共查询到20条相似文献，搜索用时 171 毫秒
1.
ＡＮＥＷＳＣＨＥＭＥＦＯＲＴＨＥＣＯＤＥＤＳＳＭＡＳＹＳＴＥＭＺｈａｎｇＱｉｎｇ（张清）ＢｉＧｕａｎｇｇｕｏ（毕光国）（ＤｅｐａｒｔｍｅｎｔｏｆＲａｄｉｏＥｎｇｉｎｅｅｒｉｎｇ）ＡＮＥＷＳＣＨＥＭＥＦＯＲＴＨＥＣＯＤＥＤＳＳＭＡＳＹＳＴＥＭ￥Ｚｈａｎ... 相似文献
2.
ＡＮＡＬＹＳＩＳＯＦＴＨＥＦＩＥＬＤＳＳＣＡＴＴＥＲＥＤＦＲＯＭＡＴＷＯ－ＤＩＭＥＮＳＩＯＮＡＬＣＹＬＩＮＤＥＲＩＬＬＵＭＩＮＡＴＥＤＢＹＡＰＯＩＮＴＳＯＵＲＣＥＣｈｅｎｇＣｈｏｎｇｈｕ（程崇虎）ＺｈａｎｇＷｅｎｘｕｎ（章文勋）（ＳｔａｔｅＫｅｙＬａ... 相似文献
3.
4.
ＢＡＹＥＳＩＡＮＭＥＴＨＯＤＯＦＭＡＣＲＯＥＣＯＮＯＭＩＣＡＬＤＥＣＩＳＩＯＮＣｈｅｎＰｉｎｇ（陈平）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ）ＢＡＹＥＳＩＡＮＭＥＴＨＯＤＯＦＭＡＣＲＯＥＣＯＮＯＭＩＣＡＬＤＥＣＩＳＩ... 相似文献
5.
ＰＥＲＦＯＲＭＡＮＣＥＩＭＰＲＯＶＥＭＥＮＴＳＯＦＨＤＳＬＴＲＡＮＳＭＩＳＳＩＯＮＳＹＳＴＥＭＢＹＵＳＩＮＧＭ－ＤＥＴＥＣＴＯＲＷＩＴＨＮＯＩＳＥＰＲＥＤＩＣＴＩＯＮＴＥＣＨＮＩＱＵＥＺｈａｏＣｈｕｎｍｉｎｇ（赵春明）ＣｈｅｎｇＳｈｉｘｉｎ（程时昕）... 相似文献
6.
7.
8.
9.
“ＳＰＥＣＩＦＩＣＡＴＩＯＮＰＬＵＳＴＲＡＮＳＦＯＲＭＡＴＩＯＮＴＯＰＲＯＧＲＡＭ”：ＡＮＥＷＭＯＤＥＬＯＦＳＯＦＴＷＡＲＥＤＥＶＥＬＯＰＭＥＮＴＳｈｅｎＪｕｎ（沈军）ＣｈｅｎｇＺｈｅｎｇｃｈａｏ（程正潮）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳ... 相似文献
10.
ＩＮＦＬＵＥＮＣＥＭＥＡＳＵＲＥＯＦＰＥＲＴＵＲＢＡＴＩＯＮＡＮＤＶＡＲＩＡＢＬＥＳＩＮＲＥＧＲＥＳＳＩＯＮＭＯＤＥＬＳＨｕＹｕｅｑｉｒｉｇ（胡跃清）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ）ＩＮＦＬＵＥＮＣＥＭＥＡＳ... 相似文献
11.
本文在衰落信道下将级联网格编码调制（ＴＣＭ）和连续相位调制（ＣＰＭ）应用于直接序列扩频多址（ＤＳ／ＳＳＭＡ）系统中．作者分别采用了理论分析和数值模拟两种方法研究了级联ＴＣＭ／ＣＰＭＤＳ／ＳＳＭＡ系统的性能，结果表明在相同的条件下采用级联ＴＣＭ／ＣＰＭ编码调制方式的ＤＳ／ＳＳＭＡ系统的错误概率远小于采用单一ＴＣＭ或ＣＰＭ的ＤＳ／ＳＳＭＡ系统的错误概率． 相似文献
12.
