Results 271 to 280 of about 32,936 (311)
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Feedback Communications in Fading Channels
IEEE Transactions on Communications, 1974A communication system using noiseless feedback for Rayleigh fading channels is proposed. Pilot tone signaling is used to provide channel amplitude and phase information for the detection of antipodal signals. Channel estimates generated in the receiver are fed back to control the transmitter power and rate.
R. Srinivasan, R. L. Brewster
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Multilevel Coding for Fading Channels
2007 IEEE International Symposium on Information Theory, 2007This paper proposes a multilevel coding system with linear mapping for fading channels. The receiver performs multi-stage decoding. Each stage employs the decision-aided successive estimation and decoding method that decouples the channel estimation and decoding without loss of information.
Mei Chen, Oliver M. Collins
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On coding for block fading channels
IEEE Transactions on Information Theory, 2000Summary: This work considers the achievable performance for coded systems adapted to a multipath block-fading channel model. This is a particularly useful model for analyzing mobile-radio systems which employ techniques such as slow frequency-hopping under stringent time-delay or bandwidth constraints for slowly time-varying channels.
Raymond Knopp, Pierre A. Humblet
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Deterministic Combining for Fading Channels
2009 IEEE International Conference on Communications, 2009For a communication system employing receive diversity in flat Rician fading, we consider linear combining receivers with deterministic weights. Two receiver structures are proposed: (1) a modified maximum likelihood receiver in which detection is performed by maximizing the likelihood function of the combined received signal, (2) a deterministic ...
Ranjan K. Mallik, Jack H. Winters
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Signaling constellations for fading channels
IEEE Transactions on Communications, 1999The performance of various coherent 8-ary and 16-ary modulations in additive white Gaussian noise (AWGN) and slowly fading channels are analyzed. New expressions for the exact symbol error rates (SER) in fading with diversity combining are derived for any two-dimensional signaling format having polygonal decision boundaries.
Xiaodai Dong +2 more
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Microdiversity on rician fading channels
IEEE Transactions on Communications, 1994formats, coherent phase shift keying (CPSK) and -noncoherent frequency shift keying (NCFSK). Results using both maximal ratio combining (MRC) and selection diversity combining (SC) are presented for comparison. Our results show that from a feasibility and practical tradeoffs point of view, the performance of an EG combiner may be as good as that of a ...
Adnan A. Abu-Dayya, Norman C. Beaulieu
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Diversity transform for fading channels
IEEE Transactions on Communications, 1996This paper investigates a transform that provides diversity to words of symbols transmitted over fading channels. This diversity transform (DRT) does not alter the distance between the input words nor the bandwidth or the information rate. The transform is based on an orthonormal transform and thus increases the channel alphabet.
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Adaptive channel precoding for slowly fading channels
5th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless Networks - Catching the Mobile Future., 2002The bit error rate (BER) performance of a mobile or personal radio digital communications system at a high bit rate can be increased significantly by intersymbol interference (ISI) due to multipath propagation. In this paper, a novel adaptive channel precoder is proposed to improve the system performance with-out increasing the complexity of the ...
Weihua Zhuang +2 more
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Generalized decorrelators for fading channels
Proceedings International Conference on Information Technology: Coding and Computing, 2002An iterative pilot symbol aided detector for random multipath fading channels that does not neglect intersymbol interference (ISI) is studied for a CDMA uplink system with multiple receiver antennas. The algorithm resolves the received signals at each antenna into components corresponding to each path for every user.
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On the capacity of generalized-k fading channels
IEEE Transactions on Wireless Communications, 2007This paper investigates the capacity of generalized- K fading channels. This very general model describes accurately composite multipath/shadowing fading channels which are widely encountered in real-world environments. We derive closed-form expressions for three adaptive transmission techniques, namely, i) optimal rate adaptation with constant power ...
Amine Laourine +3 more
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