cyclic
RSS cyclicResearch of DFT-OFDM and DWT-OFDM on Different Transmission Scenarios
White Paper To combat ISI, ICI, cyclic prefix is insert between DFT OFDM symbols, and this will take up nearly 25 percent of bandwidth. The DFT based OFDM (DFT-OFDM) has currently drawn most of attention in the area of wireless communication. [03 Jul 2008]
OFDM Versus Single Carrier With Cyclic Prefix: A System-Based Comparison
White Paper This paper shows that for the same data rate, bandwidth and transmit power constraints Single-Carrier with Cyclic Prefix (SC-CP) allows the design of a more power efficient modem than OFDM and is therefore a better candidate for portable wireless... [10 Apr 2008]
An Optimum OFDM Receiver Exploiting Cyclic Prefix for Improved Data Estimation
White Paper A drawback of OFDM systems is the performance/rate reduction due to the cyclic prefix overhead. This paper proposes receiver structures that exploit the cyclic prefix to increase the performance of the link. [10 Apr 2008]
A Dual-Path TEQ Structure for DMT-ADSL Systems
White Paper DMT modulation allows for simplified equalization when the effective duration of the channel memory is shorter that the predefined length of the cyclic prefix (CP). Discrete Multitone (DMT) modulation is the industry standard for Asymmetrical... [10 Apr 2008]
On Cyclic Delay Diversity in OFDM Based Transmission Schemes
White Paper 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. [24 Mar 2008]
The Data Integrity Imperative: If It Isn't Accurate, It Isn't Available
White Paper Vision established the benchmark for data integrity in the high availability industry when, more than five years ago, it incorporated the use of "While active" Cyclic Redundancy Check (CRC) technology into its data synchronization checking... [31 Aug 2007]
Antenna Diversity for OFDM Using Cyclic Delays
White Paper The core idea concerns the introduction of cyclic delays to the effective parts (FFT-parts) of the OFDM signals transmitted/received via several antennas. A new technique is presented for exploiting antenna diversity in OFDM systems, which can be... [06 Aug 2007]
Peter Cochrane's Blog: Wi-fi radiation scare
Comment Fast forward to the modern world and we see a cyclic repetition of this story with the introduction of every new technology: gas and electricity for heat, light and appliances, wireless and television. [29 May 2007]
Shape Analysis for Composite Data Structures
White Paper Examples of such data structures include "Cyclic doubly-linked lists of acyclic singly-linked lists", "Singly-linked lists of cyclic doubly-linked lists with back-pointers to head nodes", etc. This paper proposes a shape analysis that adapts to... [23 May 2007]
Conservative Network Coding
White Paper However, this clean characterization does not extend to cyclic networks. Motivated by practical networking scenarios, this paper introduces a notion of restricted communication called conservative networking. [23 May 2007]
Finite-Alphabet Based Channel Estimation for OFDM and Related Multicarrier Systems
White Paper The resulting algorithms are applicable not only to standard OFDM transmitters with cyclic prefix, but also to the recently proposed zero padded OFDM transmissions that improve symbol recovery at the expense of altering the transmitter and... [19 Apr 2007]
The Cyclic Prefix of OFDM/DMT - An Analysis
White Paper This paper addresses the impact of a too short cyclic prefix on multicarrier systems such as Orthogonal Frequency Division Multiplex (OFDM) and Discrete MultiTone (DMT). A practical implication is, e.g.that the cyclic prefix in some xDSL systems... [18 Apr 2007]
Optimum Pre-DFT Combining With Cyclic Delay Diversity for OFDM Based WLAN Systems
White Paper The cyclic delay diversity is applied in OFDM receiver to increase the frequency-selectivity of the channel seen at the receiver for flat (or less frequency-selective) channels. A new method has been studied to optimize the Pre-DFT diversity... [18 Apr 2007]
Eliminating the OFDM Cyclic Prefix
White Paper The performance and computational intensity of the proposed system is compared to a traditional OFDM system using redundant information from the cyclic prefix. A novel method is presented to estimate the frame time and carrier frequency offset in... [18 Apr 2007]
Per-Tone Equalization for MIMO-OFDM Systems
White Paper This paper focuses on Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems, where the MIMO channel order is larger than the length of the Cyclic Prefix (CP). [18 Apr 2007]
