Single busy tone CDMA -: A novel multiple access protocol for mobile ad hoc network

A Single busy tone Code division multiple access (SBT-CDMA) protocol for Mobile ad hoc network (MANET) is proposed. The RTS/CTS (request-to-send/clear-to-send) handshake mechanism, busy tone and power control are integrated with CDMA to improve the network performance. The RTS/CTS dialogue is used for the CDMA-code allocation and exchange of the power control information. Based on the difference between the calculation value and measurement value of the received busy tone power, a node can ascertain whether it could initialize a RTS packet transmission. Based on the realtime estimation of the channel gain, the transmission power of a data packet sender can be controlled exactly not only to improve the anti-MAI (multiple access interference) ability of the desired receiver, but also to reduce the interference on the undesired receivers around the sender. Simulation results show that SBT-CDMA can significantly reduce the packet collision and increase the network throughput with lower energy consumption, and the near-far problem is also overcomed.