使用 FSW 进行 5G NR测试

[{"insert":"在基站、小基站的 5G NR 测试中，FSW 频谱分析仪（160M 以上带宽，K144/K145 选件）得到了广泛应用。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"今天我们就介绍下 FSW 频谱分析仪关于 5G NR 测试项。"},{"attributes":{"align":"justify"},"insert":"\n\n"},{"attributes":{"bold":true},"insert":"频谱分析仪 FSW 使用前的准备"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"1.检查电源和接地线"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"2.开机观察仪器左下角有没有错误提示"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"3.按一下按键 setup "},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"选择 Alignment 选中 Await warm-up "},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"运行 start self Aligment，进行自校准"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/12e66645d2baaa48.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"在 FSW 上，按 mode 按键进入功能测试选择界面，选择5G NR 默认的EVM/Ferq Error测试项。 在信号描述-test model中选择根信号源相同的模板。\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/7bf0ad4b93bc0ae6.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"在EVM中我们可以看到测试的结果是0.4%\n除了解调以外，我们还可以还需要测试信道功率，占用带宽和零扫宽（zero span，即Time Alignment Error) 这两个功能既可以在5G NR功能模板里面测试，也可以在频谱模式下的功能选择项测试\n用SMW200A信号源，发射一个 100M带宽，子载波间隔30K 调制方式为64QAM 时隙配比为8：2的5G NR信号\n频谱分析仪FSW 按meas按键 选择 单载波ACLR 测量功能（频谱模式下， 选择 channel power功能）进入测试项，显示信号带宽 98M 信号功率 -4dBm\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/2de77354f10a7995.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"按meas 按键 选择进入Time Alignment Error （频谱模式下， 选择zero spa功能）\n "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/ab6012e678ec40ef.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"从图上能明显看到 5G NR 帧结构。\n除了上述功能外， 在5G NR解调模板下，还可以测试发射开关功率Transmit ON/OFF power ，多载波邻信道泄露比multi carrier ACLR，累计相邻信道泄露比cumulative aclr，频谱模板Spectrum Emission Mask，多载波频谱模板。\n——作者 君鉴科技/Karl Yuan"},{"attributes":{"align":"right"},"insert":"\n"},{"insert":"\n"}]