Wireless
- White papers 2006-03-10
- Space-Frequency Coded Broadband OFDM Systems
- Space-time coding for fading channels is a communication technique that realizes the diversity benefits of multiple transmit antennas. Previous work in this area has focused on the narrowband flat fading case where spatial diversity only in available. This paper investigates the use of space-coding in OFDM-based broadband systems where both...
- Tags: Stanford University, Broadband, OFDM, Broadband Internet, Network Technology, Telecommunications, Wireless, Networking
- White papers
- On Performance of Multiuser OFDM Systems With Transmit Diversity
- Performance of multiuser orthogonal frequency division multiplexing OFDM systems with transmit diversity over the frequency selective fading channel is explored in this paper. A signal model for the multiuser OFDM system is developed using Alamouti's transmit diversity scheme and the minimum mean square error MMSE method is applied to detect...
- Tags: Performance, OFDM, Wireless
- White papers 2004-11-30
- Realizing the Benefits of User-Level Channel Diversity
- This paper explores the potential benefits of "user-level" channel diversity solutions that instead of dedicating one channel to each user, let all users distribute their packet transmissions across all channels. The paper identifies that the channel configurations for which channel diversity affords meaningful benefits are fortunately also those where it...
- Tags: Channel, University Of Pennsylvania, Benefits, Human Resources
- White papers 2005-09-06
- Multimedia Communication Over OFDM Mobile Wireless Networks: A Cross-Layer Diversity Approach
- Diversity can be used to combat multipath fading and improve the performance of mobile wireless multimedia communication systems. In this work, by considering transmission of an embedded bitstream over a slow varying Rayleigh faded environment, the authors develop a cross-layer diversity technique which takes advantage of both multiple description source...
- Tags: Multimedia, University Of California, OFDM, Productivity, Wireless
- White papers
- Select strong passwords that baffle the bad guys: Apply the principle of character diversity
- Character diversity is a key component of strong passwords. By using many types of characters, we reduce the predictability and weakness of our passwords. In other words, increasing the types of characters we use greatly increases our chances of building unique passwords that are more difficult (i.e. take longer) to...
- Tags: Password, Character Diversity
- Book chapters 2006-10-18
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