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Spreading Sequences For Uplink And Downlink MC-CDMA Systems: PAPR And MAI Minimization
White Papers This paper deals with spreading sequences selection for downlink and uplink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems with the aim of minimizing the dynamic range of the transmitted multicarrier signal envelope and the multiple...
[January 1, 1970, 0:59]
Spreading Sequences Selection For Uplink And Downlink MC-CDMA Systems
White Papers This paper deals with the selection of the spreading sequences for the downlink and the uplink Multi-Carrier Code Division Multiple Access systems with the aim of minimizing the Multiple Access Interference and the dynamic range of the transmitted...
[January 1, 1970, 0:59]
Impact Of The Spreading Sequences On The Performance Of Forward Link MC-CDMA Systems
White Papers This paper investigates the impact of the spreading sequences on the performance of forward link MCCDMA systems. The paper shows that between the extreme cases of uncorrelated and highly correlated channels, the spreading sequences have a great...
[January 1, 1970, 0:59]
Netsky.D Worm Spreading At 'record Speed'
News A new variant of the Netsky worm was spreading very quickly on Monday. The news comes on a day where firms are already dealing with five new variants of the Bagle worm. Previous Netsky worms scanned the hard drives of infected computers to collect...
[March 1, 2004, 14:00]
Design Of Spreading Sequences For SMPT-Based CDMA Systems
White Papers The aim of this paper is to show the significance of careful design of spreading sequences for the system performance. Three strategies for allocating spreading sequences will be presented and compared.
[January 1, 1970, 0:59]
MSBlast Still Spreading Strongly
News Instead, the worm seems to have been spreading at nearly the same rate over the past few days, according to Internet service provider Akamai Technologies. The worm started spreading on Monday and has infected from 300,000 to a million computers...
[August 18, 2003, 8:40]
Security Alert: W32.Bugbear@mm Spreading Globally
White Papers It's a damaging mass-mailing worm that has been seen worldwide and is rapidly spreading to Windows users. According to security experts, the W32.Bugbear@mm worm is the most severe threat this year, affecting millions of users.
[January 1, 1970, 0:59]
'Bin Laden' Virus Spreading In China
News An email-aware virus named "Bin Laden" is spreading through China, according to the state-run China Daily newspaper. The newspaper attributes the reports to Beijing-based Kingsoft, a developer of antivirus and word processing software.
[November 21, 2001, 17:15]
Rotated Walsh-Hadamard Spreading With Robust Channel Estimation For A Coded MC-CDMA System
White Papers This paper investigates rotated Walsh-Hadamard spreading matrices for a broadband MC-CDMA system with robust channel estimation in the synchronous downlink. The similarities between rotated spreading and signal space diversity are outlined.
[January 1, 1970, 0:59]
Now Spreading Good News Widget
Downloads The Now Spreading Good News Widget is a custom RSS reader dashboard widget for the NSGN.net Online Christian Community. It is a place for christians to gather and enjoy fellowship, study the Bible, and share prayer requests in a clean online setting.
[July 5, 2005, 9:02]
Achievable Information Rates And The Coding-Spreading Tradeoff In Finite-Sized Synchronous CDMA Systems
White Papers This paper computes achievable rates for synchronous Code-Division Multiple-Access (CDMA) systems and studies the associated coding-spreading tradeoff problem using these results. Random spreading sequences are assumed and the computed achievable...
[January 1, 1970, 0:59]
Mainstream Web Sites Spreading Back-door Infections
News There is quite a bit of evidence that what we are seeing is yet another technique for spreading and installing 'spamware'," the group stated on its site. The researchers believe that online organised crime groups are breaking into Web servers...
[June 25, 2004, 8:40]
New Spreading Transforms For Fading Channels
White Papers This paper introduces a new class of symbol-spreading transforms that are well-suited for use in error-control coding systems operating in fading channels. These unitary transforms have the property that they allow for the unambigous determination...
[January 1, 1970, 0:59]
Fiorina Warns Tech Gloom Is Spreading
News This slowdown is now clearly spreading to other parts of the world," Fiorina said, speaking at a news conference a day before the official start of the vast European computer trade show. Fiorina also unveiled a new partnership that will help...
[March 21, 2001, 15:39]
Comparison Of Iterative Detection Schemes For MIMO Systems With Spreading Based On OFDM
White Papers In addition to MC-CDM spreading techniques, the paper introduces a new class of spreading matrices that works both in antenna and frequency direction, referred to as Multi-Carrier Cyclic Antenna Frequency Spreading (MC-CAFS).
[January 1, 1970, 0:59]
Broadband MC DS-CDMA Using Space-Time And Frequency-Domain Spreading
White Papers In this contribution MultiCarrier Direct-Sequence Code-Division Multiple-Access (MC DS-CDMA) using Space-Time Spreading (STS) assisted transmit diversity and Frequency-domain (F-domain) spreading is investigated in the context of broadband...
[January 1, 1970, 0:59]
Spreading Virus Takes Aim At SCO
News Antivirus companies were scrambling on Monday afternoon to learn more about the virus, which started spreading at about noon PST. Mail systems that remove executable files from emails can stop the program from spreading.
[January 27, 2004, 8:30]
Beamspace-Code Transmit Diversity For Two-Dimensional Spreading OFDM-CDM Systems
White Papers This paper presents a transmit diversity scheme that allocates space-time block codes (STBC) to beamspace and spreading codes for two-dimensional spreading orthogonal frequency-division multiplexing code-division multiplexing (OFDM-CDM) downlink...
[January 1, 1970, 0:59]
Subspace-Based Channel Estimation For CDMA Downlink With Aperiodic Spreading Codes And Multiple Subchannels
White Papers This paper considers a downlink CDMA system with aperiodic spreading codes and multipath propagation. The proposed method does not require either the spreading codes of the users or pre-processing of the received data.
[January 1, 1970, 0:59]
Kelvir IM Worm Spreading Fast
News The latest Kelvir worm variant has started spreading over multiple instant-messaging applications. The latest attack has been successful, according to antivirus firm Kaspersky, because of its ability to manipulate PHP links.
[April 15, 2005, 10:35]
