| 1. | Orthogonal frequency division multiplex ( ofdm ) is a new technology that transmits data in at a high speed on wireless channel
正交频分复用( orthogonalfrequencydivisionmultiplex , ofdm )是近几年兴起的一种在无线信道上实现高速数据传输的新技术。 |
| 2. | Uestc is in charge of the tdd downlink that bases on fpga . ofdm ( orthogonal frequency division multiplex ) is the key technology of b3g system
现在已经进入项目的第二个阶段,电子科技大学负责b3gtdd方式的下行链路设计,重点是基于fpga (现场可编程门阵列)的实现研究。 |
| 3. | Methods of measurement for radio equipment used in satellite earth stations - methods of measurement on combinations of sub - systems - measurements for frequency division multiplex f . d . m . transmission
卫星地面站用无线电设备测量方法.第3部分:分系统组合件测量方法.第4节:分频多路传输测量 |
| 4. | Methods of measurement for radio equipment used in satellite earth stations ; part 3 : methods of measurement on combinations of sub - systems ; section 4 : measurements for frequency division multiplex transmission
卫星地面站用无线电设备的测量方法.第3部分:分系统组合件的测量方法.第4节:分频多路传输 |
| 5. | Methods of measurement for radio equipment used in satellite earth stations . part 3 : methods of measurement on combinations of sub - systems . section four : measurements for frequency division multiplex f . d . m . transmission
卫星地面站用无线电设备的测量方法.第3部分:分系统组合件的测量方法.第4节:分频多路传输测量 |
| 6. | Initially , pdh was introduced to improve and replace the obsolete analog frequency division multiplex ( fdm ) system . however , it was soon found that pdh had shortcomings such as difficulty in management , high construction cost , limited applications and lack of connectivity standards at the optical layer . thus , in the early 1990s , synchronous digital hierarchy ( sdh ) was introduced in the transmission system
Pdh最初引入是为了改进和替代老式的模拟频分复用器系统，但很快被发现pdh管理困难、造价高、应用范围窄，且缺乏在光层面上的连接标准，因此90年代初期， sdh （ synchronousdigitalhierarchy ）标准被首先引入了传输系统。 |
