Edson Donizete de CarvalhoAntonio Aparecido de Andrade2026-03-222026-03-22200910.14209/sbrt.2009.57612https://doi.org/10.14209/sbrt.2009.57612https://andeanlibrary.org/handle/123456789/70529In this work we propose a new 2 2 perfect spacetime codes from HEX constellation. This code has full rate, full diversity, nonvanishing constant minimum determinant and uniform average transmitted energy per antenna.ptComputer sciencearticle