Patent ID: 8687729
Filing Date: 2014-04-01
Classification: H04B

Abstract:
1. A radio device comprising: a plurality of antennas transmitting and receiving a signal to and from another radio device; a reception band filter which controls a pass frequency band; a measuring circuit which measures a reception level of the signal received by each of the plurality of antennas in a preamble in the signal received through the reception band filter; an antenna switch which switches the plurality of antennas based on a measurement result from the measuring circuit; and a processor which controls transmission and reception of the signal of the radio device and the pass frequency band of the reception band filter, and which transmits, based on a packet density, an instruction for changing the preamble from a first data length to a second data length to the other radio device and for changing the pass frequency band of the reception band filter from a first band to a second band, wherein if the packet density is determined to be higher than a prescribed threshold, the processor transmits the instruction, to the other radio device, for changing the preamble from the first data length to the second data length, which is relatively shorter than the first data length, and for changing the pass frequency band of the reception band filter from the first band to the second band, which is relatively wider than the first band.