Question

can someone help me do this and maybe also the picture of the scope explain how you get it. thankyou!

Frequency-shift keying (FSK) and Phase-shift keying (PSK) Two other modulation schemes are the phase-shift keying (PSK) and the frequency-shift keying (FSK). These are illustrated in Figure 8 b and c respectively. In phase-shift keying the carrier signal changes phase by a radians when the digital signal changes values. In frequency-shift keying a 0 is transmitted at a different carrier frequency than the 1 Figure 8. (a) The modulating signal (t), (b) PSK: the modulated signal m(t)cos( (c) FSK: the modulated signal FSK is commonly used in Caller ID and remote metering application. The wireless LAN standard, IEEE 802.11b-1999 uses a variety of different PSKs depending on the data-rate required. Because of its simplicity PSK is appropriate for low- cost passive transmitters, and is used in RFID standards, which has been adopted for biometric passports, and credit cards. The AWG has built-in generators for FSK modulation. Use the AWG manual (from the ECE website) and generate a FSK signal with the following characteristics: Carrier frequency 10 KHz Hop frequency 1 KHz FSK shift rate 100 Hz Record the sampling frequency you are using: How do you know that the sampling frequency is high enough to avoid aliasing? Display the FFT of the FSK signal. Use a Hanning window good frequency resolution. Capture the FSK signal and its F for your notes. What do you expect the FFT to be? Explain reason you think the FFT vou obtained is correct. Appendix B Figure B2. A PSK signal and its spectrum Figure B3 shows a FSK (Frequency Shift Keying) signal and its spectrum. The frequency of the signal switches between 2KHz and 1KHz at a rate of 100Hz. The spectrum shows the components at 1KHz and 2KHz as well as the spectrum ofa squarewave centered around those components. 100 50 50 100 0.002 0.004 0.006 0.008 0.0 0.012 0.014 0.016 0.018 0.02 Figure B3. A FSK signal and its spectrum Appendix B Spectra of Various Modulated Signals Figure Bl shows how the OOK signal was generated in Matlab A 2 KHz sinusoid is multiplied by a 100 Hz square wave to generate the OOK signal shown in the third plot. The amplitude of the spectrum is shown in the last two plots. Note that the spectrum shows the 2 KHz component and around it you can see the magnitude of the spectrum of the square wave. You can see the odd harmonics of the square wave at 2100Hz, 2300Hz, 2500Hz and so on. fequancy, H Figure B. An OOK signal and its spectrum Figure B2 shows a 2KHz sinusoid that is used together with a 100Hz squarewave to generate a PSK (Phase Shift Keying) signal. The PSK signal is the third plot in the figure. The magnitude of the spectrum is shown in the last 2 plots. You can see the magnitude of the spectrum of the squarewave centered around 2KHz. 0 0.002 0.004 0.008 0.008 001 0.012 0.014 0016 0.018 0.02

Answer 1

uency Sh Modulalion Techniues ore the diatal nddulation . nothing but essage) sanal Fom foeuency 2 104ic-O on Cs Scanned with CamScanner

Sijlal Sianal FSk f; Fsk Modulation. ateo dance 4,1% message sig a logic-o ← o. Page shiftin Cania signal Let te Sarne data loll ooo! nd ania sand amscan

rcSaje -2 Psk. Signal CS Scanned with CamScanner