13.
14.
黄凌霄 《洛阳师范学院学报》2014,(8):27-29,44
扩频系统接收机的好坏直接决定了整个通信系统的性能.在直接序列扩频通信系统的基础上,提出了一种位同步方法,结合科斯塔斯(Costas)环的载波同步方法和数字匹配滤波器的扩频码同步方法,建立了直接序列扩频通信系统模型.最后,采用MATLAB R2006b/SIMULINK工具,对该系统进行整体仿真.本系统经过仿真,验证其正确性,为以扩频通信为基础的现代通信的研究和设计提供参考. 相似文献
15.
分析了直接序列扩频通信系统的工作原理,选用Gold序列作为扩频序列码,利用MATLAB/Simulink对直接扩频通信系统进行仿真,通过仿真实验,实时跟踪了扩频通信的完整过程。分析实验结果可知,基于Gold序列的直接扩频通信系统抗干扰性较好,电路实现简单,能实现用户通信传输的需要,并且可靠性较好。 相似文献
16.
抑制扩频系统中窄带干扰的新卡尔曼滤波算法 总被引：1，自引：0，他引：1
A new Kalman filtering algorithm based on estimation of spread spectrum signal before suppression of narrowband interference （NBI） in spread spectrum systems, using the dependence of autoregressive （AR） interference, is presented compared with performance of the ACM nonlinear filtering algorithm, simulation results show that the proposed algorithm has preferable performance, there is about 5 dB SNR improvement in average. 相似文献
17.
肖红 《广东广播电视大学学报》2007,16(4):34-37
多核处理器通常由多个同构或异构的处理核和内存单元通过片上网络连接而成,目前越来越多的应用系统采用多核处理器来提高性能和灵活性,多核系统的开发有一些不同于传统处理器特点.本文讨论了基于多核处理器的系统中的编程模式,以及操作系统的策略、核间通信和异构存储管理等问题. 相似文献
18.
Keith E. Miller Craig Hill Antoinette R. Miller 《Decision Sciences Journal of Innovative Education》2019,17(4):302-323
The article describes a multi‐phase, in‐class simulation that employs problem‐based learning to teach operations and process‐improvement concepts as part of an undergraduate or graduate business course. The simulation is derived from a corporate Lean Six Sigma training activity and has been modified to introduce, demonstrate, and apply a wide range of business concepts relevant to operations and supply chain management, including the use of operational and financial performance measures in decision making. The activity is scalable for small‐ to medium‐size classes with multiple student groups and may be deployed as a stand‐alone, in‐class exercise spread over several class meetings or incorporated into a larger, semester‐long process‐improvement project for multiple student groups. The simulation emphasizes problem‐solving, teamwork, and intra‐firm cooperation in addition to 20–30 other business concepts, tools, and measures that may be incorporated. 相似文献
19.
史创明 《安阳师范学院学报》2004,(5):56-60
802.11标准直扩技术主要是对网络的物理层(PH)和媒质访问控制层(MAC)进行了规定,其中对MAC层的规定是重点.同一物理层上可以互操作,逻辑链路控制层(LLC)是一致的,即MAC层以下对网络应用是透明的.这样就使得无线网的"(同网段内)多点接入"和"多网段互连",易于质优价廉地实现. 相似文献
20.
Conventional OFDM transmission system uses a fixed-length Cyclic Prefix to counteract Inter-Symbol Interferences(ISI)caused by channel delay spreading under wireless mobile environment. This may cause considerable performance deterioration when the CP length is less than the channel RMS delay spread,or may decrease the system power and spectrum efficiency when it is much larger. A novel Orthogonal Frequency Division Multiplexing(OFDM)transmission scheme is proposed in this paper to adapt the CP length to the variation of channel delay spread. AOFDM-VCPL utilizes the preamble or pilot sub-carriers of each OFDM packet to estimate the channel RMS delay spread; and then uses a criterion to calculate the CP length,which finally affects the OFDM transmitter. As illustrated in the simulation section,by deploying this scheme in a typical wireless environment,the system can transmit at data rate 11.5 Mb/s higher than conventional non-adaptive system while gaining a 0.65 dB power saving at the same BER performance. 相似文献