Bamrungkitjaroen, T., P. Suksompong, and C. Charoenlarpnopparut. “Application of a Pipelining Technique in Concatenated Tomlinson Harashima Precoder for Downlink Multiuser MIMO Systems”. Science & Technology Asia, vol. 17, no. 2, Oct. 2015, pp. 1-12, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41179.