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I think it is because of the complexity. CDMA requires a basestation to coordinate important facts such as power control in every terminal. Oh the other hand ad hoc networks are said to be:
"In conclusion, mobile ad-hoc networks allow the construction of flexible and adaptive networks with no fixed infrastructure. These networks are expected to play an important role in the future wireless generation. Future wireless technology will require highly-adaptive mobile networking technology to effectively manage multi-hop ad-hoc network clusters, which will not only operate autonomously but also will be able to attach at some point to the fixed networks."