Results 211 to 220 of about 1,713 (254)

MIMO antenna system for frequency selective fading channels

11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525), 2002
In this paper, we investigate the use of MIMO antenna system to maximize the average SINR of each packet in the system, with prior knowledge of the channel at the transmitter. Our approach is based on deriving an analytic formula for the average packet SINR and using the Lagrange multiplier method to determine an optimum. Our proposed solution provides
Kai-Kit Wong, Ross D. Murch, Khaled Ben Letaief   +2 more
openaire   +1 more source

A transmit diversity scheme for frequency selective fading channels

Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137), 2002
We propose a transmit diversity scheme for frequency selective fading channels using orthogonal frequency division multiplexing (OFDM). The transmit diversity scheme proposed by Alamouti (see IEEE JSAC, vol.16, no.8, p.1451-58, 1998) for flat fading channels is extended to the case when the channel has a delay spread.
Sriram Mudulodu, Arogyaswami Paulraj
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Optimal energy assignment for frequency selective fading channels

12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598), 2002
This paper describes a method to minimize the total energy necessary to communicate data over a frequency selective fading channel using multicarrier data transmission. The energy is minimized given a desired average bit error rate at a fixed gross bit rate. For a number of configurations, the optimal energy distribution is calculated analytically. For
Maarten Ditzel, Wouter A. Serdijn
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Bounds on the capacity of slow frequency selective fading channels

2006 IEEE International Conference on Communications, 2006
Although communication systems are often analyzed under the assumption of prior knowledge of the channel, this is rarely the case in practical systems, which usually need to estimate the channel from the received communication signal. The analysis of channel capacity in the absence of prior channel knowledge had gained increasing interest in recent ...
Itsik Bergel, Sergio Benedetto
openaire   +1 more source

Cooperation over frequency-selective fading relay channels

IEEE Transactions on Wireless Communications, 2008
We study information-rate calculations and coded cooperation strategies for relay channels with frequency-selective (FS) fading. We develop suitable channel trellises for the multiaccess and broadcast parts of the relay channel, and employ simulation-based techniques to calculate (approximate) ergodic information-rate bounds with FS Rayleigh fading ...
Jun Hu 0018, Tolga M. Duman
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Frequency Selective Fading on Wideband Mobile Radio Channels

IEEE Vehicular Technology Conference, 2006
Wideband indoor measurements were performed in different scenarios with a 300 MHz bandwidth chirp sounder to generate 100 channel impulse responses every one second. To study the frequency selective fading for OFDM and WCDMA systems, the 300 MHz bandwidth was divided into either 15 sections with 20 MHz bandwidth or into 60 sections with 5 MHz bandwidth.
Víctor Hinostroza, Sana Salous
openaire   +1 more source

Optimized delay diversity for frequency-selective fading channels

IEEE Transactions on Wireless Communications, 2005
This paper proposes an optimized delay diversity (ODD) scheme for frequency-selective fading channels. The novel scheme requires knowledge of the channel impulse response (CIR) autocorrelation matrix at the transmitter, but the CIRs themselves have to be available only at the receiver side.
Thorsten Hehn, Robert Schober, Wolfgang H. Gerstacker   +2 more
openaire   +1 more source

Belief propagation over frequency selective fading channels

IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2005
In this paper, we propose an iterative belief propagation (BP) based equalizer for frequency selective fading channels as an alternative to the typically used maximum a-posteriori (MAP), Viterbi, or soft output Viterbi algorithm (SOVA) based equalizers.
Mustafa Nazmi Kaynak, Tolga M. Duman, Erozan M. Kurtas   +2 more
openaire   +1 more source

Capacity of frequency selective fading channels

Proceedings of IEEE International Symposium on Information Theory, 2002
We derive a formula for the capacity of frequency selective fading channels, described by stationary ergodic processes. We express the capacity as an integral w.r.t. the limiting distribution of the eigenvalues of a particular channel matrix. We show that this distribution, and the capacity depend on the channel impulse response statistics only.
openaire   +1 more source

Blind equalization for fast frequency selective fading channels

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2002
This paper addresses the issue of blind adaptive maximum likelihood sequence estimation (BMLSE) using per survivor processing (PSP) over a fast frequency selective fading (FFSF) channel. Special care is dedicated to the choice of the adaptive filtering (AF) algorithm used and its influence on the receiver symbol error rate (SER) performance.
Juraci Ferreira Galdino, Marcelo Sampaio de Alencar   +1 more
openaire   +1 more source