Optimal Relay Position Search Method and System Based on Accumulated Positive Feedback and Variable Step Size

Abstract

The invention is suitable for the technical field of wireless communication and provides a searching method of an optimum communication position of a single moving relay. The method comprises the steps that: the moving relay initializes position information thereof and records initial position information at any initial position on a fixed track, then receives a training sequence from a source end, carries out amplification and forwards the training sequence to a target end; B, according to the received amplified training sequence, the target end calculates communication performance of the received signal and feeds single-bit information back to the moving relay according to the calculation result; C, according to the fed single-bit information, the moving relay calculates the position at the next moment, moves to the position at the next moment and returns to the step A until an optimum relay position is finally determined. By adopting the searching method and system, the relay communication performance is improved, the position information of the source end and the target end are not needed, a plurality of antennas are not needed, the moving relay can find the optimum relay position in a given moving lotus range only by utilizing the single-bit information fed back by the target end.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a search method and system for optimal relay position based on accumulative positive feedback variable step size. Background technique [0002] The communication relay is used to forward the information sent between different nodes, which expands the communication range and improves the performance of the communication system. Land radio communications are easily blocked and shielded by obstacles, and aircraft, satellites, and UAVs (Unmanned Aerial Vehicles, UAVs) can act as communication relays, because airborne relays can effectively communicate with each other in rugged mountainous areas or urban areas The two parties establish a connection. In recent years, the use of unmanned aerial vehicle as a communication relay has attracted the attention and research of many scholars, and its application is also very extensive. [0003] The existing algorith...

AI Technical Summary

Problems solved by technology

The existing UAV relay position search algorithms can make the UAV find the best relay position on their own basis, but there are also certain deficiencies and defects in the scope of application of these algorithms, which are mainly reflected in:( 1) Both the source end and the destination end need to have the GPS function to provide their respective location information to the mobile relay, but in many special cases, both parties do not have the GPS function or the GPS device is damaged, such as the GPS device is damaged due to natural disasters, (2 ) Use the airborne multi-antenna to estimate the signal angle of arrival (Direction Of Arrival, DOA) to search for the best relay position, which is prone to estimation errors and increases the complexity and algorithm complexity of the UAV communication equipment

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