Abstract: The present invention provides an application of a small-molecule compound in preparation of an antitumor drug. A series of small-molecule drugs with high brain tumor growth activity inhibitory properties are obtained, are docked to pharmacodynamic analysis of the small-molecule drugs, and do not need to be transferred to other testing platforms.

Abstract: An electric vehicle automatic charging system includes an electric vehicle including a receiving cavity with an opening and a shutter for closing the opening, a battery assembly receiving in the receiving cavity and a charging device. The battery assembly includes a battery pack including an electrode connecting member and a movable bracket including a magnetic member. The charging device includes a support table, a support plate, an electromagnetic fitting member being capable of generating a magnetic force for attracting the magnetic member, and a charger. When the shutter comes into contact with the support plate, the shutter changes from a closed state to an open state, the movable bracket drives the battery pack to move away from the receiving cavity along the support plate by the magnetic force until the electrode connecting member is electrically connected to the charger. An electric vehicle automatic charging method is also provided.

Abstract: An electric vehicle automatic charging system includes an electric vehicle including a receiving cavity with an opening and a shutter for closing the opening, a battery assembly receiving in the receiving cavity and a charging device. The battery assembly includes a battery pack including an electrode connecting member and a movable bracket including a magnetic member. The charging device includes a support table, a support plate, an electromagnetic fitting member being capable of generating a magnetic force for attracting the magnetic member, and a charger. When the shutter comes into contact with the support plate, the shutter changes from a closed state to an open state, the movable bracket drives the battery pack to move away from the receiving cavity along the support plate by the magnetic force until the electrode connecting member is electrically connected to the charger. An electric vehicle automatic charging method is also provided.

Abstract: An apparatus for detecting disconnection of a secondary side of a current transformer includes a sampling circuit coupled to the secondary side of the current transformer that samples signals from the secondary side of the current transformer. A pull-up circuit is switchably coupled to the sampling circuit in response to a coupling signal in a diagnostic phase. A processor is coupled to the sampling circuit for receiving sampled signals from the sampling circuit. The processor extracts corresponding signal information from the sampled signals and stores the extracted signal information in a memory. The extracted signal information corresponds to statuses that the secondary side of the current transformer is connected or disconnected to a load. A detector is coupled to the processor and the memory, and accesses the memory using the signal information of the sampled signals.

Abstract: An apparatus for detecting disconnection of a secondary side of a current transformer includes a sampling circuit coupled to the secondary side of the current transformer that samples signals from the secondary side of the current transformer. A pull-up circuit is switchably coupled to the sampling circuit in response to a coupling signal in a diagnostic phase. A processor is coupled to the sampling circuit for receiving sampled signals from the sampling circuit. The processor extracts corresponding signal information from the sampled signals and stores the extracted signal information in a memory. The extracted signal information corresponds to statuses that the secondary side of the current transformer is connected or disconnected to a load. A detector is coupled to the processor and the memory, and accesses the memory using the signal information of the sampled signals.

Abstract: The present invention discloses a channel estimation method, apparatus, and device and a multichannel microwave communications system. According to the channel estimation method, a first vector group corresponding to a transmit end and a second vector group corresponding to a receive end are first obtained according to a transmit-receive array size; then a subchannel estimation procedure is performed multiple times according to the transmit-receive array size, the first vector group, and the second vector group, to obtain multiple corresponding subchannel estimated coefficients; and finally, a real channel matrix is determined according to the first vector group, the second vector group, and an estimation matrix consisting of the multiple subchannel estimated coefficients.

Abstract: Embodiments of the present invention relate to the communication field and provide an array antenna. The array antenna includes: an antenna body, which is a multi-beam antenna, a single-beam antenna without grating lobes, or a single-beam antenna with grating lobes and transmits or receives a beam set by centering on the antenna body, where the beam set includes at least one beam; a planar reflection board, configured to reflect the beam set transmitted or received by the antenna body; and an adjusting unit, connected to the antenna body and/or the planar reflection board, and configured to adjust a relative position between the planar reflection board and the beam set of the antenna body so that the beam set of the antenna body can be transmitted or received in any direction after being reflected by the planar reflection board.

Abstract: The present invention discloses a channel estimation method, apparatus, and device and a multichannel microwave communications system. According to the channel estimation method, a first vector group corresponding to a transmit end and a second vector group corresponding to a receive end are first obtained according to a transmit-receive array size; then a subchannel estimation procedure is performed multiple times according to the transmit-receive array size, the first vector group, and the second vector group, to obtain multiple corresponding subchannel estimated coefficients; and finally, a real channel matrix is determined according to the first vector group, the second vector group, and an estimation matrix consisting of the multiple subchannel estimated coefficients.

Abstract: A delay estimation method for a multiple input multiple output communications system, includes: calculating, by a receiver, a channel response matrix of a Multiple input multiple output MIMO communications system, where there are n transmit channels and m receive channels in the MIMO communications system, n?2, m?2, and the channel response matrix includes channel responses of n*m sub-channels; calculating, by the receiver, an integer delay, relative to a reference sub-channel, of each of the n*m sub-channels according to the channel response matrix, where the reference sub-channel is any sub-channel in the n*m sub-channels; calculating, by the receiver, fraction delays of the n*m sub-channels according to the channel response matrix; and separating out, by the receiver, delays of the m receive channels according to delays of the n*m sub-channels.

