| 1. | Pn pseudo noise
伪随机噪声 |
| 2. | We propose a new method of calculating the best threshold according to the characteristic of pn ( pseudo noise ) code
根据伪随机码的特性,提出了一种新的求取最佳检测门限的方法。 |
| 3. | Secondly , we prove the self - relation function and correlation function of pseudo noise code sequence and obtain the shift register generating circuit from it ' s generating function
然后，通过伪码的生成多项式，导出伪码的移位寄存器生成电路，并分析了伪码的自相关特性和互相关特性。 |
| 4. | We analyzed the anti - jam and band inside anti - interfere performance of the system , and the low probability intercept ( lpi ) of the traditional direct sequence spread spectrum ( dsss ) modulations in the uav platform ' s applications . so a new modulation technique using a multi - level pseudo noise ( pn ) code has been presented . the new multi - level pn code is built from a high speed pn code through a low passed filter ( lpf )
分析了系统抗阻塞式干扰和抗带内频带干扰的性能，以及常规bpsk qpsk - dsss调制在无人机通信中存在的安全隐患，提出了一种用多电平pn码进行扩频调制的方法：采用高速pn码，经过低通滤波器，产生多电平pn码进行直序扩频调制，能在低信噪比情况下有效抵抗平方率检测器对系统载波的检测。 |
| 5. | With the development of the electron and information technology , the blind de - spread of spread spectrum signals in non - cooperation communication has been a research hot spot . the blind detection and estimation of the chip rate and period of pseudo noise ( pn ) sequence are the precondition for the realization of blind de - spread
随着电子战和信息战技术的发展,非合作通信条件下扩频信号盲解扩成为扩频通信领域的研究热点,扩频信号pn码速率和码周期的盲检测和盲估计是实现盲解扩的前提。 |
| 6. | After having estimated some signal parameters , it is an important approach to despread the dsss signal and recover the primitive information by estimating the spreading sequences . therefore the research on blind estimation of pn ( pseudo noise ) sequences shows the vital urgency and significance at present
在检测和估计出直扩信号的参数后,要恢复原始信息,估计出扩频序列是重要的途径之一,因而对ds信号扩频pn ( pseudonoise )码的估计研究就具有迫切性和重要意义。 |
| 7. | After observing the correlative of pseudo noise code , we analyse the main cause of multi - access interference , and build the receiving model of multiuser system . in the thesis the optimum multiuser detectors with minimum probability of error and the near - optimum detectors are intrduced , and then pic multiuser detection is improved on
介绍了最佳多用户检测器和次最佳多用户检测器，并对现有一些并行干扰抵消多用户检测器进行了介绍并提出了改进的措施。对采用改进的算法的系统用montecarlo算法进行了误码性能分析。 |
| 8. | The author first analyzed spread spectrum technology that is used extensively in short - range wireless communications , and discussed some pseudo noise codes " application in spread spectrum technology . then it gave wireless transceiver ' s detailed block diagram in the physical layer . the author also introduced main chip ' s operating theory which is used in this system
本系统在无线收发部分采用dsss技术，工作在2 . 4ghzism频段，本文首先介绍了在短距离无线通信中广泛应用的扩频技术，讨论了几种伪随机码在扩频通信中的应用，然后给出了本系统中物理层所用的硬件电路的框图，介绍了所用芯片组的原理。 |
| 9. | The generating programs of m series and band - limited pn ( pseudo noise ) series are designed based on the research of correlative arithmetic . according to the testing principle and parameter characteristic of echo signal , decimation filter and digital correlator group are provided . the function of target detection and speed measurement is also provided in dsp software
在研究相关算法的基础上,开发了m序列和带限pn序列的产生程序;根据回波信号的检测原理及其参数特性,设计了选抽滤波器和数字相关器组,并在dsp软件中实现了目标检测和测速功能。 |
