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ASK, FSK, and PSK (with MATLAB + Online Simulator)






















         📘 Overview      📘 Amplitude Shift Keying (ASK)      📘 Frequency Shift Keying (FSK)      📘 Phase Shift Keying (PSK)      📘 Which of the modulation techniques—ASK, FSK, or PSK—can achieve higher bit rates?      🧮 MATLAB Codes      📘 Simulator for binary ASK, FSK, and PSK Modulation      📚 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 example, "+5 Volt" (upper level) and "0 Volt" (lower level).          To transmit binary bit "1", the transmitter sends "+5 Volts", and for bit "0", it sends no power.         The receiver uses filters to detect whether a binary "1" or "0" was transmitted.      ...




















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BER vs SNR for M-ary QAM, M-ary PSK, QPSK, BPSK, ...(MATLAB Code + Simulator)






















        📘 Overview of BER and SNR      🧮 Online Simulator for BER calculation      🧮 MATLAB Code for BER calculation      📚 Further Reading                       📂 View Other Topics on M-ary QAM, M-ary PSK, QPSK ...                         🧮 Online Simulator for Constellation Diagram of m-ary QAM          🧮 Online Simulator for Constellation Diagram of m-ary PSK          🧮 MATLAB Code for BER calculation of ASK, FSK, and PSK          🧮 MATLAB Code for BER calculation of Alamouti Scheme          🧮 Different approaches to calculate BER vs SNR                                      What is Bit Error Rate (BER)?              The abbreviation BER stands for Bit Error Rate, which indicates how many corrupted bits are received compared to the total number of bits sent.              BER = (number of bits received in error) / (total number of transmitted bits)                                 What is Signal-to-Noise Ratio (SNR)?              SNR is the ratio of signal power to noise powe...




















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Calculation of SNR from FFT bins in MATLAB






















         📘 Overview      🧮 MATLAB Code for Estimation of SNR from FFT bins      🧮 MATLAB Code for SNR from PSD using Kaiser Window      📚 Further Reading       Here, you can find the SNR of a received signal from periodogram / FFT bins using the Kaiser operator. The beta (β) parameter characterizes the Kaiser window, which controls the trade-off between the main lobe width and the side lobe level.   Steps     Set up the sampling rate and time vector    Compute the FFT and periodogram    Calculate the frequency resolution and signal power    Exclude the signal power from noise calculation    Compute the noise power and SNR    MATLAB Code for Estimation of SNR from FFT bins  clc; clear; close all; % Parameters fs = 8000; f_tone = 1000; N = 8192;  t = (0:N-1)/fs;  % Generate signal + noise signal = sin(2*pi*f_tone*t); SNR_true_dB = 20;  signal_power = mean(signal.^2); noise_power = signal_power / (10^(SNR_true_dB/10)); noisy_signal = signal + sqrt(noise_power) * randn(1, N);  % Apply ...




















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MATLAB Code for ASK, FSK, and PSK (with Online Simulator)






















         📘 Overview & Theory      🧮 MATLAB Code for ASK      🧮 MATLAB Code for FSK      🧮 MATLAB Code for PSK      🧮 Simulator for binary ASK, FSK, and PSK Modulations      📚 Further Reading                        ASK, FSK & PSK HomePage        MATLAB Code MATLAB Code for ASK Modulation and Demodulation        % The code is written by SalimWireless.Com  % Clear previous data and plots clc; clear all; close all;  % Parameters Tb = 1;             % Bit duration (s) fc = 10;            % Carrier frequency (Hz) N_bits = 10;        % Number of bits Fs = 100 * fc;      % Sampling frequency (ensure at least 2*fc, more for better representation) Ts = 1/Fs;          % Sampling interval samples_per_bit = Fs * Tb; % Number of samples per bit duration  % Generate random binary data rng(10);            % Set random seed for reproducibility binary_data = randi([0, 1], 1, N_bits); % Generate random binary data (0 or 1)  % Initialize arrays for continuous signals t_overall = 0:Ts:(N_bits...




















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Online Simulator for ASK, FSK, and PSK






















    Try our new Digital Signal Processing Simulator!          Start                          Simulator for binary ASK Modulation                                                   Message Bits (e.g. 1,0,1,0)                                                                Carrier Frequency (Hz)                                                                Sampling Frequency (Hz)                                                       Run Simulation                                     Simulator for binary FSK Modulation                                               Input Bits (e.g. 1,0,1,0)                                                                Freq for '1' (Hz)                                                                Freq for '0' (Hz)                                                                  Sampling Rate (Hz)                                          Visualize FSK Signal                                   Simulator for BPSK Modulation                    ...




















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Constellation Diagrams of ASK, PSK, and FSK with MATLAB Code + Simulator






















          📘 Overview of Energy per Bit (Eb / N0)      🧮 Online Simulator for constellation diagrams of ASK, FSK, and PSK      🧮 Theory behind Constellation Diagrams of ASK, FSK, and PSK      🧮 MATLAB Codes for Constellation Diagrams of ASK, FSK, and PSK      📚 Further Reading                📂 Other Topics on Constellation Diagrams of ASK, PSK, and FSK ...                    🧮 Simulator for constellation diagrams of m-ary PSK          🧮 Simulator for constellation diagrams of m-ary QAM             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...




















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Comparing Baseband and Passband Implementations of ASK, FSK, and PSK






















          📘 Overview      🧮 Baseband and Passband Implementations of ASK, FSK, and PSK      🧮 Difference betwen baseband and passband      📚 Further Reading                📂 Other Topics on Baseband and Passband ...                    🧮 Baseband modulation techniques      🧮 Passband modulation techniques               Baseband modulation techniques are methods used to encode information signals onto a baseband signal (a signal with frequencies close to zero). Passband techniques shift these signals to higher carrier frequencies for transmission. Here are the common implementations:     Amplitude Shift Keying (ASK) [↗] :    In ASK, the amplitude of the signal is varied to represent different symbols.         Binary ASK (BASK) is a common implementation where two different amplitudes represent binary values (0 and 1).         ASK is simple but susceptible to noise. ASK Baseband (Digital Bits) ASK Passband (Modulated Carrier)     Fig 1:  ASK Passband Modulation (...




















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LDPC Encoding and Decoding Techniques






















          📘 Overview & Theory      🧮 LDPC Encoding Techniques      🧮 LDPC Decoding Techniques      📚 Further Reading      'LDPC' is the abbreviation for 'low density parity check'. LDPC code H matrix contains very few amount of 1's and mostly zeroes. LDPC codes are error correcting code. Using LDPC codes, channel capacities that are close to the theoretical Shannon limit can be achieved.  Low density parity check (LDPC) codes are linear error-correcting block code suitable for error correction in a large block sizes transmitted via very noisy channel. Applications requiring highly reliable information transport over bandwidth restrictions in the presence of noise are increasingly using LDPC codes. 1. LDPC Encoding Technique The proper form of H matrix is derived from the given matrix by doing multiple row operations as shown above. In the above, H is parity check matrix and G is generator matrix. If you consider matrix H as [-P' | I] then matrix G will b...




















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