Ds/ss Code Acquisition with a Joint Detection Based on Locally Optimum Test Statistics

In this paper, using the locally optimum (LO) test statistic, a joint decision rule of two correct cells is derived for nonselective Rayleigh fading channels. Then, we propose a new acquisition scheme based on the joint decision rule. The mean acquisition time performance of the proposed acquisition scheme is analyzed and compared with that of a conventional acquisition scheme in which only one correct cell is used for detection at each step. The numerical results show that the proposed scheme not only has better performance but also is more robust to the residual code phase offset variation than the conventional scheme.