In this paper, different techniques for the estimation of the signal parameters and/or the channel coefficients for single-input/multiple-output systems, arc presented. These methods arc based, cither on the use of a ...
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We derive the transmit Wiener filter for DS-CDMA systems which depends upon the noise power at the receivers. We show that the transmit Wiener filter converges to the transmit matched filter and the transmit zero-forc...
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The influence of a cyclic prefix on the spectral power density of discrete-time, zero-mean, cyclo-stationary, random sequences is investigated. Analytical expressions for the time-varying autocorrelation function, the...
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We present space-time transmit filters for FDD DS-CDMA systems based on partial channel state information, i. e. we do not take into account the channel coefficients. Although the FDD transmit zero-forcing filter seem...
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This paper addresses the optimization of constrained stationary Markov input processes which achieve high information rates on intersymbol-interference (ISI) channels. The considered-Markov processes define an optimiz...
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ISBN:
(纸本)9781424469901
This paper addresses the optimization of constrained stationary Markov input processes which achieve high information rates on intersymbol-interference (ISI) channels. The considered-Markov processes define an optimized subset of equiprobable input symbols for each channel state and are thus uniquely described by the set of branches in a trellis section. We propose an iterative algorithm that efficiently solves the optimization problem. The algorithm successively removes the worst branches and thereby constructs a reduced trellis code that is matched to the channel. The second contribution of this paper are tight lower bounds for the mutual information rate (MIR) of Markov sources on ISI channels with finite input and output alphabets. The bounds can be evaluated within a small trellis window without using Monte Carlo methods.
We report on our research about the multistreaming capability of electrically small antenna arrays. It is shown that the near-field interaction of the closely spaced antennas accounts for a surprisingly good multistre...
We consider the downlink of a cellular network with multiple antenna base stations (BS) and single antenna mobile devices (MD). Whenever a BS changes its beamforming strategy, it changes the intercell interference (IC...
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In modern wireless communication systems, scheduling and resource allocation are two closely related tasks of the medium access control (MAC) and physical (PHY) layers respectively. In this paper, we present a separat...
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In this paper1, we provide an accurate and fully analytical model for the distortion due to lost frames in wireless video transmission. Our analysis combines the properties of the video sequence and those of the wirel...
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