sequence modulation meaning in Chinese
顺序调制
Examples
- Firstly , the paper summarize the basic knowledge of spread spectrum communication , point out that the baseband of ds signals are divided into short pn sequence modulation and long pn sequence modulation
首先简要概述了扩频通信的基本知识,指出基带ds信号可分为短pn码调制和长pn码调制。 - In this paper , the principle of spread spectrum communication and direct - sequence modulation is introduced . the design principle and constitution of remote concentrated ammeter reading system based on the technique is proposed and the design of spread spectrum communication unit of power line is shown . it is stressed on the synchronization system of spread spectrum communication chip and the two processes of synchronization , manhunt and tracking , are analyzed
文章介绍了扩频通信原理及直接序列扩频，并且介绍了基于该技术的远程集中抄表系统的设计原理和系统组成，给出了电力线扩频通信单元的设计，着重介绍了低压载波通信芯片中同步系统并分析了同步过程的两个阶段：搜捕阶段和跟踪阶段。 - Thirdly , the power spectrum reprocessing approach and cepstrum approach are used to estimate the period of pn sequence . a new method that a power spectrum reprocessing based on delay and multiply is introduced to estimate the period of long pn sequence modulation signals . the algorithm is deduced and the theory simulation results are given
采用二次功率谱法和倒谱法对pn码周期进行估计研究,针对长pn码调制提出了一种基于延时相乘的二次功率谱法的新方法,给出了算法推导和理论仿真。 - Theory simulation results show that the methods mentioned are feasible to detect and estimate the short pn sequence modulation ds signals whose pn sequence length is 63 to 1023 . the delay and multiply approach can be used to estimate the chip rate of long pn sequence modulation ds signals , and the improved algorithm of it is available in lower input snr . the performance of the
延时相乘法对长pn码调制信号pn码速率估计也适用,其改进法的信噪比容限比改进前降低;二次功率谱法和倒谱法对短pn码调制有很好的检测和估计性能,但对长pn码调制不适用,而基于延时相乘的二次功率谱法可以很好的估计出长pn码调制信号的pn码周期。 - Although the long pn sequence modulation has been used widely in the military communication with the good secrecy performance and restraint of jam between symbols , there is scarcely any research of long pn sequence modulation signals . so it is significant to research the estimation of long pn sequence modulation signals
由于目前尚未有对长pn码调制信号进行检测和参数估计的研究,而长码调制较好的保密性能以及抑制部分符号间干扰的优点,使其在军事通信中有着较好的应用前景,因而此部分工作具有重要的意义。