| 摘要 |
PROBLEM TO BE SOLVED: To achieve a SFN (Single FRequency Network) even in the transmission of a narrow band signal in disaster prevention radio communication or the like. SOLUTION: The radio relay apparatus includes a routing elimination device for transmitting a reception signal received by a first antenna 101 from a second antenna 121. In this case, the radio relay apparatus includes a function for converting the spectrum of a signal obtained by superposing an estimating signal to a desired narrow band signal into a reciprocal number and attenuating the desired narrow band signal to accurately estimate routing. COPYRIGHT: (C)2011,JPO&INPIT |
