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This paper presents a disturbing recovery approach for lower extremity exoskeletons with passive ankle joints, which particularly works when an external disturbance is applied on the standing exoskeleton. Firstly, by analyzing the mechanical structure of lower extremity exoskeletons during its stance phase, the mathematical model is established using state-space equations. Then, on the basis of LQR...
This letter investigates an achievable channel coding rate and mean delay of point-to-point energy harvesting wireless communication system with finite blocklength, which has vital practical interest. We get the achievable channel coding rate’s exact formula and find it increases along with blocklength. Furthermore, the mean delay’s lower-bound is also obtained.
This paper presents three algorithms to suppress sidelobe of images produced by both RDA and CSA imaging algorithms. The first is windowed RDA (W-RDA) and windowed CSA(W-CSA) which decreases the sidelobe and increases the signal-to-noise ratio. The second is spatially variant apodization RDA and CSA (SVA-RDA and SVA-CSA) which weighs the amplitude of each point in frequency domain and then suppresses...
Base on Tersoff and Lernnard-Jones potentials, molecular dynamics simulation of nanoindentation experiment on single layer rectangular graphene film is carried out. A typical force-displacement curve is obtained and the effects of various factors including indenter radius, velocities as well as boundary conditions on the simulation results are discussed. The Young's modulus and the strength of the...
Each UE can aggregate multiple component carriers (CCs) as a wider band to support the demand of higher data rates in LTE-Advanced (LTE-A) systems with carrier aggregation (CA). An appropriate CC selection is necessary in order to improve the utility of CA, since not all CCs benefit from CA due to bad channel quality of some CCs. Most of existing methods only take one aspect of problems into account...
Performance degradation of Cell Centre UEs (CCUs) and "Interference Flooding" phenomenon may happen in Single-Carrier Frequency Division Multiplexing Access (SC-FDMA) uplinks. To decrease the impact of Interference Flooding and improve the CCUs' throughputs, this paper proposes a UE-Interfering-Area (UIA) based Inter-Cell Interference Coordination (IOC) scheme. Using UIA scheme, the eNodeB...
Time-of-arrival (TOA) estimator design for impulse radio ultra-wideband (IR-UWB) ranging demands high sampling rate high resolution ADC, which is difficult to implement. Some tradeoffs can be made such as limiting amplitude resolution. In this paper, we propose a two-step threshold selection TOA estimator using a two-bit ADC. The quantization threshold of ADC is set as the coarse threshold to distinguish...
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