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

Table 5

System perspective constraints for different scenarios for 4×4 antenna, 64-QAM systems. The resulting throughput, area, power, and communications performance are very dynamic. Two different types of scenarios are analyzed: communications centric and throughput centric. The fixed effort list detector consists of one fixed effort detector and two LLR units.

Scenario description	MIMO detector components	Detector throughput	Detector area	Power consumption detector	System throughput
Fixed Effort List Detector—Communication Centric
FER =10^−3 at SNR = 22 dB	1 × Fixed Effort List Det., 0 iterations	110 Mbit/s	0.64 mm^2	180 mW	110 Mbit/s
FER =10^−3 at SNR = 20 dB	1 × Fixed Effort List Det. + list storage, 1 iteration	110 Mbit/s	0.96 mm^2	153 mW	40 Mbit/s
FER =10^−3 at SNR = 18 dB	theoretically with list size 4096, not adequate
FER =10^−3 at SNR = 16 dB	not possible	—	—	—	—
Sphere Detector—Communication Centric
FER =10^−3 at SNR = 22 dB	1 × Sphere Detector, 0 iterations	38 Mbit/s	0.26 mm^2	15 mW	38 Mbit/s
FER =10^−3 at SNR = 20 dB	1 × Sphere Detector, 1 iteration	58 Mbit/s	0.26 mm^2	15 mW	24 Mbit/s
FER =10^−3 at SNR = 18 dB	1 × Sphere Detector, 1 iteration		0.26 mm^2	15 mW
FER =10^−3 at SNR = 16 dB	1 × Sphere Detector, 2 iterations	Achievable but T very low (not adequate)
Fixed Effort List Detector—Throughput Centric
𝑇=300 Mbit/s, 0 iterations	3 × Fixed Effort List Det.	330 Mbit/s	1.92 mm^2	540 mW	300 Mbit/s
𝑇=100 Mbit/s, 0 iterations	1 × Fixed Effort List Det.	110 Mbit/s	0.64 mm^2	180 mW	110 Mbit/s
𝑇=100 Mbit/s, 1 iteration	6 × Fixed Effort List Det. + list storage	660 Mbit/s	4.16 mm^2	918 mW	103 Mbit/s
𝑇=30 Mbit/s, 1 iteration	1 × Fixed Effort List Det. + list storage	110 Mbit/s	0.96 mm^2	153 mW	40 Mbit/s
Sphere Detector—Throughput Centric
𝑇=300 Mbit/s, 0 iterations	8 × Sphere Detector	304 Mbit/s	2.08 mm^2	120 mW	300 Mbit/s
𝑇=100 Mbit/s, 0 iterations	3 × Sphere Detector	114 Mbit/s	0.78 mm^2	45 mW	114 Mbit/s
𝑇=30 Mbit/s, 0 iterations	1 × Sphere Detector	38 Mbit/s	0.26 mm^2	15 mW	38 Mbit/s
𝑇=30 Mbit/s, 1 iteration	2 × Sphere Detector	76 Mbit/s	0.52 mm^2	30 mW	30 Mbit/s