References:
X. Qin, Z. Yan and G. He, "A Near-Optimal Detection Scheme Based on Joint Steepest Descent and Jacobi Method for Uplink Massive MIMO Systems," in IEEE Communications Letters, vol. 20, no. 2, pp. 276-279, Feb. 2016, doi: 10.1109/LCOMM.2015.2504506.