与上一个上传源码属同一问题的不同方面，均为用matlab来实现am调制与解调，以及仿真实现。
-From the previous source is the same issue on different aspects, all using matlab to achieve am modulation and demodulation, as well as simulation.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002422s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.092070s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000943s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001177s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000988s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003196s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000831s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003603s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014355s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001270s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 32874 [ RunTime:0.016475s ]
