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Hidden nodes in a wireless network refer to nodes which are out of range of other nodes or a collection for nodes. Take a physical

in a circular fashion; each node is within communication range of the Access Point, however, not each node can communicate with each other. For example, it is likely that the node at the far edge of the circle can see the access point, which is known as r, but it is unlikely that the same node can see a node on the opposite end of the circle, 2r (or simply the diameter). These nodes are known as hidden. The problem is when node r and r2 start to send packets simultaneously to the Access Point. Since node r and r2 can not hear each other Carrier sense multiple access with collision detection (CSMA/CD) does not work. Therefore The same problem exists in a MANET.