Exploració per tema "Time-varying channels"
Ara es mostren els items 7-11 de 11
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Joint antenna diversity and combined DFE/decoding of trellis coded modulation on frequency-selective fading mobile radio channels
(Institute of Electrical and Electronics Engineers (IEEE), 1993)
Text en actes de congrés
Accés obertA Monte Carlo simulation study of a combined FDMA/TDMA slow frequency-hopping trellis coded adaptive receiver for multipath Rayleigh fading channels is presented. The receiver structure, first proposed by Proakis (1989) ... -
New receivers for DS-SS in time variant multipath channels based on the PN alignment concept
(Institute of Electrical and Electronics Engineers (IEEE), 2000)
Text en actes de congrés
Accés obertWe present new combined blind equalization and detection schemes for a DS-SS system. The new proposed algorithms improve the bit error rate compared to traditional RAKE receivers in time-variant channels with multipath. ... -
On the inclusion of channel's time dependence in a hidden Markov model for blind channel estimation
(BOB WERNER IEEE COMPUTER SOCIETY PRESS, 1996)
Text en actes de congrés
Accés obertWe introduce several modifications to the Baum&Welch (BW) formulas used to reestimate the parameters of a hidden Markov model (HMM). The estimated parameter is the channel impulse response (CIR) of a communication system ... -
Optimum energy allocation for massive spread-spectrum multiple access in networks of uncoordinated energy-limited terminals
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Text en actes de congrés
Accés obertThis paper derives the energy allocation policy that maximizes the aggregate spectral efficiency of an uncoordinated spread-spectrum multiple access network operating in the large-user regime and subject to a longterm ... -
Space-time coding for UMTS. Performance evaluation in combination with convolutional and turbo coding
(Institute of Electrical and Electronics Engineers (IEEE), 2000)
Text en actes de congrés
Accés obertSpace-time codes provide both diversity and coding gain when using multiple transmit antennas to increase spectral efficiency over wireless communications systems. Space-time block codes have already been included in the ...