A wireless communication device including a transceiver, a medium access control device, a first module and a second module. The transceiver is configured to receive a signal on a channel. The medium access control device is configured to determine a parameter, wherein the parameter is a rank of a matrix of the channel, an angle of array of the signal, a packet error rate of the signal, a frame error rate of the signal, or a signal-to-noise ratio of the signal. The first module is configured to, based on the parameter, determine whether an operating environment of the wireless communication device is a rich-scattering environment or a line of sight environment. The second module is configured to adjust a bandwidth of the wireless communication device based on the operating environment as determined by the first module.