| 1. | Research on spectrum spreading technology based on a local radio intranet
无线局域网扩频技术研究及实现 |
| 2. | But airborne radar will face highly complicatied clutter environment . the complexities of clutter back ground mainly embody in large amplitude interference of ground clutter , clutter spectrum spread caused by platform movement effect
但由于机载雷达的应用面临非常复杂的杂波环境,杂波功率很强,载机的平台运动效应使杂波谱展宽。 |
| 3. | Adaptive interference suppression can improve further the anti - interference capacity of spectrum spreading ( ss ) systems , reduce the requirement of system processing gain , and thus is important to military communications system
自适应干扰抑制能进一步提高扩频通信系统的抗干扰能力，降低对处理增益的要求，因而具有重要的军事意义。 |
| 4. | When signals pass high power amplifier , they would be distorted in amplitude and phase , leading to spectrum spread and distortion of in - band signals , both of which would weaken performance of the whole system in turn
在无线通信中,信号在通过高功率放大器时会产生幅度和相位失真,造成频谱扩展以及带内信号畸变,导致整个系统性能的降低。 |
| 5. | This dissertion majored in dicussing the signal source and signal transmitting channel ’ s code and decoding of spectrum spread radio station under the concept of the software wirelss radio . the author ’ s main work and new ideas are listed blow : 1
本文主要讨论的是在软件无线电的构架下讨论和实现跳扩频电台的语音编解码以及信道上的编码和解码的理论和实现。 |
| 6. | The different transmit and receive diversity schemes of wcdma are given out in the fifth chapter , and pay much attention to stbc application in wcdma specially , compared the sequence of spectrum spreading and stbc , give out the conclusion : spectrum spreading firstly is better than later
特别针对空时编码在wcdma中的应用作了重点研究,对扩频和空时编码的先后顺序进行了比较研究,得出了扩频在前要优于扩频在后的结论。 |
| 7. | 1 ) the ground clutter is very strong when radar works in its down - look mode . 2 ) the clutter has the character of space - time coupling and the clutter spectrum spreads due to the movement of platform . 3 ) the lower repeat frequency results in doppler blur and the clutter spectrum spreads in the whole doppler domain
地面动目标检测的最大难点： 1 )雷达下视时地杂波特别强; 2 )由于平台运动，地杂波存在着空时耦合，杂波谱展宽； 3 )为避免距离模糊，采用较低的重复频率，但会存在多普勒模糊，地杂波谱扩散到整个多普勒域。 |
