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Wireless sensor networks (WSN) normally consist of lots of energy-limited sensor nodes, the problem of how to extend the lifetime of network with the consideration of coverage-preserving is worthy of study. An energy triggered coverage-preserving node scheduling scheme is proposed in this paper. The scheme mainly includes initial scheduling phase and local wake-up scheduling phase, after initial scheduling,...
In the Internet today, multipath routing is proved a popular technique that improves reliability and robustness of data delivery; however, current forwarding algorithm over multipath network have problems such as lacking of preparing for sudden spikes. This paper proposes a new forwarding algorithm, which is based on time series prediction and PSO (particle swarm optimization). We describe how the...
Partial transmit sequence (PTS) is an efficient algorithm to solve the problem of high peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM), but its exhaustive search of phase factors results in high computational complexity. A PTS algorithm based on cyclic iteration (C-IPTS) is proposed to solve this problem. In the proposed algorithm, the phase factor achieved...
We consider the problem of estimating the central direction of arrival (DOA) of multiple coherently distributed sources. This problem is encountered due to the presence of local scatters in the vicinity of a transmitter or due to signals propagating through a random inhomogeneous medium. Since the integral steering vector of coherently distributed source can be deduced to be a Schur-Hadamard product...
The largest difference between cognitive radar and other adaptive radar is the adaptivity of transmitter in cognitive radar. How to optimally decide or select the radar waveform for next transmission based on the observation of past radar returns is one of the important issues. In this paper, with the stochastic dynamic programming model of waveform selection, we use the method of temporal difference...
According to the new features of traffic distribution, a novel forwarding migration algorithm (FMA) is proposed. Programmable routers (PR) are used in FMA. One PR sets FMA bit for unbalanced traffic. Another PR forwards related traffic to the FMA link rather than to wait for matching the longest address prefix. Theoretic analysis shows that FMA can reduce the forwarding burden of core router. Simulation...
We consider the problem of estimating the parameters-the central direction of arrival (DOA) and angular spread of a coherently distributed source. This problem is encountered due to the presence of local scatterers in the vicinity of a transmitter or due to signals propagating through a random inhomogeneous medium. Since the computational complexity of the parameter estimation is normally highly demanding,...
A new two-dimensional direction of arrival (2D DOA) estimation method is proposed, in this paper. The presented method makes using of blind source separation method based on the second-order identification to estimate the array response matrix. Via the rotational invariance techniques, we can estimate the 2D DOA from the array response matrix estimation. The estimated elevation angles and azimuth...
This paper proposes a new load balancing mechanism, called PPLR (prediction packet loss rate), which is based on time series prediction. Load balancing is needed in many fields; however, current approaches have problems such as lacking of preparing for sudden spikes. In this paper, we describe how PPLR dynamically predicts loss levels over all available network paths and adjust the allocation proportion...
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