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Operational software systems often experience an “aging” phenomenon, characterized by progressive performance degradation and a sudden hang/crash failure. Software rejuvenation is a proactive fault-tolerance strategy aimed to prevent unexpected outages due to aging. Existing rejuvenation approaches can be largely classified into two types:(More)
A covariance matrix based anti-interference algorithm is proposed for SIMO OFDM systems. This algorithm constructs the interference-blocking filter without the information of the inferences. This algorithm is insensitive to the time synchronization error and to the carrier frequency synchronization error. Therefore, it is especially useful for the case when(More)
Software is playing a more and more important role in a system, and more and more studies show that system failures are more due to software faults than due to hardware faults. Therefore, software reliability has been one of the hottest research topics. Recently, a phenomenon, "software aging" is reported. In order to counteract this phenomenon, a proactive(More)
A covariance-based algorithm is proposed to find the interference blocking filter for single-input multiple-output orthogonal frequency division multiplexing (SIMO OFDM) systems. The algorithm uses only the auto-covariance matrix of the received signal. It does not require precise carrier synchronization and time synchronization, so it is applicable to an(More)
The topics of lifting the capacity and blocking the interferences of MIMO wireless systems are studied. The interferences can be blocked by filter design but with the consequence of noise enhancement and thus reduce the capacity. Or, the capacity can be maintained by filter design but some interference has to be accepted. In this paper, we present a new(More)
The motions of the particles on the substrate of a drying sessile colloidal droplet of water were measured using multiparticle tracking. Droplets with different concentrations (0-250 mM) of sodium chloride (NaCl) were compared. Several statistical quantities were proposed to characterize the heterogeneous behaviors of the particles and distinguish the(More)
Taking the pairwise error probability (PEP) as the performance criterion and exploiting the channel covariance information at the transmitter, this paper studies the optimal linear precoder design of the correlated multiple-input multiple-output (MIMO) wireless system. The precoder can be used along with any space-time block codes (STBC), which is an(More)
It has been shown recently that the point-to-point capacity can be significantly increased if multiple transmitting and receiving (MIMO) antennas are used [1], [2], [3] and [4]. Since the MIMO channel depends on the relative positions and the relative beam directions of their antennas, it may be interesting to find the limitation of the capacities of MIMO(More)