A power allocation method for a non-circular signal-based downlink non-orthogonal multiple access system

Abstract

The application discloses a power distribution method of a downlink non-orthogonal multiple access system based on a non-circular signal and belongs to the technical field of wireless communication systems. According to the characteristic that a non-circular signal can change the second-order statistics of a sending signal, the non-circular signal is applied to a two-user downlink non-orthogonal multiple access system, and a joint design scheme of a non-circular coefficient and power of a strong channel user is provided. The method implementation steps comprise the following steps: according to the distance between a user and a base station, determining the average channel noise ratio intensity of each user, and the residual interference intensity of an imperfect serial interference canceller adopted by a strong channel user; specifying the sending signal power of a weak channel user, the maximum sending signal power of the strong channel user, the target rate of each user and the maximum outage probability threshold of the weak channel user; and calculating the optimal signal sending parameter of the strong channel user according to a formula. The scheme is helpful to improve the transmission reliability of the strong channel user on the premise of ensuring the transmission reliability of the weak channel user.

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