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- Generalization of Single-Carrier and Multicarrier Cyclic Prefixed Communication
- This paper describes a cyclic prefixed communication structure that is a generalization of both the Orthogonal Frequency-Division Multiplexing OFDM system and the Cyclic Prefixed Single-Carrier (CP-SC) system. By exploiting the fact that a Circulant Matrix CM is also a Block Circulant Matrix BCM, the proposed Generalized Cyclic Prefixed GCP communication...
- Tags: University Of Southern California, Generalization, Allocation, OFDM, Wireless
- White papers 2005-09-01
- 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
- Minimum-Output-Energy Method for Blind Equalization of OFDM and Systems With Sufficient or Insufficient Cyclic Prefix
- In this paper, a new blind equalization method is proposed for systems with cyclic prefix such as OFDM. With constrained Minimum-Output-Energy MOE optimization, a bank of equalizers can be derived without the help of FFT/IFFT. Algorithms are developed for blindly estimating the constraints and equalizers. When the cyclic prefix is...
- Tags: Method, Property, OFDM, Wireless
- White papers
- Training Sequence Vs. Cyclic Prefix: A New Look on Single Carrier Communication
- This paper introduces a new Training-Aided Single Carrier TASC scheme taking advantage of the Cyclic Prefix nature of a short Training Sequence TS. This allows to perform frequency domain equalization, like for the Single Carrier with Cyclic Prefix (CP-SC) scheme. The modification of the CP in a TS allows to...
- Tags: Training, Workforce Management, Human Resources
- White papers
- Optimizing Voice-Over-IP Speech Quality Using Path Diversity
- In last few years, Voice over Internet Protocol VoIP has been gaining popularity as an alternative to traditional telephone by transmitting voice signals as packets over the Internet and private IP-based networks. However, voice packets experience loss, delay, and delay variation, which require buffering, playout scheduling and loss concealment at...
- Tags: McGill University, IP, Telephony, VOIP, Network Technology, Telecommunications, Networking
- White papers 2006-06-30
- DelayPack (exe)
- DelayPack is a package of 7 delay effects for VST and RTAS. The package includes COSimpleDelay a simple delay with high and lowpass filter, CODuckingDelay a delay with ducking option, COModulationDelay, COPingPongDelay, COSpektralDelay (a 5 band spectral delay), COSpecialDelay (you can set the delaycount and route every delay through a...
- Tags: Delay, CodeOperator, DelayPack
- Software downloads 2006-03-02
- 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
- 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
- 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
- Blind and Semiblind Spatio-Temporal Diversity for OFDM Systems
- Adaptive antenna arrays can be used to improve the performance of Orthogonal Frequency Division Multiplexing systems. They are usually applied in the frequency domain, after the FFT demodulation. In this paper, the selected algorithms are applied in time domain. A blind method is firstly proposed for the maximization of the...
- Tags: Algorithm, Method, Domain, OFDM, Engineering, Wireless
- White papers
- 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
- VersaTimer (zip)
- VersaTimer is a simple, yet very powerful, timer application with some unique features that makes it different from other timers. It can perform 'actions' with cyclic intervals, for example playing a custom sound every minute. Up to three different rules can be set up for each timer, which means three...
- Tags: VersaTimer, Engineering, Telecommunications
- Software downloads 2007-07-02
- Sarbanes Oxley, COBIT and ITIL Compliance: eventACTION and ussACTION Are the Solution for the z/OS Systems Environment
- ITIL and "Best Practices" are no longer sufficient to conform to the Sarbanes Oxley and COBIT requirements. There are many products on the market that claim they can track changes, that they can control/manage changes or that they can audit the use of products and the changes made to the...
- Tags: Sarbanes-Oxley Act, Environment, IBM z/OS, ITIL, Sarbanes-Oxley, Regulatory Compliance, Process Improvement, Change Management, It Services, Regulations, Government, Financial Accounting, Finance, Human Resources, Policies And Procedures, Quality, Business Operations, Tools & Techniques, Management
- White papers 2006-01-23
- Windows XP install error
- I am getting a "data error cyclic redundancy check whenever I try to re-load XP Pro onto a dell inspiron 5150 laptop. It starts when the install screen gets to the gui where there are 39 minutes left. This has happened before but cannot remember the fix..i.e. bad cd or...
- Tags: fatnoldguy@..., Microsoft Windows XP, Microsoft Windows, disc
- Discussion threads 2007-10-25
- 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
- Capacity Scaling of Ad Hoc Networks With Spatial Diversity
- This paper derives the exact outage probability and transmission capacity of ad hoc wireless networks with nodes employing multiple antenna diversity techniques. The analysis enables a direct comparison of the number of simultaneous transmissions achieving a certain data rate under different diversity techniques. Preliminary results derive the outage probability and...
- Tags: Advertisement, University Of Texas, Analysis, Productivity, Wi-Fi, Wireless
- White papers 2007-01-23
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