Results 251 to 260 of about 865,703 (290)

Signaling constellations for fading channels

IEEE Transactions on Communications, 1999
The 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, Norman C. Beaulieu, Paul H. Wittke   +2 more
openaire   +1 more source

Multilevel Coding for Fading Channels

2007 IEEE International Symposium on Information Theory, 2007
This 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   +2 more sources

Feedback Communications in Fading Channels

IEEE Transactions on Communications, 1974
A 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

Diversity transform for fading channels

IEEE Transactions on Communications, 1996
This 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   +2 more sources

Ergodic channel capacity for generalized fading channels

2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014
The ergodic channel capacity (ECC) of single-branch receivers is studied under the scenarios described by means of α-η-μ, α-к-μ, and α-λ-μ-η generalized fading channels. Novel expressions are derived, which are the most general in this scientific area.
Anastasios K. Papazafeiropoulos, Tharmalingam Ratnarajah   +1 more
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., 2002
The 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, Witold A. Krzymien, Paul Goud   +2 more
openaire   +1 more source

On the capacity of generalized-k fading channels

IEEE Transactions on Wireless Communications, 2007
This 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, Mohamed-Slim Alouini, Sofiène Affes, Alex Stephenne   +3 more
openaire   +3 more sources

Distortion Exponent of Parallel Fading Channels

2006 IEEE International Symposium on Information Theory, 2006
We consider the end-to-end distortion achieved by transmitting a continuous amplitude source over M parallel, independent quasi-static fading channels. We analyze the high SNR expected distortion behavior characterized by the distortion exponent. We first give an upper bound for the distortion exponent in terms of the bandwidth ratio between the ...
Deniz Gündüz, Elza Erkip
openaire   +1 more source

Generalized decorrelators for fading channels

Proceedings International Conference on Information Technology: Coding and Computing, 2002
An 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.
openaire   +2 more sources

Estimation of fast fading channels in OFDM

2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609), 2003
In this paper, we investigate OFDM transmission over fast fading channels. In such scenarios, the Doppler spread of the channel and synchronization errors cause intercarrier interference (ICI) and complicate channel estimation because the channel cannot be assumed constant during the transmission of an OFDM block.
Stamoulis, A., Diggavi, S. N., Al-Dhahir, N.   +2 more
openaire   +2 more sources