A detecting method of the QPSK/DS communication using time domain processes and correlation analysis

Based on the characteristics of the QPSK/DS spread spectrum communication, the paper proposes an efficient detection method for QPSK/DS spread spectrum communication. The method achieves the detection of the communication and the estimation of the system parameter Ts and the spreading sequence by doing time domain processing and correlation analyzing on the received signals. The simulations show that the proposed method is not only feasible and efficient, but also can fit the need of the low signal to noise ratio, which is quite common in the detection of spread-spectrum communication.