Signal sending method and device

#The present disclosure relates to the communications field, and specifically, to a signal sending method and device.

#With development of a wireless communications network, due to openness of a wireless physical layer medium and electromagnetic signal transmission in a broadcast manner, data transmitted in the wireless communications network is more easily stolen by a third party than data transmitted in a wired network. Therefore, how to improve data transmission reliability and security in the wireless communications network is an urgent technical problem that needs to be resolved.

#A conventional manner for ensuring the data transmission security in the wireless communications network may be: Data transmission security at a high layer (for example, a wireless link layer or an application layer) of a wireless communications network system is improved, for example, a cryptology theory—based data encryption method, or various security protocols. However, transmission security at a physical layer becomes a key that restricts security of the entire wireless communications network system, and how to ensure data transmission security at the physical layer becomes an important research topic.

#To describe the technical solutions in the embodiments of the present disclosure more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

#FIG. 1 is a schematic flowchart of a signal sending method according to an embodiment of the present disclosure;

#FIG. 2 is a schematic diagram of an application scenario of an embodiment of the present disclosure;

#To achieve the objective of the present disclosure, embodiments of the present disclosure provide a signal sending method and device. A base station receives an uplink pilot signal sent by authorized user equipment, and determines a direction vector parameter and a first channel fading parameter of a channel according to the uplink pilot signal. The direction vector parameter is used for receiving a secrecy signal by the authorized user equipment, and the channel is used for transmitting the secrecy signal. The base station calculates, according to the direction vector parameter and the first channel fading parameter, a first signal beam former parameter used for transmitting the secrecy signal, determines a transmission area of an artificial noise signal according to the direction vector parameter, and calculates, according to the direction vector parameter, a second signal beamformer parameter used for transmitting the artificial noise signal, and the base station processes a to-be-transmitted signal by using the first signal beamformer parameter and the second signal beamformer parameter, and transmits the processed signal. In this way, in a non-target direction, energy leakage of the secrecy signal transmitted by the base station to the authorized user equipment is relatively small, and the base station transmits an artificial noise signal to unauthorized user equipment in a determined transmission area of the artificial noise signal. Therefore, artificial noise signals are concentrated in an area with a relatively high secrecy signal leakage risk, to reduce interference caused to signal receiving of authorized user equipment in another direction.

#The following further describes the embodiments of the present disclosure in detail with reference to the accompanying drawings of the specification.

#FIG. 1 is a schematic flowchart of a signal sending method according to an embodiment of the present disclosure. The method may be described as follows: