OFDM系统，子载波数目1024，前缀数目256，循环数目256，加入了高斯白噪声-OFDM system, the number of subcarriers 1024, the number prefix 256, the cycle number of 256, by adding a Gaussian white noise
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002205s ]
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:0.098556s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002598s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004085s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002242s ]
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SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002771s ]
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