A code acquisition scheme for DS/CDMA systems

When the code phase offset between two sequences is within one chip duration, the sum of two successive matched filter outputs has a constant value regardless of the residual code phase offset if the noise is absent. Based on this observation, we propose a new code acquisition scheme, which is robust to the variation of the residual code phase offset and outperforms the conventional scheme. Numerical results are also given to show that the proposed scheme is more robust to the variation of the residual code phase offset and has better performance than the conventional scheme on average