Constrained deconvolution approach with intercell interference cancellation for LOS estimation in WCDMA system

In most positioning techniques, two or more non-serving base stations (BS) are involved in the location procedure. The position is usually derived from the estimates of the time of arrival of the line-of-sight (LOS) components from these different BSs. In the downlink transmission, the received signal strength from a remote BS is quite low, especially when the mobile is close to the serving BS, and also it is composed of a sum of multiple propagation paths, which may arrive at sub-chip delay intervals, generating closely spaced multipaths. For accurate location estimates, some measures should be taken to solve the closely spaced paths and diminish the intercell interference. In this paper, we introduce a constrained deconvolution approach aided with an intercell interference estimation scheme to solve the closely spaced paths and to enhance the estimation of the delay of the first arriving path from the desired BS.