Skip to main content
Login Home Wireless Communication Modulation MATLAB Beamforming Project Ideas MIMO Computer Networks

Comparisons among ASK, PSK, and FSK | And the definitions of each


  

Comparisons among ASK, PSK, and FSK





 

Simulator for Calculating Bandwidth of ASK, FSK, and PSK

The baud rate represents the number of symbols transmitted per second. Both baud rate and bit rate are same for binary ASK, FSK, and PSK.











Comparison among ASK, FSK, and PSK

Performance Comparison:

1. Noise Sensitivity:

   - ASK is the most sensitive to noise due to its reliance on amplitude variations.
   - PSK is less sensitive to noise compared to ASK.
   - FSK is relatively more robust against noise, making it suitable for noisy environments.

2. Bandwidth Efficiency:

   - PSK is the most bandwidth-efficient, requiring less bandwidth than FSK for the same data rate.
   - FSK requires wider bandwidth compared to PSK.
   - ASK's bandwidth efficiency lies between FSK and PSK.

3. Complexity:

   - ASK and FSK are relatively simpler to implement and demodulate.
   - Coherent PSK demodulation can be more complex due to carrier synchronization requirements.

4. Fading and Multipath Resilience:

   - FSK performs well in fading and multipath scenarios due to its frequency diversity properties.
   - PSK can be affected by fading, especially in frequency-selective fading conditions.
   - ASK may experience significant performance degradation in fading and multipath channels.

5. Applications:

   - ASK is commonly used in simple applications such as remote controls, RFID, and binary communication.
   - FSK is suitable for applications where noise immunity is important, such as wireless communication and telemetry systems.
   - PSK is widely used in digital communication systems, including modems, Wi-Fi, and digital broadcasting.

The choice of modulation technique depends on the specific requirements of the communication system, including the channel characteristics, noise levels, data rate, and complexity constraints. Each modulation technique has its strengths and weaknesses, and the best choice will depend on balancing these factors for the given scenario. 

Graphical or plot representation of ASK, FSK, and PSK










The above figures show that the carrier frequency for ASK is 10 Hz. For PSK, that is 5 Hz. But for FSK, carrier frequencies are 10 Hz and 2 Hz


Summary

  • ASK is simple to generate, and it has a less complex circuitry in comparison to FSK and PSK
  • As noise is very sensitive to amplitude so it has poor noise immunity.  
  • FSK is less susceptible to errors than ASK
  • FSK is suitable for high-frequency communication as modulation deals with two different high carrier frequencies here. 
  • FSK circuitry is moderately complex
  • The bit rate in FSK is higher than in ASK 
  • In FSK, noise immunity is high
  • PSK circuitry is very complex 
  • PSK has a higher bit rate as compared to FSK
  • PSK has better noise immunity than FSK

Why are ASK, FSK, and PSK used? 


Electronic devices are sensitive to amplitude, frequency, and phase, so these three digital modulation techniques are used during wireless data transfer.

 

Comparison of BER vs SNR among ASK, FSK, and PSK in MATLAB







(Get MATLAB Code)

Fig 2: Comparison of BER vs SNR among ASK, FSK, and PSK



Some Questions and Answers (Q&As)

  1. In a coherent Frequency Shift Keying (FSK) system, what is the primary challenge in achieving coherent detection?
    Answer: Maintaining phase synchronization between transmitter and receiver.
    Explanation: Coherent detection requires maintaining phase synchronization to correctly demodulate the signal. 
  2. Which of the following is a major disadvantage of Amplitude Shift Keying (ASK)?
    Answer: Susceptibility to noise and interference.
    Explanation: ASK is highly susceptible to noise because it relies on amplitude changes.
  3. Which modulation scheme is typically more bandwidth-efficient?
    Answer: Phase Shift Keying (PSK).
    Explanation: PSK is more bandwidth-efficient because it encodes information in phase shifts.
  4. In Phase Shift Keying (PSK), what is the impact of increasing the number of phase states?
    Answer: Higher data rates.
    Explanation: More phase states allow higher data rates as more bits can be encoded per symbol.
  5. Which of the following is a key advantage of using Non-Coherent FSK over Coherent FSK?
    Answer: Simpler receiver design.
    Explanation: Non-Coherent FSK has a simpler receiver design because it does not require phase synchronization.
  6. Why is Phase Shift Keying (PSK) considered more power efficient than Frequency Shift Keying (FSK)?
    Answer: PSK can maintain performance at lower signal-to-noise ratios.
    Explanation: PSK is more power efficient because it can achieve good performance at lower signal-to-noise ratios.
  7. Which characteristic of FSK modulation makes it advantageous for certain applications?
    Answer: Its robustness in high-noise environments.
    Explanation: FSK is robust in noisy environments because the frequency changes are distinct.
  8. What is the primary disadvantage of using higher-order PSK modulation schemes?
    Answer: Increased sensitivity to noise.
    Explanation: Increased sensitivity to noise due to smaller phase differences between symbols.
  9. Which modulation scheme is typically used in radio broadcasting?
    Answer: Frequency Modulation (FM).
    Explanation: FM is commonly used in radio broadcasting due to its robustness to noise.
  10. In a PSK system, what can be used to improve error performance?
    Answer: Using error correction coding.
    Explanation: Error correction coding helps to detect and correct errors, improving performance.

