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• W2184418621 abstract "ireless communications systems of the future, such as fourth generation (4G), will provide networked multimedia communications, will be characterized by very high data rates of up to 1 Gb/s or more, and will operate in environments rich in multi-user interference. The high data rates inevitably give rise to severe frequency selectivity and multipath interference in the wireless channels. Multipath channels pose many challenging signal processing problems for designers of high-performance receivers. Transmission techniques that can overcome channel selectivity, such as code-division multiple access (CDMA) and orthogonal frequency-division multiplexing (OFDM), are being intensely investigated. At the same time, however, the scattering-rich environment engendered by the presence of multiple propagation paths leads to tremendous potential diversity gains that can be exploited through the use of suitable transmission/reception strategies such as multiple-input multiple-output (MIMO) techniques. In addition, MIMO systems may yield a rate gain, thanks to their ability to generate a multiplicity of parallel channels. Space-time coding schemes allowing one to benefit from multipath diversity to increase the capacity of wireless channels are now well understood and established. While multipath propagation problems seem to have been largely overcome by these recent advances, the capacity of the network still seems ultimately limited by interference caused by the presence of multiple users simultaneously trying to access network resources. Multi-user interference cancellation on multipath channels presents even greater challenges in signal processing. This special issue provides an up-to-date survey on key physical layer technologies for realizing future wireless communications systems. The group of articles presented in this issue begins with an invited article by F. Adachi et al. It presents in a tutorial manner the state of the art in the research on broadband CDMA techniques for high-speed wireless access. Both direct-sequence CDMA (DS-CDMA) and multicarrier CDMA (MC-CDMA) are covered, together with the frequency domain equalization (FDE) techniques that are essential for the receiver in both cases. While MC-CDMA has been the preferred technique, it is now realized that DS-CDMA with FDE has comparable error performance. The authors argue that both MC- and DSCDMA are equally promising broadband access methods for 4G systems. The second article, by J. Andrews, presents an overview of interference cancellation for cellular systems. It explains why the current generation of wireless receivers has not widely embraced multi-user interference cancellation, despite the performance improvements promised by the latter, as documented by the enormous amount of research over the last two decades. While today’s receivers, by and large, treat interference as background noise, this article argues that current and future trends will increase the need for and viability of multi-user receivers for both the uplink and downlink. Downlink interference cancellation" @default.
• W2184418621 created "2016-06-24" @default.
• W2184418621 creator A5053017592 @default.
• W2184418621 date "2005-01-01" @default.
• W2184418621 modified "2023-09-27" @default.
• W2184418621 title "MODULATION, CODING AND SIGNAL PROCESSING FOR WIRELESS COMMUNICATIONS" @default.
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