| 摘要 |
A communication apparatus used in a spectrum sharing environment in which multiple communication systems coexist using the same spectrum band is provided. The apparatus includes a transmission pulse shaper (92) that performs bandwidth limitation on a pulse which is used to send data symbols; a monitoring unit (97) that monitors in-band interference conditions from coexisting systems other than a target system to which the communication apparatus belongs, and availability of unused spectrum on adjacent channels of the target system, a controller (98) that controls a pulse transmission period and a pulse width of the transmission pulse shaper based on the monitoring result; and a transmission unit (93,94,95) that transmits the band-limited signal.
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