题目内容
（请给出正确答案）
The block diagram of a causal C-T LTI system is shown below. Then the transfer function
of the system is
A、
B、
C、
D、
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A、ladder diagram
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The block diagram of a causal D-T LTI system is shown below. If the system is stable, what condition should the constant
satisfy？
A、
B、
C、
D、
1.To obtain the transfer function, we need to find the Laplace transform of the equations of motion and solve the resulting algebraic equations for the relationship between the input and the output. In many control systems the system equations can be written so that their components do not interact except by having the input of one part be the output of another part. In these cases, it is easy to draw a block diagram that represents the mathematical relationships in a manner similar to that used for the component block diagram in Fig. 1.2, Chapter 1.
Consider the inverted pendulum shown in Figure E1.13. Sketch the block diagram of a feedback control system. Identify the process, sensor, actuator, and controller. The objective is keep the pendulum in the upright position, that is to keep
Fill in the appropriate functional names for the digital signal processing system block diagram in the figure. （） 为下图所示的数字信号处理系统框图填入适当的功能模块名称：（）。
A、(From left to right) Sample-and-hold circuit; ADC; DAC; Reconstruction filter （从左到右）采样保持电路；模数转换器；数模转换器；重建滤波
B、(From left to right) Sample-and-hold circuit; ADC; Reconstruction filter; DAC （从左到右）采样保持电路；模数转换器；重建滤波；数模转换器
C、(From left to right) ADC; Sample-and-hold circuit; DAC; Reconstruction filter （从左到右）模数转换器；采样保持电路；数模转换器；重建滤波
D、(From left to right) Sample-and-hold circuit; DAC; ADC; Reconstruction filter （从左到右）采样保持电路；数模转换器；模数转换器；重建滤波
Consider a MIMO-OFDM transmiter with
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and
is denoted by
.with each row corresponding to an antenna and each column corresponding to a timeslot . a) Draw the block diagram of the transmitter. b) If the symbols of the two timeslots in the codeword are input to Subcarriers k, and k+1, respectively, write the received signals on the two subcarriers after OFDM demodulation in the receiver. c) Write the expression of the STBC decoder.
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