Performance of code acquisition for DS-CDMA overlay
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abstract
This paper evaluates and compares the performance of two code acquisition schemes for direct-sequence (DS) code-division multiple-access (CDMA). The first techniques is a subspace based estimation technique which uses the well-known MUSIC algorithm. The second method obtains its timing estimation from an adaptive near-far resistant receiver known as the minimum mean-squared error (MMSE) receiver. Both of these techniques have been shown in previous work to be able to obtain reliable code acquisition in a severe near-far environment. In this paper it is shown that both of these techniques are also simultaneously robust to narrowband interference and near-far cochannel interference and thus useful in a CDMA overlay scenario. Simulation results are provided which evaluate the performance of these acquisition schemes as it depend on the bandwidth of the narrow-band interference and the presence or absence of CDMA power control. The interference is modelled as narrow-band Gaussian noise. It is found that the MUSIC estimation strategy provides a consistently better estimate than the MMSE estimator but at the cost of significantly higher complexity.
