| 摘要 |
<P>PROBLEM TO BE SOLVED: To positively make effective use of frequency in a general cognitive radio system. <P>SOLUTION: In the general cognitive radio system where interference management by a primary system is not performed but a secondary system autonomously communicates to provide a frequency common system, a charge domain variable filter circuit is positively used for a transmission/reception route. By performing DSA (Dynamic Spectrum Access) control positively, filtering operation of little unevenness becomes possible, and mutual interference between the primary system and the secondary system is avoided precisely inexpensively with low power consumption. <P>COPYRIGHT: (C)2010,JPO&INPIT |
