| 摘要 |
PROBLEM TO BE SOLVED: To dynamically set the guard interval length of an OFDM signal in a time shorter than the conventional methods.SOLUTION: A GI length determination unit 14 of a master M requests transmission of an OFDM signal of a stipulated sequence P obtained by adding a guard interval having initial length to an effective symbol obtained by applying OFDM modulation to stipulated data sequentially regarding a plurality of slaves Sn. A correlator 13 outputs mutual correlation value CPR between the stipulated series P and a received sample series R. The GI length determination unit 14 stores, as a delay time τn, a time interval between a time point when the mutual correlation value CPR exceeds a first threshold value Cth1 and a time point when the mutual correlation value CPR exceeds a second threshold value Cth2 after that. The GI length determination unit 14 determines guard interval length on the basis of the largest value among the delay times τn regarding the respective slaves Sn. |
