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This paper analyzes the spectral efficiency of the incremental amplify-and-forward (AF) opportunistic relaying (OR) with outdated channel state information (CSI) over Rayleigh fading channels. According to the definition of distribution function, we obtain the cumulative distribution function (CDF) of the actual combined signal-to- noise ratio (SNR) received at the destination. Based on this CDF,...
The problem of detecting unknown and arbitrary sparse signals against background noise is considered. Under a fixed hypothesis-testing problem model, a scheme referred to as Likelihood Ratio Test with Sparse Estimate (LRT-SE) is proposed. The relation between the quality of the estimate and the detection performance is quantized through the Kullback-Leibler distance, which shows the performance of...
Distributed beamforming has the great potential of performance improvement in wireless networks while the carrier synchronization overhead will reduce its performance gain. In this paper the effects of carrier synchronization on link throughput of distributed beamforming is studied. The expressions of the frequency and initial phase used by each cooperative node are derived for the existing round-trip...
There has been considerable research into the performance of the enhanced IEEE 802.11e standard in recent years. Majority of the performance analysis has been based on simulations and analytical models, with little testing done in a real-world environment. We investigate the behaviors of the enhanced distributed channel access (EDCA) and legacy distributed coordination function (DCF) based on a testbed...
This paper describes a sensorless position estimation method for a permanent-magnet (PM) motor fed from a three-phase matrix converter using only its space-vector pulsewidth-modulation (SVPWM) sequence. The scheme employs measurements of dii/dt of the motor line currents to construct orthogonal ldquoresolverlikerdquo position signals. In principle, the SVPWM waveforms provide sufficient excitation...
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