$B!J0zMQ!K(B
2000$BG/(B10$B7n(B09$BF|(B
$BEENO@~%$%s%?!<%M%C%H$,8=
$B!!EE2=@=IJ$NEENO$r6!5k$9$kEE8;%3%s%;%s%H!#2HDm$N$I$NIt20$K$b$"$k$b$N$@!#$3$l$rDL?.%3%s%;%s%H$H$7$FMxMQ$G$-$l$P$I$&$@$m$&!#%W%i%0$r%3%s%;%s%H$K$D$J$0$@$1$G!$%$%s%?!<%M%C%H$K@\B3$G$-$k!#$3$l$r2DG=$K$9$kEENO@~DL?.$,6qBN2=$7$F$-$?!#(B
$B!!$3$l$^$GEENO@~DL?.$H$$$($P!$2HEE8~$1$N@)8fMQDL?.$,0lHLE*$@$C$?!#@)8f%G!<%?$@$1$J$N$G9bB.DL?.$OITMW!#BeI=E*$J$b$N$K!$GrJ*2HEE$r@)8f$9$k$?$a$N5,3J!V%(%3!<%M%C%H!W$,$"$k$,!$%G!<%?EAAwB.EY$O(B9.6k$B%S%C%H(B/$BIC!#%$%s%?!<%M%C%H@\B3$K$ONOITB-$@$C$?!#(B
$B!!EENO@~%$%s%?!<%M%C%H$O6e=#EENO$,4k2h$7$F$$$k$b$N!#6e=#EENO$O!$EE?.Cl$K8w%U%!%$%P$rD%$j=d$i$;$?9bB.%M%C%H$r9=C[$7!$$3$N%M%C%H$r;H$C$F%$%s%?!<%M%C%H@\B3%5!<%S%9$rDs6!$9$k7W2h$r;}$D!#EENO@~DL?.$O!$8w%U%!%$%P$H2HDm$r7k$V>lLL$G;H$&!#(B
$B!!%7%9%F%`9=@.$O$3$&$J$k!#2HDm$KCV$/$N$O%Q%=%3%s$HEE8;%3%s%;%s%H$N4V$K@_CV$9$kEENO@~%b%G%`!#EENO@~%b%G%`$O!$%Q%=%3%s$N%G!<%?$r%"%J%m%0?.9f$KJQ49$7$FEENO@~$KAw$j9~$`!#$3$N%"%J%m%0?.9f$OEE?.ClB&$K@_CV$5$l$k?F6I@_Hw$G
$B!!EENO@~%b%G%`$O;0I)EE5!$,3+H/$7$?!#:NMQ$7$?5;=Q$O(BOFDM$B!J(Borthogonal frequency division multiplexing$B!K!#FCD'$O!$69$$<~GH?tBS0h$G$bBgNL$N%G!<%?$rAw?.$G$-$k$3$H!#7W2hCf$N%G%#%8%?%kCO>eGHJ|Aw$d!$3+H/Cf$N9bB.L5@~(BLAN$B!V(BIEEE 802.11a$B!W$K$b:NMQ$5$l$kM=Dj$N?75;=Q$G$"$k!#(B
$B!!(BOFDM$B$H$$$&5;=Q$O0JA0$+$iCN$i$l$F$$$?$,!$Dc%3%9%H$G
$B!!EENO@~DL?.$G$O%N%$%:$,LdBj$K$J$k!#EENO@~$N@h$K$O$5$^$6$^$JEE5$@=IJ$,$D$J$,$k$,!$$3$NEE5$@=IJ$,%N%$%:8;$H$J$k$+$i$@!#EE5$@=IJ$O%*%s$K$7$?$j%*%U$K$7$?$j$9$k$N$G!$%N%$%:$O0lDj$G$J$$!#$^$?!$EENO@~$,%"%s%F%J$H$J$C$F=&$C$F$7$^$&30It$NEE<'GH$b%N%$%:$H$J$k!#;0I)EE5!$O!$$3$l$i$N%N%$%:$N1F6A$rDc8:2=$9$k5;=Q$b?7$?$K3+H/$7$?!#(B
$B!!6e=#EENO$O!$$3$N(B11$B7n$+$iEENO@~%$%s%?!<%M%C%H$N;n83%5!<%S%9$r;O$a$kM=Dj!#&MQ%5!<%S%9$r;O$a$?$$9M$($@!#(B
$B!!(BADSL$B!$(BCATV$B!$L5@~(BLAN$B!]!]!#2HDm$K9bB.%$%s%?!<%M%C%H4D6-$r;}$A9~$`%"%/%;%92s@~5;=Q$O$$$/$D$b$"$k!#6e=#EENO$N;n83%5!<%S%9$N7k2L$K$h$C$F$O!$EENO@~DL?.$,?7$?$JA*Br;h$H$7$F5^Ib>e$9$k2DG=@-$b$"$k!#!J9b66(B $B7rB@O:!K(B