国家自然科学基金(61275077,61571072)
重庆市科委自然基金(2015jcyjA40024)
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Figure 1
Examples of spectrum utilization, (a) without holding times information; (b) with holding times information
Figure 2
(Color online) Spectrum coherence degree calculation. (a) Physical topology; (b) spectrum allocation
Figure 3
Network topologies for verifying algorithms' performance. (a) NSFNET; (b) USNET
Figure 4
(Color online) Comparison of bandwidth blocking rates in different network topologies. (a) NSFNET;protect łinebreak (b) USNET
Figure 5
(Color online) Comparison of bandwidth utilization rates in different network topologies. (a) NSFNET;protect łinebreak (b) USNET
Figure 6
(Color online) Comparison of energy efficiency in different network topologies. (a) NSFNET; (b) USNET
Serve | Request FSs | Route paths |
$R1$ | 2 FSs | L1, L2 |
$R2$ | 2 FSs | L1, L2, L3 |
$R3$ | 1 FSs | L2, L3 |
$R4$ | 2 FSs | L3 |
$R5$ | 1 FSs | L1, L2 |
Modulation format | Modulation level | Transmission rate (Gb/s) | Power consumption (W) |
BPSK | 1 | 12.5 | 112.374 |
QPSK | 2 | 25 | 133.416 |
8QAM | 3 | 37.5 | 154.457 |
16QAM | 4 | 50 | 175.498 |