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This paper deals with two new rate-one, full-diversity space time block codes for four transmit antennas and one receive antenna. The proposed designs add extra symbol to the rate ¾ OSTBC for four transmit antennas with different strategies to make OSTBC rate-one and ensuring full-diversity. Also in this paper it is shown that the proposed STBCs are fast-decodable with QR decomposition. Simulation results show that proposed STBCs have better performance than other proposed designs. This idea is also proposed in  and  before, but in these works the authors do not consider larger signal constellation or do not optimize the coding gain.