A communication device configured to operate in a Multiple-input Multiple-output (MIMO) operation mode and Single-input Single output (SISO) operation mode and operation mode switching method are described. The communication device can include a transceiver associated with a first antenna, and configured to wirelessly communicate via the first antenna using a first communication technology; a second antenna associated with a second communication technology different from the first communication technology; and a controller coupled to the transceiver. The controller can be configured to: determine communication information corresponding to the first and the second communication technologies; and control the communication device to switch an operation mode of the communication device between the MIMO operation mode and the SISO operation mode based on the determined communication information.