Abstract: Biometric information is obtained from a user. A determination is made that the obtained biometric information matches at least one entry in a biometric database. In response to determining that the obtained biometric information matches the at least one entry in the biometric database, non-biometric verification information is obtained. A determination is made as to whether at least a portion of the non-biometric verification information matches at least a portion of preset non-biometric verification information associated with the user. In response to determining that the at least a portion of the non-biometric verification information matches, a determination is made that an identity of the user is verified. In response to determining that the at least a portion of the non-biometric verification information does not match, a determination is made that the identity of the user is not verified.

Abstract: Biometric information is obtained from a user. A determination is made that the obtained biometric information matches at least one entry in a biometric database. In response to determining that the obtained biometric information matches the at least one entry in the biometric database, non-biometric verification information is obtained. A determination is made as to whether at least a portion of the non-biometric verification information matches at least a portion of preset non-biometric verification information associated with the user. In response to determining that the at least a portion of the non-biometric verification information matches, a determination is made that an identity of the user is verified. In response to determining that the at least a portion of the non-biometric verification information does not match, a determination is made that the identity of the user is not verified.

Abstract: The present invention provides a channel estimation method for a MIMO (Multiple-Input Multiple-Output) antenna system comprising two transmit antennas and two receive antennas. The method performs a preliminary estimation on a channel, and then calculates to obtain a calculated value for the transmitted signal by using the estimated channel value. The calculated value for the transmitted signal is reconstructed, the reconstructed calculated value is used as the transmitted signal, and the channel value is estimated for a second time. The iteration is performed in this manner for n times, leading to a more accurate channel value. The method of the invention has a high efficiency, and the channel value is accurately estimated.