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This paper investigates the estimation of radio channel parameters fromreceiver data, whereby the transmitter is fully unknown. We use a multipathmodel to describe the radio channel between transmitter and receiver. Accordingto this model, we discuss the accessibility of parameters for estimation. Basedon the Maximum-Likelihood principle, we derive a cost function. A second costfunction is derived from the cross relation between the receiver channels. Toestimate the parameters, we seek for the minimum of these cost functions. Theperformance of the presented cost functions are compared in simulations.

Estimation of Radio Channel Parameters in Case of an Unknown Transmitter