Abstract: A parameter estimation method based on an orthogonal frequency division multiplexing (OFDM) signal, includes: determining a first reference matrix related to a first parameter of a target according to a signal subspace matrix of the OFDM signal, wherein the signal subspace matrix includes relevant information of at least one parameter of the target; and determining the first parameter based on a first reference eigenvalue of the first reference matrix.

Abstract: A method, apparatus and computer readable medium for a multi-user orthogonal frequency division multiplexing (OFDM) subcarrier allocation that improves detection performance of the integrated communication radar system. The performance of the integrated communication radar system is improved by: determining a pseudo-random subcarrier allocation manner for multi-user OFDM.

Abstract: A subcarrier determining method is performed by a target device. The method includes: determining a plurality of subcarriers corresponding to each of at least two communication devices at a same time domain location; wherein an interval between two adjacent subcarriers in the plurality of subcarriers is a target interval, and the communication device is at least one of a data receiving device or an echo receiving device.

Abstract: Embodiments of this application relate to the field of communications technologies. The embodiments of this application are applicable to a centralized management and control network. A centralized controller obtains Z service requests, globally determines, based on an identifier of a source service node and an identifier of a destination service node that are corresponding to each of the Z service requests, a quantum key consumption parameter, and topology information of key nodes in the centralized management and control network, globally optimal key relay instructions corresponding to G service requests, and further delivers the key relay instructions corresponding to the G service requests to key nodes corresponding to the key relay instructions, so that the key nodes perform quantum key relay based on the key relay instructions, to generate a shared quantum key between the source key node and the destination key node.

Abstract: This application discloses quantum key distribution methods and devices, and storage media. In an implementation, an ith node generates, based on a determined first quantum key corresponding to the ith node on a target routing path and a determined second quantum key corresponding to the ith node on the target routing path, a third quantum key corresponding to the ith node on the target routing path, and sends the third quantum key corresponding to the ith node on the target routing path to a destination node on the target routing path, or encrypts a received first ciphertext by using the third quantum key corresponding to the ith node on the target routing path, and sends an obtained second ciphertext corresponding to the ith node to an (i+1)th node on the target routing path.

Abstract: This application provide quantum key distribution methods, devices, and storage media. In an implementation, a method comprises: determining, based on a first mapping, a first quantum key of N first quantum keys corresponding to an ith node on a target routing path; determining, based on a second mapping, a second quantum key of N second quantum keys corresponding to the ith node; and generating, by the ith node based on the first quantum key corresponding to the ith node and the second quantum key corresponding to the ith node, a third quantum key corresponding to the ith node on the target routing path.

Abstract: This application provide quantum key distribution methods, devices, and storage media. In an implementation, a method comprises: determining, based on a first mapping, a first quantum key of N first quantum keys corresponding to an ith node on a target routing path; determining, based on a second mapping, a second quantum key of N second quantum keys corresponding to the ith node; and generating, by the ith node based on the first quantum key corresponding to the ith node and the second quantum key corresponding to the ith node, a third quantum key corresponding to the ith node on the target routing path.

Abstract: Embodiments of this application relate to the field of communications technologies. The embodiments of this application are applicable to a centralized management and control network. A centralized controller obtains Z service requests, globally determines, based on an identifier of a source service node and an identifier of a destination service node that are corresponding to each of the Z service requests, a quantum key consumption parameter, and topology information of key nodes in the centralized management and control network, globally optimal key relay instructions corresponding to G service requests, and further delivers the key relay instructions corresponding to the G service requests to key nodes corresponding to the key relay instructions, so that the key nodes perform quantum key relay based on the key relay instructions, to generate a shared quantum key between the source key node and the destination key node.