| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an information transmission system in which influences of rotor modulation are suppressed when transmitting transmission data from a shooting helicopter through a relaying helicopter to a ground station. <P>SOLUTION: Pilot symbols ps<SB>1</SB>, ..., ps<SB>M</SB>of reception data ra are extracted by PS extraction sections 42<SB>1</SB>, ..., 42<SB>M</SB>in a distortion compensation means (e.g., data radio unit 28). Channel estimation data cp<SB>1</SB>, ..., cp<SB>M</SB>are acquired in channel estimation sections 43<SB>1</SB>, ..., 43<SB>M</SB>. Non-distorted channel estimation data nd and distorted channel estimation data yd are output by a selective combination unit 44. In a fading compensation unit 45, fading compensation is performed using the non-distorted estimation data nd, and reception data fa are acquired. In a rotor distortion estimation unit 46, a distortion component di of rotor modulation is estimated on the basis of the distorted channel estimation data yd. In a rotor modulation compensation unit 47, compensated reception data ma are acquired. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
