Downlink NOMA power distribution method for multi-beam LEO satellite communication system

Abstract

The invention discloses a downlink NOMA power distribution method in a multi-beam LEO satellite communication system. The power distribution method comprises the steps: firstly constructing the downlink sum rate of a multi-beam LEO satellite, determining the rate of a kth user in a beam i and whether the jth resource of an ith beam is distributed to the kth user of the beam or not under the constraint conditions, and determining whether the jth resource of the ith beam is distributed to the kth user, wherein the i represents the jth resource of the ith wave beam to be allocated to the kth userof the wave beam and represents the jth resource of the ith wave beam not to be allocated to the kth user of the wave beam, the Pmax represents the total downlink power of the satellite and the powerof the kth user in the wave beam i, and the Rmin represents the minimum receiving rate requirement of the user; solving the maximum power distribution scheme of f (P) through a genetic algorithm; andfinally, configuring power values of all users in the multi-beam LEO satellite communication system according to the obtained power allocation scheme, and meanwhile, accessing the users to corresponding regions and allocating corresponding time-frequency resources. According to the invention, the downlink sum rate and the spectrum utilization rate of the system can be improved, so that the systemobtains the maximum throughput.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a downlink NOMA power allocation method in a multi-beam LEO satellite communication system. Background technique [0002] With the increasing wireless communication services and increasing user access requirements, the multi-beam LEO satellite communication system has received more and more attention from academia and industry due to its advantages of wide coverage, large access, and high spectrum utilization. focus on. Compared with MEO and GEO, the LEO satellite communication system has lower delay and power consumption, and is more widely used. For LEO satellites, how to effectively allocate the limited power on the star to ensure the communication quality has always been a hot topic in the field of satellite communication. [0003] However, when the signal is sent from the satellite to the user, it will experience severe co-channel interference. On the one ...

Images