Results 221 to 230 of about 12,474 (262)
Some of the next articles are maybe not open access.
IEEE Communications Magazine, 1980
Adaptive processing can reduce the effects of fading on beyond-the-horizon digital radio links. Two radio propagation channels for beyond-thehorizon communications, troposcatter, and HF are currently being reexamined. In the past, transmission over these radio channels had been considered unreliable due to fading effects.
openaire +1 more source
Adaptive processing can reduce the effects of fading on beyond-the-horizon digital radio links. Two radio propagation channels for beyond-thehorizon communications, troposcatter, and HF are currently being reexamined. In the past, transmission over these radio channels had been considered unreliable due to fading effects.
openaire +1 more source
Modeling wireless channel fading
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211), 2002We compare measured fading data with the popular Rayleigh model. Our results show that this model does not agree with the experimental data. As an alternative, we approximate the experimental data using autoregressive moving average (ARMA) models. To validate the models, we compare several characteristics of fading obtained analytically, by simulation,
William Turin +3 more
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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.
openaire +1 more source
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
openaire +1 more source