Proceedings ArticleDOI
Space-time-frequency multiuser detection over fast-fading multipath channels for synchronous DS-CDMA systems
Ozgur Ertug,Buyurman Baykal +1 more
- Vol. 2, pp 1503-1507
TLDR
In this paper, the authors developed linear space-time-frequency multiuser detectors based on decorrelating and MMSE interference suppression techniques to operate over the fast-fading multipath synchronous CDMA channels.Abstract:
RAKE receivers suffer degradation in performance under fast fading due to errors in channel state estimation. The wide-sense stationary uncorrelated scatterer channel model lends itself to time-frequency canonical representation, and provides additional diversity in the frequency axis. Using the joint spatial-multipath-Doppler diversity model based on this canonical representation with multiple antennas, we first develop linear space-time-frequency multiuser detectors based on decorrelating and MMSE interference suppression techniques and further present nonlinear space-time-frequency decision-driven multiuser detectors based on interference cancellation ideas to operate over the fast-fading multipath synchronous CDMA channels. Simulation results based on realistic fast-fading assumptions demonstrate that the nonlinear detectors present improved bit-error-rate performance over the linear detectors and all proposed detectors exhibit significant resistance to the near-far effect.read more
Citations
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Proceedings ArticleDOI
Space-time pre-RAKE multiuser transmitter precoding for DS-CDMA systems
TL;DR: A novel linear precoding method that combines multiuser interference (MAI) cancellation, pre-RAKE filtering and transmitter (Tx) antenna diversity is proposed for the downlink of the code division multiple access (CDMA) channel and it is demonstrated that this method has better performance than single user space-time pre- RAKE precoding with relatively low increase in complexity.
Book ChapterDOI
Structural and semantic modeling of audio for content-based querying and browsing
TL;DR: In this article, the authors integrate the three aspects of content-based audio management into a single framework and propose an efficient method for flexible querying and browsing of auditory data, where the clients can express their queries in the form of point, range and k-nearest neighbor, which are particularly significant in the multimedia domain.
Journal ArticleDOI
Performance Analysis of a Wireless CDMA Transmission System with Receiver Diversity Schemes
TL;DR: To carryout performance analysis of a DS-CDMA wireless communication system with single transmitter and multiple receiver (SIMR), BER expression is developed considering the MRRC combining technique.
Journal Article
Structural and semantic modeling of audio for content-based querying and browsing
TL;DR: The proposed system provides a wide range of opportunities to query and browse an audio data by content, such as querying and browsing for a chorus section, sound effects, and query-by-example, which are particularly significant in the multimedia domain.
References
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Journal ArticleDOI
Linear multiuser detectors for synchronous code-division multiple-access channels
R. Lupas,Sergio Verdu +1 more
TL;DR: Under the assumptions of symbol-synchronous transmissions and white Gaussian noise, the authors analyze the detection mechanism at the receiver, comparing different detectors by their bit error rates in the low-background-noise region and by their worst-case behavior in a near-far environment.
Journal ArticleDOI
Joint multipath-Doppler diversity in mobile wireless communications
Akbar M. Sayeed,Behnaam Aazhang +1 more
TL;DR: Performance analysis shows that even the relatively small Doppler spreads encountered in practice can be leveraged into significant diversity gains via the new approach to diversity in spread-spectrum communications over fast-fading multipath channels.
Journal ArticleDOI
Multiuser detection in fast-fading multipath environments
TL;DR: Analytical and simulated results demonstrate that the proposed multiuser detectors promise substantially improved performance compared to existing systems due to the inherently higher level of diversity afforded by multipath-Doppler processing.
Journal ArticleDOI
Canonical space-time processing for wireless communications
TL;DR: A canonical space-time characterization of mobile wireless channels is introduced in terms of a fixed basis that is independent of the true channel parameters and provides a robust representation of the propagation dynamics.
Journal ArticleDOI
EM-based multiuser detection in fast fading multipath environments
TL;DR: This work uses a previously introduced time-frequency Rake receiver based on a canonical formulation of the channel and signals to simultaneously combat fading and multipath effects, and uses the Doppler spread caused by rapid time-varying channel as another means of diversity.