Abstract: A shutdown device, including a first shutdown module, a second shutdown module, and a control module are disclosed. The first shutdown module includes a first switching device for controlling an output power of a first direct-current power supply coupled to a first input port; and the second shutdown module includes a second switching device for controlling an output power of a second direct-current power supply coupled to a second input port, where the control module modulates a power control signal and a first communication signal to generate a first composite control signal, and the first composite control signal controls the first switching device to work in a high-frequency switching state to superimpose a current ripple signal including the first communication signal onto a power bus; and the control module further generates a switching control signal, to control the second switching device.

Abstract: A photovoltaic device search method, a management module, a photovoltaic system, and a storage medium are provided. The method includes: sending a search instruction for a first photovoltaic device to photovoltaic devices; determining a first photovoltaic device and achieving search for the first photovoltaic device in each photovoltaic string based on a first response signal sent by a photovoltaic device that successfully responds to the search instruction for the first photovoltaic device, the first photovoltaic device being configured to determine a second photovoltaic device that is located in the same photovoltaic string as the first photovoltaic device; and sending a search instruction for a second photovoltaic device to the photovoltaic devices based on the first photovoltaic device, so as to implement search for the second photovoltaic device in each photovoltaic string.

Abstract: A shutdown device, including a first shutdown module, a second shutdown module, and a control module are disclosed. The first shutdown module includes a first switching device for controlling an output power of a first direct-current power supply coupled to a first input port; and the second shutdown module includes a second switching device for controlling an output power of a second direct-current power supply coupled to a second input port, where the control module modulates a power control signal and a first communication signal to generate a first composite control signal, and the first composite control signal controls the first switching device to work in a high-frequency switching state to superimpose a current ripple signal including the first communication signal onto a power bus; and the control module further generates a switching control signal, to control the second switching device.

Abstract: The disclosure discloses a method for sharing a frequency spectrum between a GSM system and a LTE system. The method includes: avoiding fixed channels of the LTE system of a current cell when allocating frequency points of the GSM system to the current cell and a neighbor cell interfering with the current cell; frequency domain resources allocated to users and indicated by Physical Downlink Share Channels (PDSCHs) and Physical Uplink Share Channels (PUSCHs) of the LTE system are not located on same frequency resources with frequency points of the GSM system of the current cell and the neighbor cell interfering with the current cell.

Abstract: A method and system for testing the wireless signal propagation model of the cellular network is provided in the invention. The method comprising: selecting a testing site to install a receiving testing apparatus; moving a transmission apparatus along a testing route transmitting a testing signal upon moving; the receiving testing apparatus receiving the testing signal, and detecting the strength of the received testing signal; and obtaining field strength testing data along the testing route based on a synchronization established between the transmission apparatus and the receiving testing apparatus. By this invention, the testing efficiency of the wireless signal propagation model correction in the area covered by the cellular network can be improved.

Abstract: The disclosure discloses a method for sharing a frequency spectrum between a GSM system and a LTE system.

Abstract: The present invention relates to a device for realizing beam-forming in CDMA mobile telecommunication system by employing smart antenna technique and method thereof, which forms multiple fixed beams in a sector, and uses multiple fixed beams to form the traffic channel with narrow beams and the common channel with sector beams simultaneously in the same smart antenna system, and overcomes the problem of inconsistency of phrases of respective channels due to the variations of time and temperature without complicated correction technique, thereby improving the capacity and performance of CDMA system with multiple antennas.

Abstract: The present invention relates to a method for assigning frequency spectrum bandwidth of an OFDM and OFDMA coexistence system, and the base station system combines uplink and downlink data containing OFDM sub-frames and OFDMA sub-frames in a time division fashion, assigns the frequency spectrum reasonably according to the different bandwidth requirements of the OFDM and the OFDMA and the use condition of the frequency band, and constitutes a frame structure realizing the coexistence of the OFDM and the OFDMA, so as to send the OFDMA uplink/downlink data and the OFDM uplink/downlink data. The method for assigning frequency spectrum bandwidth according to the present invention can achieve a higher frequency spectrum utilization efficiency of an OFDM and OFDMA coexistence system, avoid the waste of the frequency spectrum resource of a service provider; and can also realize more flexible networking.

Abstract: A method and system for testing the wireless signal propagation model of the cellular network is provided in the invention. The method comprising: selecting a testing site to install a receiving testing apparatus; moving a transmission apparatus along a testing route transmitting a testing signal upon moving; the receiving testing apparatus receiving the testing signal, and detecting the strength of the received testing signal; and obtaining field strength testing data along the testing route based on a synchronization established between the transmission apparatus and the receiving testing apparatus. By this invention, the testing efficiency of the wireless signal propagation model correction in the area covered by the cellular network can be improved.

Abstract: Methods and systems for implementing frequency reuse techniques in wireless communication systems such as OFDM systems.

Abstract: The present invention relates to a method for assigning frequency spectrum bandwidth of an OFDM and OFDMA coexistence system, and the base station system combines uplink and downlink data containing OFDM sub-frames and OFDMA sub-frames in a time division fashion, assigns the frequency spectrum reasonably according to the different bandwidth requirements of the OFDM and the OFDMA and the use condition of the frequency band, and constitutes a frame structure realizing the coexistence of the OFDM and the OFDMA, so as to send the OFDMA uplink/downlink data and the OFDM uplink/downlink data. The method for assigning frequency spectrum bandwidth according to the present invention can achieve a higher frequency spectrum utilization efficiency of an OFDM and OFDMA coexistence system, avoid the waste of the frequency spectrum resource of a service provider; and can also realize more flexible networking.

Abstract: The present invention relates to a device for realizing beam-forming in CDMA mobile telecommunication system by employing smart antenna technique and method thereof, which forms multiple fixed beams in a sector, and uses multiple fixed beams to form the traffic channel with narrow beams and the common channel with sector beams simultaneously in the same smart antenna system, and overcomes the problem of inconsistency of phrases of respective channels due to the variations of time and temperature without complicated correction technique, thereby improving the capacity and performance of CDMA system with multiple antennas.