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Reduced Complexity Joint Iterative Equalization And Multiuser Detection In Dispersive DS-CDMA Channels
White Papers Communications in dispersive direct-sequence code-division multiple-access channels suffer from intersymbol and multiple-access interference, which can significantly impair performance. Joint maximum a posteriori probability equalization and...
[June 16, 2006, 0:00]
Time-Domain And Frequency-Domain Per-Tone Equalization For OFDM Over Doubly Selective Channels
White Papers This paper proposes new time- and frequency-domain per-tone equalization techniques for orthogonal frequency division multiplexing (OFDM) transmission over time- and frequency-selective channels. It also presents one mixed time- and frequency...
[November 1, 2004, 23:00]
Wideband MC-CDMA And Rake Receivers For UEP With Wavelet Video Transmission Over AWGN And Rayleigh Fading Channels
White Papers Wideband Multicarrier code division multiple access (MCCDMA) and Rake receivers for wavelet video transmission with four levels of unequal error protection (UEP) codes over additive white Gaussian noise (AWGN) and Rayleigh fading channels are...
[July 25, 2004, 0:00]
Financial Services Institutions - Maximize The Effectiveness Of Your Web Channels
White Papers The insights gained from Web analysis can be applied across all contact channels. Financial services institutions can turn to an external provider that hosts sophisticated Web analytics. The ASP model is ideal for an industry that needs a fast...
[October 13, 2005, 0:00]
MIMO-OFDM Channel Estimation For Correlated Fading Channels
White Papers This paper presents MIMO-OFDM channel estimation for spatially correlated channels using frequency domain estimation techniques. First, the exploitation of spatial correlation on further improving the channel estimates is investigated.
[August 7, 2007, 0:00]
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...
[November 1, 2004, 23:00]
Time-Domain Channel Shortening And Equalization Of OFDM Over Doubly-Selective Channels
White Papers This paper discusses time-domain equalization of OFDM over doubly-selective channels. This paper considers the most general case, where the channel delay spread is larger than the cyclic prefix (CP), which results into inter-block interference (IBI).
[October 21, 2004, 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, 0:00]
An Enhanced Quality Of Service Method For Guaranteed Bitrate Services Over Shared Channels In EGPRS Systems
White Papers The goal of this paper is to present a complete Quality Of Service (QoS) framework for the Radio Resource Management (RRM) able to provide guaranteed bitrate (GBR) services, when they are transmitted over shared channels in a Enhanced General...
[March 21, 2005, 23:00]
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, 0:00]
Performance Of Clustered OFDM With Low Density Parity Check Codes Over Dispersive Channels
White Papers The main advantage of orthogonal frequency division multiplexing (OFDM) is that it allows transmission over frequency selective channels with a low receiver implementation complexity. This paper presents a new LDPC coded clustered OFDM system with...
[November 1, 2004, 23:00]
Per-Tone Equalization For OFDM Over Doubly-Selective Channels
White Papers This paper proposes a per-tone frequency-domain equalization approach for OFDM over doubly-selective channels. It considers the most general case, where the doubly-selective channel delay spread is larger than the cyclic prefix (CP), which results...
[October 21, 2004, 0:00]
Performance Of Antenna Selection For MIMO-OFDM Systems Based On Measured Indoor Correlated Frequency Selective Channels
White Papers This paper presents and compares antenna selection strategies for frequency selective MIMO-OFDM channels. Real channels are measured, and used to evaluate performance. The paper shows that the capacity gain predicted from the simulated channels, is...
[April 11, 2007, 0:00]
Design Tradeoffs In OFDMA Uplink Traffic Channels
White Papers For fixed and portable applications where the propagation channels are near static, it is shown that maximum throughput can be achieved through intelligent channel allocation when uplink channels are configured with minimum frequency diversity.
[November 1, 2004, 23:00]
The Proper Channels
White Papers In Part 1 of this series covering the most important J2SE 1.4 features for enterprise programmers, the author discussed channels. In this paper, the author introduces the New I/O (NIO) Buffer class, and explains how channels and buffers work...
[October 11, 2006, 0:00]
Data-Aided Timing Offset Estimation For Frequency Selective Fading Channels
White Papers A novel algorithm for Timing offset estimation is proposed in this paper for GSM and GPRS handsets, especially for multi-path channels with large delay-spread. The timing offset leads to errors in the channel response estimation with a consequent...
[November 21, 2005, 23:00]
Performance Of Coded OFDM In Very Shallow Water Channels And Snapping Shrimp Noise
White Papers Although acoustic energy has been used effectively for point-to-point communications in deepwater channels, it has had limited success for horizontal transmissions in shallow water. Time-varying multipath propagation and non-Gaussian snapping...
[April 11, 2007, 0:00]
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, 0:00]
On Performance Limits Of MIMO-OFDM Systems Over Block-Fading Channels
White Papers This paper investigates the effect of system parameters on performance limits of space-time-frequency coded OFDM systems over block-fading channels. For this purpose, the authors obtain a sphere packing lower bound on average word error probability...
[April 13, 2007, 0:00]
Real-Time Linux Dynamic Clamp: A Fast And Flexible Way To Construct Virtual Ion Channels In Living Cells
White Papers Conductances can be represented in deterministic form, or more accurately as discrete collections of stochastically gating ion channels. This paper describes a system for real-time control of biological and other experiments.
[April 18, 2007, 0:00]
