This paper investigates the combination scheme between antenna rotation and transmit power allocation (TPA) of Turbo Code for 2×2 Multi-input Multi-output(MIMO) system with HARQ in CDMA. The antenna rotation gets space diversity gain by changing the transmit antenna at every re-transmission. The TPA improves the performance due to the change of the power ratio between systematic bit and parity bit of Turbo code. Simulation shows that both schemes can improve the throughput performance under low Doppler frequency.
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