1、ECTE 364 Tutorial 1 Exercises1. Assume a data stream is made of the binary sequence 0001100111. Draw the digital signals that result from using the following encoding schemes. Unipolar using positive voltages for 1s NRZ-L NRZ-I RZ Manchester Differential ManchesterAnswer:2. What is the data stream d
2、oes the following digital signal represent assuming Manchester encoding, assuming negative-to-positive transitions represent 1?Answer : 111011103. Repeat question 2 assuming differential Manchester encoding, where transitions mean 0s.Answer: 100110014. Illustrate ASK encoding for the sequence 1011 u
3、sing a sine wave and two amplitudes where 10 volts represents 1s and 5 volts represents 0s and using 3 cycles per bit interval.Answer5. Illustrate FSK encoding for the sequence 1011 using a sine wave and two frequencies where 0s are represented by a frequency that is approximately twice the frequenc
4、y used to represent 1s. Assume also that 1s are represented by 3 cycles per bit interval.Time6. Illustrate PSK encoding for the sequence 1011 using a sine wave and phases where a phase of 0 degrees represents 1s and a phase of 180 degrees represents 0s and using 3 cycles per bit interval.7. Show how
5、 Phase Shift Keying (PSK) can be used to encode 2 bits per symbol.Answer:Signal Bits(2+45)11(2+135) 10(2+225)00(2+315) 01Note, the magnitude of each arrow or vector is equal to A. It is possible to use other phase angles, e.g., 90 degree.8. Show how PSK and ASK can be combined to encode 3 bits per symbol. Phase reference signal00 0110 11
