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This paper concerns the uplink of multicell multiuser multiple-input multiple-output (MIMO) systems. To tackle the effect of pilot contamination that is generally viewed as a bottleneck in previous work, this paper presents a superimposed pilot (SP)-aided uplink channel estimation scheme and mathematically characterizes the impact that an SP has on the performance of such a very large MIMO system...
An approach of superimposed training (ST) aided time-varying (TV) channel estimation for Orthogonal Frequency Division Multiplexing (OFDM) systems is presented. By modeling the channel as complex exponential bases, channel estimation is adopted over multiple OFDM symbols by using a sequence of data-dependent ST signal. Simulations illustrate the proposed channel estimator achieves a satisfactory estimation...
Analyzing the attributions and characters of unsafe behaviors and incidents can help to select pre-control measures more targeted. First, using the original material analysis, scale investigation and sampling interview, the characters of time, place, unit, main causes, shift, frequency of unsafe behaviors and accidents are discovered in the researched enterprise; secondly, the attributions at different...
The volatility of load time series is noteworthy in load forecating analysis. Considering the characteristic of time-varying variance, a feasible method of short term load forecasting based on Stochastic Volatility (SV) models is presented. The Quasi Maximum Likelihood Estimate (QMLE) is brought in to specify the standard SV model. The model is transformed into state space form, and the Kalman filter...
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