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Bounds on the Sum Capacity of Synchronous Binary CDMA Channels
White Papers This paper obtains a family of lower bounds for the sum capacity of Code Division Multiple Access (CDMA) channels assuming binary inputs and binary signature codes in the presence of additive i.i.d.noise with an arbitrary distribution.
[April 15, 2009, 1:22]
Point-to-Point Transmission Over MIMO Channels With Intersymbol Interference: Comparison of Single- and Multicarrier Modulation
White Papers In MIMO orthogonal frequency division multiplexing, temporal equalization is performed by applying OFDM, which decomposes the MIMO ISI channel into a set of independent flat fading MIMO channels. For each of this parallel channels (the carriers...
[March 30, 2005, 3:00]
A Low-Complexity Soft Demapper for OFDM Fading Channels With ICI
White Papers This paper examines uncoded and Low-Density Parity-Check (LDPC) coded performance over frequency-selective Doppler fading channels. This paper presents a low-complexity soft demapper that computes bit Log-Likelihood Ratios (LLRs) while suppressing...
[April 13, 2007, 1:01]
IE 4.0 second beta adds Active Channels
News Active Channels will allow data to be supplied directly to users' desktops with offline caching and choice of ways to view content. Microsoft easily beat its self-imposed July 31 deadline by last night making available a second preview of Internet...
[July 16, 1997, 14:51]
Iterative Water-Filling for Optimal Resource Allocation in OFDM Multiple-Access and Broadcast Channels
White Papers A class of optimal resource allocation problems in linear Gaussian Multiple-access and Broadcast channels (MAC and BC) can be summarized as weighted sum power minimization problem. In this paper an iterative water-filling algorithm is proposed to...
[April 13, 2007, 1:01]
Low-Complexity Time-Domain ICI Equalization for OFDM Communications Over Rapidly Varying Channels
White Papers This paper considers wireless OFDM communications over rapidly varying channels as occurring e.g.in high-mobility scenarios. Here, InterCarrier Interference (ICI) is the major source of impairment that limits the transmission quality.
[April 11, 2007, 1:01]
Improving Bandwidth Utilization by Implementing DOCSIS 2.0 Logical Channels
White Papers DOCSIS 2.0 support for logical channels allows cable operators, who deploy standards-based DOCSIS 2.0 Cable Modem Termination System (CMTS) platforms, to provide significant amounts of increased upstream bandwidth.
[May 21, 2008, 1:01]
Covert Channels in Internet Protocols: A Survey
White Papers The creation of covert channels in public computer networks can prove an effective means of information hiding and secret communication. This paper gives a brief overview of covert channels in communication networks, and presents a brief survey of...
[December 6, 2007, 0:01]
IE 4.0 Platform Preview skips 'channels' UI
News Martin Gregory, Internet platforms product manager at Microsoft, said that channels will be implemented in the beta version of IE 4.0 in "a couple of months", allowing users to "tune in" to favourite Web sites and schedule downloads so that new...
[April 8, 1997, 16:48]
A Comparison of Blind Channel Estimation Schemes for OFDM in Fading Channels
White Papers The aim is to study the performance of these schemes in fading channels and thus give a critical comparison of them in the environment where they are most expected to be used. This paper brings together three recently proposed blind detection...
[April 14, 2007, 1:01]
JECho - Interactive High Performance Computing With Java Event Channels
White Papers JECho implements a publish/subscribe communication paradigm, permitting distributed concurrent sets of components to provide interactive service to collaborating end users via event channels. This paper presents JECho, a Java-based communication...
[October 22, 2008, 1:01]
Multilevel Codes for OFDM-Like Modulation Over Underspread Fading Channels
White Papers This paper studies the problem of modulation and coding for doubly dispersive, i.e.time and frequency selective fading channels. Using the recent result that under-spread linear systems are approximately diagonalized by biorthogonal Weyl-Heisenberg...
[April 18, 2007, 1:00]
Multi-Core Intel Architecture Enables Eaton to Quadruple the Data Channels in Its Transmission Testing Systems
White Papers This case study explains how these developers harnessed the performance of new multi-core Intel processors and the multithreaded architecture of National Instruments LabVIEW graphical programming software to quadruple the number of channels...
[March 5, 2008, 0:02]
Intercarrier and Intersymbol Interference Analysis of OFDM Systems on Time-Varying Channels
White Papers In intersymbol interference (ISI) and intercarrier interference (ICI) for OFDM systems with insufficient guard length was analyzed in the case of time-invariant radio channels. This was carried out by truncating the channel impulse response (CIR...
[October 29, 2004, 0:00]
Performance Analysis of Multiantenna WiMAX Systems Over Frequency-Selective Fading Channels
White Papers Focusing on the uplink, the paper proposes an analytical framework to assess the average error probability of the system over time-dispersive (or, equivalently, frequency selective) and space-dispersive (due to the antenna array) Rayleigh fading...
[April 22, 2009, 1:24]
Scale-Lag Diversity Reception in Mobile Wideband Channels
White Papers A wideband signal has a large bandwidth-to center frequency ratio, such that the typical narrowband Doppler spread assumptions do not apply to mobile channels. Such analysis applies, for example, to Ultra-Wideband (UWB) radio frequency channels and...
[August 10, 2007, 11:27]
Maximum-Likelihood Carrier Frequency Offset Estimation for OFDM Systems in Fading Channels
White Papers This effect becomes more sever when compounded by the presence of Doppler fading in wireless channels. Carrier Frequency Offset (CFO) is a major contributor to the inter-carrier - interference in OFDM systems.
[April 13, 2007, 1:01]
Characterizing Achievable Rates in Multi-Hop Wireless Mesh Networks With Orthogonal Channels
White Papers This paper considers the problem of determining the achievable rates in multi-hop wireless mesh networks with orthogonal channels. The authors classify wireless networks with orthogonal channels into two types, half duplex and full duplex, and...
[December 13, 2006, 0:00]
Optimal Broadcast Scheduling for Random-Loss Channels
White Papers Virtually all known results of broadcast scheduling have assumed that channels are reliable without data corruption or loss. This paper studies how to systematically derive optimal broadcast schedules for random-loss channels.
[May 25, 2007, 1:00]
Estimation of Carrier-Frequency Offset and Frequency-Selective Channels in MIMO OFDM Systems Using a Common Training Signal
White Papers This paper presents a common training signal design and corresponding estimation methods for carrier frequency offset and frequency-selective channels in MIMO OFDM systems. In designing the common training signal, a training signal structure which...
[April 13, 2007, 1:01]
