Controlling Initial and Final Radii to Achieve a Low-Complexity Sphere Decoding Technique in MIMO Channels

Figure 5

𝐶_𝑓, the proper 𝐶₀, and 𝐶_𝑏𝑎 of SE-SD versus the number of antennas for 64QAM. (a) 𝜎²=0.65, (b) 𝜎²=0.203, and (c) 𝜎²=0.05.

(a)

(b)

(c)