Results 241 to 250 of about 88,055 (289)

Adaptive LDPC for Rayleigh fading channel

Proceedings. ISCC 2004. Ninth International Symposium on Computers And Communications (IEEE Cat. No.04TH8769), 2004
Two adaptive coded modulation schemes employing LDPC (low-density parity-check) code are proposed for Rayleigh fading channels. Scheme 1: we fix the code rate (rate=1/2), and only change the modulation methods according to the channel state, that is, during poor channel conditions, QPSK modulation is employed, as channel conditions improve, more ...
Yuling Zhang, Dongfeng Yuan, Haigang Zhang   +2 more
openaire   +1 more source

Constellations matched to the Rayleigh fading channel

IEEE Transactions on Information Theory, 1996
Summary: We introduce a new technique for designing signal sets matched to the Rayleigh fading channel. In particular, we look for \(n\)-dimensional \((n\geq 2)\) lattices whose structure provides \(n\)th-order diversity. Our approach is based on a geometric formulation of the design problem which in turn can be solved by using a number-geometric ...
Xavier Giraud, Jean-Claude Belfiore
openaire   +2 more sources

MIMO rayleigh-product channels with co-channel interference

IEEE Transactions on Communications, 2009
This paper presents an analytical performance investigation of an interference-limited double scattering multiple-input multiple-output (MIMO) channel employing optimum combining. Our main contribution is the derivation of the closed-form expressions for the cumulative distribution function (c.d.f.) and probability density function (p.d.f.) of the ...
Caijun Zhong, Shi Jin 0002, Kai-Kit Wong
openaire   +1 more source

Bounds on the expected optimal channel assignment in Rayleigh channels

2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2012
The channel assignment problem is highly important to OFDMA cognitive radio systems. Tight bounds on the optimal channel assignment are crucial for the performance evaluation of various channel assignment schemes. In this paper we derive the mean of the maximal sum rate channel assignment for i.i.d Rayleigh fading channels.
Oshri Naparstek, Amir Leshem
openaire   +1 more source

Channel and Crustal Rayleigh Waves

Geophysical Journal International, 1972
Summary For a structure containing even a slight low-velocity channel in the upper mantle, the collection of higher mode Rayleigh waves decomposes naturally into a family of LVC channel waves and a family of crustal waves. Only the fundamental mode and the crustal waves need be considered as exciting Rayleigh waves significantly, since the channel ...
G. F. Panza, F. A. Schwab, L. Knopoff
openaire   +1 more source

Channel parameter estimation in Rayleigh fading channel

Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 2005
In wireless communication environments such as indoors and in a relatively narrow region for which applications have recently started, the information transmission speed is sufficiently faster than the fading variation. In such cases, the fading variation can be viewed as a colored probability process with autocorrelation.
Hirohisa Gambe, Kenji Yokoyama, Miyoshi Saito, Kiyomichi Araki   +3 more
openaire   +1 more source

TCM and diversity in a Rayleigh fading channel

5th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless Networks - Catching the Mobile Future., 2002
The performance of trellis coded 8-PSK with diversity is examined in the paper. The "pragmatic" approach to TCM is assumed, where the code is constructed using a common a rate 1/2 constraint length 7 codec. Using diversity in the form of soft symbol combining in a concatenated TCM/diversity modulation, a performance improvement of about 2 to 3 dB was ...
openaire   +1 more source

On SIR fade statistics in Rayleigh-lognormal channels

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003
An analytical approach to derive the level crossing rate (LCR) and the average fade duration (AFD) for the signal-to-interference ratio (SIR) in a mobile radio system is proposed. The channel model is characterized by a log-normal shadowing component and a Rayleigh fast fading component on the useful link and on interfering links.
GRAZIOSI, FABIO, SANTUCCI, FORTUNATO
openaire   +2 more sources

Product Construction of Codes for Rayleigh-Fading Channels

IEEE Transactions on Information Theory, 2006
Coded modulation scheme of high coding gain is presented for slowly-varying flat fading channels. The scheme introduces a product construction employing two types of codes: "standard" good codes and codes that are more suitable for the fading channel. Short-blocklength codes of unique features are thus obtained.
Amir J. Salomon, Ofer Amrani
openaire   +1 more source

Polar Codes for the Rayleigh Fading Channel

IEEE Communications Letters, 2013
The application of polar codes for the Rayleigh fading channel is considered. We construct polar codes for the block Rayleigh fading channel with known channel side information (CSI) and for the Rayleigh channel with known channel distribution information (CDI).
openaire   +1 more source