从框图我们将看到如何操作每一块。首先给出了串行比特串行并行转换器。结果并行输出给“我”,“问”和“C”。“我”和“问”频道在阶段和正交位’ C ‘一点一点是控制。输入的数据速率是三分之一的并行输出的比特率。“我”和“问”连接到水平移动装置。任何电路电平位移器的主要功能是单极信号转换为双极性信号。电平位移器电路输出的并行块,RZ NRZ和输出成为双相转换。的输出电平位移器连接到乘数。一个乘数“Q”通道输出直接连接。乘数的90度相位载波添加和转向。从一个乘数我们获得2相移键控信号,另一个乘数我们得到2相移键控信号。我们在加法器获得4相移键控信号的加法器。4给出了相移键控信号的增益电路的输入和“c”是另一个增益电路的输入。“我”和“问”位代表输出信号的相位和“C”代表8 qam信号的振幅。
From the block diagram we will see the how the operation is going on each and every block. Firstly serial bits are given to the serial to parallel converter. The resultant parallel output is given to the ‘I’,’Q’ and ‘C’.’I’ and ‘Q’ channel bits are in phase and quadrature where ‘C’ bit is a control bit. The data rate of the input is one third of the bit rate of the parallel output. The ‘I’ and ‘Q’ bits are connected to the level shifter. The main function of the level shifter in any circuit is to convert the unipolar signal to the bipolar signal. In the level shifter circuit the output of parallel bits which are converted RZ TO NRZ and the output becomes bipolar. The output from the level shifter is connected to the multiplier. For one multiplier the ‘Q’ channel output is directly connected. To the multiplier 90degree phase shift with carrier is added and to given. From one of the multiplier we obtain the 2psk signal and from another multiplier we get 2psk signal. So at the adder we obtain the 4psk signal at the adder. The 4psk signal is given as one of the input to the gain circuit and ‘c’ bit is given as another input to the gain circuit. The ‘I’ and ‘Q’ bits represents the phase of the output signal and the ‘C’ bit represents the amplitude of the 8QAM signal.