Sunday, March 3, 2024
问题:什么叫码重?什么叫码距?最小码距的物理意义是什么?...
Thursday, March 7, 2024
Thursday, March 7, 2024
Thursday, March 7, 2024
问题:要成为地球的静止卫星,通信卫星的运行轨道须满足哪些条件?...
Thursday, March 7, 2024
Tuesday, February 27, 2024
Thursday, March 7, 2024
问题:已知二进制数字信号每个码元占用的时间为1ms,1、0等概率出现,求: (1)码元速率 (2)每秒钟的信息量 (3)信息速率...
Tuesday, February 27, 2024
问题:数字基带信号经过()之后变成了()信号,可以在带通信道中传输。...
Thursday, March 7, 2024
Tuesday, February 27, 2024
Tuesday, February 27, 2024
Thursday, March 7, 2024
Sunday, March 3, 2024
Sunday, March 3, 2024
Thursday, March 7, 2024
问题:用于电话网中的双绞线其传输带宽()A、随线径的增加而增加B、随线径的增加而减小C、与线径无关...
Thursday, March 7, 2024
Tuesday, February 27, 2024
Thursday, March 7, 2024
问题:下列通信介质中,传输频率最高的介质是()A、双绞线B、同轴电缆C、地面微波D、光纤...
Sunday, March 3, 2024
Thursday, March 7, 2024