4564

OPC Server服务器和驱动源代码，非常实用，支持Modbus RTU，Modbus TCP，IEC61850，CANopen协议等。您需求OPC Server或其他协议源代码，联系 truesoft@163.com(OPC Server source code for Modbus RTU，Modbus TCP，IEC61850，CANopen procotol.)

1. 关于无线信道的多普勒谱，请回答以下问题： (1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请清楚的描述产生混叠的各种原因； (2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理； (3) 请用S-function产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请回答：证明自己用计算机产生的经典谱是正确的可能方法。 (Doppler spectrum of radio channel 1, please answer the following questions (1) In some wireless channel, radio channel Doppler shift will cause the output signal aliasing. Please clearly describe aliasing for various reasons )

说明：  开环/闭环下的MIMO信道的信道容量。未知CSI时的MIMO信道容量。(Channel capacity of MIMO channel in open / closed loop. MIMO channel capacity at unknown CSI.)

csma tutorial for begginers with graphics explantaion

Jake s无线通信信道模型仿真的Matlab源程序,采用SOS仿真方法。程序内容包括:时变信道的幅度的实部和虚部,幅度概率密度函数,自相关函数,功率谱密度。(Simulation of Jake s wireless communication channel model Matlab source code, using SOS simulation method. The program includes: the real and imaginary parts of time-varying channel amplitude, amplitude probability density function, autocorrelation function, power spectral density.)

The "feature" parameter in the isSupported(feature,version)" method is the name of the feature and the version is the version number of the feature to test.

一个用c#实现对研华ADAM4117数据采集的控件，对工控行业需要编程实现ADAM4117数据采集的开发人员有一定参考价值(A c# of Advantech ADAM4117 data acquisition control, the industrial sector need programming realize ADAM4117 data acquisition and developers have a certain reference value)

APDL 培训资料，很好的学习ansys的资料(APDL training materials, information on good learning ansys)

S7-200 PLC 的初步设计及编程技巧，适合初学者使用。(S7-200 PLC preliminary design and programming skills, suitable for beginners to use.)

说明：  fh ieee paper Variable Bit Allocation for FH-CDMA Wireless Communication Systems