Patent ID: 7773948
Filing Date: 2010-08-10
Classification: H04B,H04J,H04L

Abstract:
1. A communication device used in a first communication system under a frequency sharing environment where the first communication system and a second communication system establish communications within a same frequency band, comprising: a detector for detecting an interfering signal from the second communication system to the first communication system; and a determiner for determining transfer characteristics of a transmission shaping filter according to a result of the detection, the shaping filter being adaptively modifiable and used for a desired transmission signal of the first communication system, wherein when a separation between a central carrier frequency of the desired transmission signal and an undesired signal is large, a transfer characteristics of the shaping filter is narrowed in the frequency domain or the symbol rate is lowered to narrow the signal band pass, and therefore suppress interference; and when the separation between the central carrier frequency of the desired transmission signal and the undesired signal is small, the transfer characteristics of the shaping filter in the frequency region beyond the Nyquist frequency is made larger to increase spectral redundancy and suppress interference.