趣话通信：6G的前世、今生和未来-畅读网

　　　　

趣话通信：6G的前世、今生和未来

作者：张林峰

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科学技术 >> 工业技术

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内容简介:

通信行业是当今社会的热门行业，本质上，通信其实是人类活动的极其重要的辅助手段。随着近代各项技术的进步，通信技术的发展也是在一代一代地更新迭代发展壮大。本书从人类发展中最原始的语言开始，描述了通信的作用，概要介绍了通信的基础，特别是无线通信的发展简要历程，到如今的5G技术以及不久到来的6G技术等，后续也畅想了未来的通信和其他技术的发展方向，并把7G、8G之后的时代归结为6G＋时代。期待随着通信等人类可用工具的高度发达，人类的活动领域将扩展，各种生活方式也会随之出现巨大变化。

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SELECT * FROM `ls_friendly_link` WHERE `is_show` = 1 AND `del` = 0 ORDER BY `id` DESC,`sort` DESC [ RunTime:0.002681s ]
SHOW FULL COLUMNS FROM `ls_ad` [ RunTime:0.002575s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 10 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.002626s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 5 LIMIT 1 [ RunTime:0.002287s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 45 LIMIT 1 [ RunTime:0.002239s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.002459s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.002864s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1747440837 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:0.624255s ]

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