A System View on Iterative MIMO Detection: Dynamic Sphere Detection versus Fixed Effort List Detection

Table 6

Difference in implementation cost between an open-loop and a closed-loop system. Area and energy efficiency drop by more than a factor of 2 for the iterative system.

	Open-loop system, 0 iterations		Closed-loop system, 1 iteration
Employed MIMO detector	Sphere detector	Fixed effort detector	Sphere detector	Fixed effort detector
System throughput	300 Mbit/s	300 Mbit/s	75 Mbit/s	75 Mbit/s
Total system area	2.5 mm^2	2.3 mm^2	2.8 mm^2	3.6 mm^2
Total system power	180 mW	520 mW	195 mW	365 mW
System area efficiency	120 (Mbit/s)/mm^2	130 (Mbit/s)/mm^2	27 (Mbit/s)/mm^2	21 (Mbit/s)/mm^2
System energy efficiency	1.7 bit/nJ	0.6 bit/nJ	0.4 bit/nJ	0.2 bit/nJ