OSPG-MAC: An OFDMA-Based Subcarrier Pregrouping MAC Protocol for Underwater Acoustic Wireless Sensor Networks

Figure 4

The influence of different values of M on the performance of the network. (a) The influence of M on feedback from neighbors. (b) The influence of M on subcarrier allocation (M = 1, M = 2, M = 4).

(a)

(b)