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- Falahati, Sorour, 1971, et al.
(author)
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EU FP6 IST-2003-507581 WINNER, D2.4 Assessment of adaptive transmission technologies, Feb 2005
- 2005
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Reports (other academic/artistic)abstract
- This document contains a first assessment of adaptive transmission schemes and how these fitto the different WINNER scenarios. It focuses on an adaptation due to the channel properties that mayvary both in time and frequency or, with respect to the selected antennas, in an OFDM-based air interface.Besides the evaluation by analysis, link simulation and multilink simulation, first detailed designs arepresented of adaptive transmission feedback systems for the WINNER FDD and TDD physical layermodes.
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- Ström, Erik, 1965, et al.
(author)
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An Introduction to Spread Spectrum Systems
- 2002
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Reports (other academic/artistic)abstract
- This report is a tutorial introduction to spread spectrum communicationsystems, and it should be accessible for a reader who has basic knowledge ofdigital modulation and channel coding. The authors have chosen to presentthe more advanced topics in the report from a signal space and channel codingpoint of view. While other approaches are certainly possible, the authorsfeel that the chosen approach is the most beneficial for the communicationsengineer. Since the original applications for spread spectrum systems weremilitary, we will introduce spread spectrum links as a means of overcomingintentional jamming. The reader who dislikes military applications may becomforted by the fact that the problem of communicating in the presenceof jamming is very much akin to the problem of communicating over fadingchannels. Hence, by finding out how to defeat jamming by spread spectrumwill also reveal how to overcome fading. Today, spread spectrum linksare also used in many civilian systems to overcome nonintentional jamming(or interference), and the report is concluded with an overview of currentcommercial spread spectrum systems.The authors welcome comments and corrections to the material. Pleasesend these to Erik Ström at erik.strom@s2.chalmers.se.
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- Zhao, Hongxia, 1971, et al.
(author)
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Performance of a Decorrelator in Convolutionally Coded WCDMA Systems
- 2005
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Reports (other academic/artistic)abstract
- The objective of this paper is to study the performance of a linear multiuser detector (a decorrelator) in a convolutionally encoded wideband code-division multiple-access (WCDMA) system. The study, which is valid for a traditional detection scheme, where the decorrelator and the channel decoder work separately, shows that the single-user detector (the Rake receiver) performs better than the decorrelator at low signal-to-noise ratios (SNRs). The SNR range, in which the Rake receiver outperforms the decorrelator, is influenced by the error correction capability of the channel code and the load of the system. In particular, a WCDMA speech service is evaluated. Simulations show that the Rake receiver is superior to the decorrelator when targeting a required bit-error rate (BER) of 10^{-3}.
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