Time-varying impairments to OFDM signals can severely degrade the subcarrier orthogonality. In this paper, we analyze the ICI over time-varying channels, and present the method for analyzing the SIR. According to the ...Time-varying impairments to OFDM signals can severely degrade the subcarrier orthogonality. In this paper, we analyze the ICI over time-varying channels, and present the method for analyzing the SIR. According to the results of simulation, we find frequency offset and Doppler spread can both degrade the performance of OFDM systems.展开更多
This paper considers the integrability for the Jacobian of orientation-preserving forms in anisotropic Sobolev classes. The main result is a sufficient condition ensuring integrability of the Jacobian, which can be re...This paper considers the integrability for the Jacobian of orientation-preserving forms in anisotropic Sobolev classes. The main result is a sufficient condition ensuring integrability of the Jacobian, which can be regarded as a refinement of the result of Iwaniec and Sbordone.展开更多
Theoretical analysis and experimental measurement of the multiple dimples in thermal elastohydrodynamic lubrication (TEHL) point contacts have been carried out. Good agreement is found between the theoretical and expe...Theoretical analysis and experimental measurement of the multiple dimples in thermal elastohydrodynamic lubrication (TEHL) point contacts have been carried out. Good agreement is found between the theoretical and experimental results. A thermal multi-spike theory is proposed to explain the multi-dimple phenomena.展开更多
文摘Time-varying impairments to OFDM signals can severely degrade the subcarrier orthogonality. In this paper, we analyze the ICI over time-varying channels, and present the method for analyzing the SIR. According to the results of simulation, we find frequency offset and Doppler spread can both degrade the performance of OFDM systems.
基金supported by the National Natural Science Foundation of China(Grant No.10471149)Mathematics Tian Yuan Youth Foundation(Grant No.A0324610)Doctoral Foundation of the Department of Education of Hebei Province(Grant No.B2004103).
文摘This paper considers the integrability for the Jacobian of orientation-preserving forms in anisotropic Sobolev classes. The main result is a sufficient condition ensuring integrability of the Jacobian, which can be regarded as a refinement of the result of Iwaniec and Sbordone.
基金This work was supported partly by the Visiting Scholar Foundation of the Laboratories ofColleges Universities of the Ministry of Education+1 种基金 People's Republic of China partly by the Satellite Venture Business Laboratory of Kyushu Institute of Tech
文摘Theoretical analysis and experimental measurement of the multiple dimples in thermal elastohydrodynamic lubrication (TEHL) point contacts have been carried out. Good agreement is found between the theoretical and experimental results. A thermal multi-spike theory is proposed to explain the multi-dimple phenomena.
