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In conventional cooperative communication data rate is 1/2 than non‐cooperative protocols. In this paper, we propose a full data rate DF (Decode‐and‐Forward) cooperative transmission scheme. Proposed scheme is based on time division multiplexing (TDM) channel access. When DF protocol has full data rate, it can not obtain diversity gain under the pairwise error probability (PEP) view point. If it increases time slot to obtain diversity gain, then data rate is reduced. The proposed algorithm uses orthogonal frequency and constellation rotation to obtain both full data rate and diversity order 2. Moreover, performance is analyzed according to distance and optimized components that affect the system performance by using computer simulation. The simulation results revealed that the cooperation can save the network power up to 7dB over direct transmission and 5dB over multi-hop transmission at BER of 10 -2 . Besides, it can improve date rate of system compared with the conventional DF protocol.Key Words:Cooperative Transmission, Constellation Rotation, Decode-and-Forward, Power Consumption

System Optimization, Full Data Rate and Transmission Power of Decode-and-Forward Cooperative Communication in WSN