A radio channel estimator (100) for estimating a first radio channel h.sub.1 to obtain a first radio channel estimate h.sub.1, the first radio channel h.sub.1 being comprised in a multiple input multiple output (MIMO=Multiple Input Multiple Output) radio channel extending between at least a first transmit antenna Tx.sub.1 and a second transmit antenna Tx.sub.2 and a receive antenna Rx, the first radio channel h.sub.1 extending between the first transmit antenna Tx.sub.1 and the receive antenna Rx. The radio channel estimator (100) comprises a means (110) for receiving a reference symbol transmitted by the second transmit antenna Tx.sub.2 and a means (120) for estimating a second radio channel h.sub.2 based on the reference symbol, the second radio channel h.sub.2 extending between the second transmit antenna Tx.sub.2 and the receive antenna Rx. The radio channel estimator further comprises a means (130) for processing the estimate h.sub.2 of the second radio channel based on a spatial property of the MIMO radio channel to obtain the first radio channel estimate h.sub.1.