Abstract: The present invention discloses a method for correcting an IQ signal. includes: saving an I signal of a last frame and a Q signal of the last frame that are output by a receiving front end; eliminating a direct-current offset of an I signal of a current frame and a direct-current offset of a Q signal of the current frame according to the I signal of the last frame and the Q signal of the last frame; and geometrically correcting an I signal of the current frame after direct-current offset elimination and a Q signal of the current frame after direct-current offset elimination according to an I signal of the last frame after direct-current offset elimination and a Q signal of the last frame after direct-current offset elimination to obtain a corrected I signal of the current frame and a corrected Q signal of the current frame.

Abstract: The present invention provides an equalization method and an equalizer for received signals in a microwave MIMO system. By performing vertical spatial filtering on and combining internal sub-signals for n received signals, an initial sliced signal corresponding to a received signal currently to be decoded is obtained; (n?1) ICI signals are generated based on (n?1) initial sliced signals corresponding to other (n?1) received signals; after the (n?1) ICI signals are eliminated from the n received signals, vertical spatial filtering is performed and internal sub-signals are combined to obtain a final sliced signal.

Abstract: Embodiments of the present invention relate to the communication field and provide an array antenna. The array antenna includes: an antenna body, which is a multi-beam antenna, a single-beam antenna without grating lobes, or a single-beam antenna with grating lobes and transmits or receives a beam set by centering on the antenna body, where the beam set includes at least one beam; a planar reflection board, configured to reflect the beam set transmitted or received by the antenna body; and an adjusting unit, connected to the antenna body and/or the planar reflection board, and configured to adjust a relative position between the planar reflection board and the beam set of the antenna body so that the beam set of the antenna body can be transmitted or received in any direction after being reflected by the planar reflection board.

Abstract: The present invention provides an equalization method and an equalizer for received signals in a microwave MIMO system. By performing vertical spatial filtering on and combining internal sub-signals for n received signals, an initial sliced signal corresponding to a received signal currently to be decoded is obtained; (n?1) ICI signals are generated based on (n?1) initial sliced signals corresponding to other (n?1) received signals; after the (n?1) ICI signals are eliminated from the n received signals, vertical spatial filtering is performed and internal sub-signals are combined to obtain a final sliced signal.

Abstract: The present disclosure relates to the field of network communication, and specifically discloses an adaptive equalization method, including: obtaining a first filtered signal according to a first filter coefficient; deciding the first filtered signal based on an original constellation map to obtain a first decision signal, and deciding the first filtered signal based on a level (n?1) constellation map to obtain a level (n?1) pseudo decision signal; if average energy of the level (n?1) error signal is less than a level (n?1) threshold, switching the level (n?1) constellation map to a level n constellation map; obtaining a second filter coefficient according to the update magnitude; obtaining a second filtered signal according to the second filter coefficient; and deciding the second filtered signal based on the original constellation map to obtain a second decision signal. Embodiments of the present disclosure also disclose an adaptive equalizer.

Abstract: The present invention discloses a method for correcting an IQ signal. includes: saving an I signal of a last frame and a Q signal of the last frame that are output by a receiving front end; eliminating a direct-current offset of an I signal of a current frame and a direct-current offset of a Q signal of the current frame according to the I signal of the last frame and the Q signal of the last frame; and geometrically correcting an I signal of the current frame after direct-current offset elimination and a Q signal of the current frame after direct-current offset elimination according to an I signal of the last frame after direct-current offset elimination and a Q signal of the last frame after direct-current offset elimination to obtain a corrected I signal of the current frame and a corrected Q signal of the current frame.

Abstract: A method and an apparatus for correcting a frequency offset are provided. The method includes: receiving n channels of first signals; performing frequency offset correction processing on the n channels of first signals to obtain n channels of first corrected signals; acquiring n center tap coefficients of a space time equalizer, n first output phases of a phase-locked loop phase detector, and a second output phase of a phase-locked loop phase detector; acquiring n first estimated frequency offset values according to the n center tap coefficients and the n first output phases; acquiring a second estimated frequency offset value according to the second output phase; and receiving n channels of second signals, and performing frequency offset correction on the n channels of second signals according to the n first estimated frequency offset values and the second estimated frequency offset value.

Abstract: Embodiments of the present disclosure provide a method and an apparatus for correcting a frequency offset. The method includes: receiving n channels of first signals; performing frequency offset correction processing on the n channels of first signals to obtain n channels of first corrected signals; acquiring n center tap coefficients of a space time equalizer, n first output phases of a phase-locked loop phase detector, and a second output phase of a phase-locked loop phase detector; acquiring n first estimated frequency offset values according to the n center tap coefficients and the n first output phases; acquiring a second estimated frequency offset value according to the second output phase; and receiving n channels of second signals, and performing frequency offset correction on the n channels of second signals according to the n first estimated frequency offset values and the second estimated frequency offset value.

Abstract: The present disclosure relates to the field of network communication, and specifically discloses an adaptive equalization method, including: obtaining a first filtered signal according to a first filter coefficient; deciding the first filtered signal based on an original constellation map to obtain a first decision signal, and deciding the first filtered signal based on a level (n?1) constellation map to obtain a level (n?1) pseudo decision signal; if average energy of the level (n?1) error signal is less than a level (n?1) threshold, switching the level (n?1) constellation map to a level n constellation map; obtaining a second filter coefficient according to the update magnitude; obtaining a second filtered signal according to the second filter coefficient; and deciding the second filtered signal based on the original constellation map to obtain a second decision signal. Embodiments of the present disclosure also disclose an adaptive equalizer.