Reference no: EM132373840
Lab: Binary Phase-Shift Keying (BPSK) from the Communication Systems
Submit a lab report showing the completing of Lab include pictures where appropriate. This assignment supports the course objectives CO-1 and C0-2.
1. In Transmitter Step 3 you are given 1/T = 10,000 symbols/s and 1/Tx = 200 x 103 Sa/s. Find the corresponding value for the number of samples per symbol L .
2. Eq. (6) in the Background section above shows that the received baseband signal r~[n] includes a factor ejΦ, where Φ is any phase difference that may exist between the transmitter andreceiver carrier oscillators. Explain what would happen if you omitted the phase synchronization step in the receiver. Specifically, what would be the receiver output if Φ just happened to take the value Π/2?
3. In Receiver Step 2 the "actual IQ rate" 1/Tz may be different from the rate 1/Tx that was used at the transmitter. ( Note that the symbol rate 1/T must be the same at the transmitter andreceiver.) The value of the receiver's IQ rate determines the receiver sampling factor M . Whatis the advantage to using a higher value of M ? What is the advantage of using a lower value of M ?
4. Although BPSK is a suppressed-carrier version of ASK, we do not use an envelope detector to demodulate BPSK the way we did for ASK. Why is that? What would the receiver output be if we used an envelope detector for demodulation?
5. Bit error rate is a measure of performance of a digital communication system. What would the bit error rate be if the transmitter failed and the receiver received only noise? Explain your reasoning.
Another below two questions are on page 113 in Lab book.
1. How do the main lobe bandwidth and spectral rolloff rate for root-raised cosine pulses compare with the same quantities when rectangular pulses are used?
2. What does a BER of 1.0 signify? Explain why the BER is 0 half the time and 1.0 half the time.
Lab book: Introduction to Communication System - Lab-Based Learning with NI USRP and Lab VIEW Communications by Bruce A. Black.
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