OFDM的一种频分复用方案。把频谱分成两个部分，一部分频谱用同频复用，一部分频谱采用复用因子为3，这就是reuse partitioning,或者叫部分频率复用技术（Fractional Frequency Reuse)。频率复用因子表示一个频率复用簇当中的频点的数量。复用因子越大，表示复用距离越大。代码对FFR进行了仿真，适合初学者。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002632s ]
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:0.116278s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001861s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002061s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002448s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003682s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002070s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003225s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016951s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002842s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 329503 [ RunTime:0.001485s ]
