| 1. | Ppm : pulse - position modulation
讨论了基于脉冲位置调制 |
| 2. | Pulse position modulation ppm
脉位调制 |
| 3. | Pulse position modulation
脉冲位置灯 |
| 4. | Moreover , theory of the random pulse position modulation and random binary phase - coded ( rppm & rbpc ) pulse doppler is also discussed
在此基础上，进一步讨论了随机脉位调制加随机二相码调相脉冲多普勒雷达原理。 |
| 5. | By introducing oppm ( overlap pulse position modulation ) , the system ' s performances are improved also . 5 study wireless optical cdma system
通过引入oppm (重叠脉冲脉位调制)方式，进一步提高了系统的传输效率。 |
| 6. | This system realize the chaos arithmetic directly by hardware and non - chaos synchronization communication by chaotic pulse position modulation technology
该系统直接用硬件实现混沌迭代算法，运用混沌脉冲位置调制技术实现无混沌同步通信。 |
| 7. | Random pulse position modulation ( rppm ) signal not only has good resolution of distance and velocity , but also has low probability of interception and strong properties of eccm
随机脉位调制信号不仅具有良好的距离和速度分辨力，而且具有较低的被截获概率和较高的抗干扰性能。 |
| 8. | Dual randomized modulation technique is more effective than existing simple random modulation schemes , such as random position modulation or random switching frequency modulation , in dispersing the power spectrum
与已经存在的任何一种单随机方案相比，双随机调制技术驱散谐波能量而使之具有更宽的带宽，能更加有效地减少功率变换器系统的离散谱峰值。 |
| 9. | Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance , system capacity and power spectrum density . on the basis of those analyses , we study the pulse shape and the anti - jamming ability of the system . at last , multiple access with pseudochaotic time hopping is introduce
本文首先阐述了uwb脉冲通信系统的基本原理，重点介绍了用伪随机码跳时的ppm (脉冲位置调制)调制，分析了他的多址性能、系统容量和功率谱密度，在此基础上研究了改进性能的发射信号形状和系统抗干扰能力，最后介绍了伪混沌码跳时的多址方式。 |
| 10. | 2 . applying manchester coding theory to meet the end of collision detection and codes judgment effectively . 3 . using pulse position modulation ( ppm ) coding theory that is invented especially for optical communication in the air to ameliorate the system ' s performance by improving the system ' s character of pe . 4 . taking good advantages of the fledged lan communication protocols and technologies to achieve a new method that has a high rate of capability to cost in building a wireless lan
论文研究中主要的创新性工作如下： 1 、提出利用光散射通信技术组建无线局域网，方便地实现了廉价而高速的局域网内微机的光互连； 2 、采用曼彻斯特编码技术解决了光无线通信中代码判决和碰撞检测的技术难题； 3 、针对空气信道的特点，利用ppm编码技术降低信道误码率、改善系统性能； 4 、在光无线局域网中利用现有的成熟有线局域网协议和技术，从而保证了系统的实用性及改善了系统的性价比。 |
