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An ad hoc wireless network is limited by the characteristics of multi-hop, so its network efficiency cannot be improved by multi-channel technology. This investigation exploits the code division multiple access (CDMA) technology. Employing this technology, even to a single frame, enables the frame header and the frame payload to be modulated separately using a common spreading code and a special spreading code. Some data fields in the frame header are used to announce the spreading code used in the frame payload. A spreading code database is also maintained in every node to support negotiation by special spreading code to prevent the code collision. The RTS/CTS is modified into ERTS/ECTS, and a negotiation process is proposed to get the special spreading code without collision. The algorithm CSMA/CA is modified into CDCSMA/CA to enhance the performance of the ad hoc network. The proposed procedure can be followed to enable numerous node pairs to transmit at the same time as each other. Therefore, the performance of the ad hoc network is significantly.