| 1. | Chapter 4 makes up a modulate and demodulate system based on direct spread msk
第四章中构建了一个直扩msk调制解调模型。 |
| 2. | By analyzing the spectrum feature and correlation feature of walsh sequence , we find that it has the spectrum feature of ds / fh ( direct spread / frequency hopping ) communication mode
我们分析了walsh函数序列的频谱特性和相关特性，结果表明，该序列具有ds fh (直扩跳频)的频谱特性。 |
| 3. | Combining walsh sequence with direct spread spectrum sequence , we can construct hybrid ds - fh spread - spectrum communication mode . this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference
将walsh函数序列与直接扩频序列相结合构成的ds - fh混合扩频通信方式对于系统抗多址干扰和远近效应具有重要意义。 |
| 4. | At last , this thesis use montecarlo simulation method in the given model of direct spread cdma system to calculate the error rate of system which use the every mentioned pn sequences one by one . the simulation tool is matlab
文中最后采用蒙特卡洛仿真方法对直扩cdma系统模型应用不同伪随机序列进行扩频的情况进行了仿真，并计算出了系统的误码率，所用仿真工具为matlab 。 |
| 5. | This dissertation analyses the design idea and method for the direct spreading sequence msk modulate system with an error control function . it gives the matlab simulate result and the performance analysis through the modeling process
本文阐述和分析了一个带有差错控制的直扩序列msk调制系统的设计原理与方法,详细分析和推导了系统的建模过程并给出基于matlab的仿真结果与性能分析。 |
| 6. | Additionally , since direct spread spectrum sequence ( dsss ) signal has an ultra - low power spectrum density , finding approaches to detect it and estimate its parameters in the non - cooperative communication system is a great challenge for applications
另外, dsss信号由于具有极低的功率谱密度,如何在非协作通信中不知道扩频序列的前提下对其进行检测和估计,是一个具有很强应用背景的课题。 |
| 7. | Telecommunications - electromagnetic compatibility and radio spectrum matters - electromagnetic compatibility standard for radio equipment and services - part 23 : specific conditions for imt - 2000 cdma direct spread base station radio and ancillary equipment
电信.电磁兼容性和射频频谱管理.无线电设备和业务电磁兼容性标准.第23部分: imt - 2000 cdma直接扩谱基地台无线电设备和辅助设备的特定条件 |
| 8. | In this article , we introduce the basic principle of the self - encoded direct spread ( seds ) system , construct the model of the system , and analyze the main performances of the system , such as ber performance , self - interference , mai performance and so on
本文介绍了自编码扩频系统的基本原理,构建了系统模型,并对其主要性能,如误码率性能、自干扰特性、多址能力和抗多径干扰能力等作了分析。 |
| 9. | This thesis is focoused on the pn sequence of direct spread cdma communication system , including it ' s generation and properties analyzing . at first , this thesis expounds linear - shift - register sequence and chaotic sequence , and calculates the value of their main properties
本文的研究的是直接序列扩频的码分多址( codedivisionmultipleaccess ，简称为： cdma )通信系统中的伪随机序列技术，包括它的产生方法和性能分析。 |
| 10. | Utra fdd en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 2 : harmonized en for imt - 2000 , cdma direct spread utra fdd covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1
电磁兼容性和无线电频谱情况. imt - 2000第三代细胞网络用基站中继器和用户设备.第2部分:包括r tte指令3 . 2条款的基本要求的imt - 2000的cdma直接扩展 |
