A novel wideband channel sounding system operating at 24 GHz with an RF bandwidth of 1 GHz is presented. The SAGE (spacealternating generalized expectation maximization) algorithm is used for obtaining high-resolution estimates of the parameters characterizing the impinging waves, i.e. the delays, incidence azimuths, incidence elevations and complex amplitudes. The Cramer-Rao lower bound (CRLB) provides a benchmark of the mean-squared error (MSE). Monte-Carlo simulations show that the MSE's of the parameter estimates are close to their corresponding CRLB's. The reliability of the channel sounder is tested in a predefined scenario consisting of a direct and two reflected waves. I. INTRODUCTION The high capacity envisaged for future wireless communication systems, such as wireless local area networks, requires the development of systems that exploit the diversity inherent to the indoor radio channel. This necessitates the elaboration of channel models that reproduce the entire dispersiv..