The typical solution, is to include the expansion in brackets after the first use.

Simple rule I learned on my Electronic Engineering degree (where we're guilty of many, many acronyms): When you write an acronym/initialism in a paper (or anywhere for others to read reall), assume the reader doesn't know what it stands for and include the expansion in brackets immediately after the first use.

EDIT: As my sibling comment also suggests, writing it in full the first time, and using the acronym/initialism in brackets is also acceptable.