Read Also

  2.  Modulation Indices for Amplitude Modulation, Frequency Modulation, and Phase Modulation
  3. Constellation Diagrams of ASK, FSK, and PSK 
  4.  MATLAB Code for ASK, FSK, and PSK 
  5.  Simulation of ASK, FSK, and PSK using MATLAB Simulink
  6.  Theoretical BER vs SNR for BPSK 
  7.  Comparisons among Amplitude, Frequency and Phase Modulation

 
# difference between ask fsk psk  # ask psk fsk comparison  # compare ask fsk psk  # ask fsk psk difference  # difference between ask psk fsk  # ask vs fsk vs psk  # ask fsk psk modulation  #

People are good at skipping over material they already know!

View Related Topics to







Admin & Author: Salim

s

  Website: www.salimwireless.com
  Interests: Signal Processing, Telecommunication, 5G Technology, Present & Future Wireless Technologies, Digital Signal Processing, Computer Networks, Millimeter Wave Band Channel, Web Development
  Seeking an opportunity in the Teaching or Electronics & Telecommunication domains.
  Possess M.Tech in Electronic Communication Systems.


Contact Us

Name

Email *

Message *

Popular Posts

ASK, FSK, and PSK

๐Ÿ“˜ Overview ๐Ÿ“˜ Amplitude Shift Keying (ASK) ๐Ÿ“˜ Frequency Shift Keying (FSK) ๐Ÿ“˜ Phase Shift Keying (PSK) ๐Ÿ“˜ Which of the modulation techniques—ASK, FSK, or PSK—can achieve higher bit rates? ๐Ÿงฎ MATLAB Codes ๐Ÿ“˜ Simulator for binary ASK, FSK, and PSK Modulation ๐Ÿ“š Further Reading   ASK or OFF ON Keying Ask is a simple (less complex)  Digital Modulation Scheme  where we vary the  modulation  signal's amplitude or voltage by the message signal's amplitude or voltage. We select two levels (two different voltage levels) for transmitting modulated message signals for the exam. And for example, we mapped the signal as two-level  "+5 Volt"  (which is the upper level) and another level,  "0 Volt,"  which is considered as the lower level. Whenever we need to transmit binary bit  "1,"  then the transmitter transmits a signal of  "+5 Volts,"  and when we need to send bit  "0,"  t...
Read more

RMS Delay Spread, Excess Delay Spread and Multi-path ...

๐Ÿ“˜ Overview ๐Ÿงฎ Multipath Components or MPCs ๐Ÿงฎ Excess Delay spread ๐Ÿงฎ Power delay Profile ๐Ÿงฎ RMS Delay Spread ๐Ÿงฎ Simulator for Calculating RMS Delay Spread ๐Ÿงฎ Why is there significant multipath in the case of very high frequencies? ๐Ÿงฎ Why RMS Delay Spread is essential for wireless communication? ๐Ÿงฎ Why the Power Delay Profile is essential? ๐Ÿงฎ MATLAB Codes ๐Ÿ“š Further Reading Signal Processing RMS Delay Spread, Excess Delay Spread, and Multipath... RMS Delay Spread, Excess Delay Spread, and Multipath (MPCs) The fundamental distinction between wireless and wired connections is that in wireless connections signal reaches at receiver thru multipath signal propagation rather than directed transmission like co-axial cable. Wireless Communication has no set communication path between the transmitter and the receiver. The line of sight path, also known as the LOS path, is the shortest and most direc...
Read more

Constellation Diagrams of ASK, PSK, and FSK

๐Ÿ“˜ Overview ๐Ÿงฎ Simulator for constellation diagrams of ASK, FSK, and PSK ๐Ÿงฎ Theory ๐Ÿงฎ MATLAB Codes ๐Ÿ“š Further Reading BASK (Binary ASK) Modulation: Transmits one of two signals: 0 or -√Eb, where Eb​ is the energy per bit. These signals represent binary 0 and 1.    BFSK (Binary FSK) Modulation: Transmits one of two signals: +√Eb​ ( On the y-axis, the phase shift of 90 degrees with respect to the x-axis, which is also termed phase offset ) or √Eb (on x-axis), where Eb​ is the energy per bit. These signals represent binary 0 and 1.  BPSK (Binary PSK) Modulation: Transmits one of two signals: +√Eb​ or -√Eb (they differ by 180 degree phase shift), where Eb​ is the energy per bit. These signals represent binary 0 and 1.    Simulator for BASK, BPSK, and BFSK Constellation Diagrams SNR (dB): 15 Add A...
Read more

BER vs SNR for M-ary QAM, M-ary PSK, QPSK, BPSK, ...

