Search method and search system for best communication location of multiple mobile relays

Abstract

The invention is applicable to the field of wireless communication, and provides a search method for the best communication location of multiple mobile relays. The method comprises the following steps: (A) mobile relays receive a training sequence sent by a source end in any position of a fixed orbit, and transmit the training sequence to a destination end; (B) the destination end receives independent fading signals from the mobile relays and performs maximal-ratio combining, and then, generates single-bit information according to the combining result in each time slot and feeds the single-bit information back to all the mobile relays through broadcasting; and (C) the mobile relays record the current location information, perform calculation according to the single-bit information and move according to the calculation result, the method returns to step A, and finally, the best relay communication position is determined. According to the search method provided by the invention, an airborne single antenna is used, there is neither need to rely on GPS nor need to know the location information of a ground communication unit, and the mobile relays can find the best relay communication location within a given movement trajectory range only by use of the bit information fed-back by the destination end.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a search method and a search system for optimal communication positions of multiple mobile relays based on variable step size disturbance. Background technique [0002] Cooperative communication is a rapidly developing technology with great potential. Cooperative communication uses relay and forwarding data to improve the quality of received signals. The performance of the wireless communication system is mainly restricted by the wireless channel. In the real environment, the propagation path between the transmitter and the receiver is very complicated, and the transmitted signal often passes through various fading and multipath propagation to reach the destination. Diversity technology through Signal samples that have undergone independent fading and carry the same information are combined and processed at the destination end, thereby effectively reduc...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a search method and search system for the optimal position of multi-mobile relays based on variable step size perturbation, aiming to solve the problem of the optimal communication position of the existing UAV relay. The search algorithm is prone to GPS spoofing or interference, resulting in communication relay failure, prone to estimation errors, and increasing the complexity of UAV communication equipment and algorithm complexity.

Images