๐Ÿ“˜ Overview of BER and SNR ๐Ÿงฎ Simulator for m-ary QAM and m-ary PSK ๐Ÿงฎ MATLAB Codes ๐Ÿ“š Further Reading Modulation Constellation Diagrams BER vs. SNR BER vs SNR for M-QAM, M-PSK, QPSk, BPSK, ... What is Bit Error Rate (BER)? The abbreviation BER stands for bit error rate, which indicates how many corrupted bits are received (after the demodulation process) compared to the total number of bits sent in a communication process. It is defined as,  In mathematics, BER = (number of bits received in error / total number of transmitted bits)  On the other hand, SNR refers to the signal-to-noise power ratio. For ease of calculation, we commonly convert it to dB or decibels.   What is Signal the signal-to-noise ratio (SNR)? SNR = signal power/noise power (SNR is a ratio of signal power to noise power) SNR (in dB) = 10*log(signal power / noise power) [base 10] For instance,...
Read more

UGC NET Electronic Science Previous Year Question Papers

Home / Engineering & Other Exams / UGC NET 2022: Previous Year Question Papers ...   NET | GATE | ESE | UGC-NET (Electronics Science, Subject code: 88 ) UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [December 2024] UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [June 2024] UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [December 2023] UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [June 2023] UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [December 2022]  UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [June 2022]   UGC Net Electronic Science Questions Paper With Answer Key Download Pdf [December 2021] UGC Net Electronic Science Questions With Answer Key Download Pdf [June 2020] UGC Net Electronic Science Questions With Answer Key Download Pdf [December 2019] UGC Net Electronic Science Questions With Answer...
Read more

MATLAB Code for Pulse Amplitude Modulation (PAM) and Demodulation

๐Ÿ“˜ Overview & Theory ๐Ÿงฎ MATLAB Code 1 ๐Ÿงฎ MATLAB Code 2 ๐Ÿงฎ MATLAB Code for Pulse Amplitude Modulation and Demodulation of Digital data ๐Ÿงฎ Other Pulse Modulation Techniques (e.g., PWM, PPM, DM, and PCM) ๐Ÿ“š Further Reading   Pulse Amplitude Modulation (PAM) & Demodulation MATLAB Script clc; clear all; close all; fm= 10; % frequency of the message signal fc= 100; % frequency of the carrier signal fs=1000*fm; % (=100KHz) sampling frequency (where 1000 is the upsampling factor) t=0:1/fs:1; % sampling rate of (1/fs = 100 kHz) m=1*cos(2*pi*fm*t); % Message signal with period 2*pi*fm (sinusoidal wave signal) c=0.5*square(2*pi*fc*t)+0.5; % square wave with period 2*pi*fc s=m.*c; % modulated signal (multiplication of element by element) subplot(4,1,1); plot(t,m); title('Message signal'); xlabel ('Time'); ylabel('Amplitude'); subplot(4,1,2); plot(t,c); title('Carrier signal'); xlabel('Time'); ylabel('Amplitu...
Read more

Coherence Bandwidth and Coherence Time

๐Ÿงฎ Coherence Bandwidth ๐Ÿงฎ Coherence Time ๐Ÿงฎ Coherence Time Calculator ๐Ÿงฎ Relationship between Coherence Time and Delay Spread ๐Ÿงฎ MATLAB Code to find Relationship between Coherence Time and delay Spread ๐Ÿ“š Further Reading   Coherence Bandwidth Coherence bandwidth is a concept in wireless communication and signal processing that relates to the frequency range over which a wireless channel remains approximately constant in terms of its characteristics. coherence bandwidth is  The inverse of Doppler spread delay time, or any spread delay time due to fading in general.  The coherence bandwidth is related to the delay spread of the channel, which is a measure of the time it takes for signals to traverse the channel. The two are related by the following formulae: Coherence bandwidth = 1/(delay spread time) Or, Coherence Bandwidth = 1/(root-mean-square delay spread time) (Coherence bandwidth in Hertz) For instance, the coherence bandwidth is...
Read more