Generate a square pulse

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Ahmed Hassanen
Ahmed Hassanen 2021-11-3
回答： Abhinaya Kennedy 2024-6-12
create exactly one square pulse with the specified parameters. This square pulse should be stored in the array called one_square. The dimensions of this array should be 1 x N_sq_pos. The length of the square pulse you generate should be equal to N_sq_pos, i.e., the variable one_square should not change dimensions after you generate the pulse. Keep in mind that you have to set the energy of the square pulse to be equal to E_bit.
Inputs:
% t_axis: Time axis
% T_sq_dur: Duration of the square pulse in seconds
% E_bit: Total energy in all samples of one square pulse
% fs: Sampling frequency
% x_bits: Sequence of input bits (if not available, then it is equal
% to 1)
% type: Type of bit coding, 'RZ' or 'NRZ' (default is 'RZ')
% Outputs:
% x_square: The sequence of samples corresponding to the pulse shaping
% of the input bits using a square pulse shape
Output like this :
  1 个评论
Ahmed Hassanen
Ahmed Hassanen 2021-11-3
编辑：Ahmed Hassanen 2021-11-3
Fixed Parameter:
fs = 1e5; % Sampling rate (samples per sec)
Ts = 1/fs; % Sampling time
N = 102400 - 1; % Total number of samples
t_axis = (0:N-1)*Ts; % Time axis (the same during the entire experiment)
f_axis = -fs/2:fs/N:fs/2-1/N; % Frequency axis (the same during the entire experiment)
T_sq = 100*Ts; % The duration of the square pulse (an integer number of sampling times)

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回答（1 个）

Abhinaya Kennedy
Abhinaya Kennedy 2024-6-12
Generating the Pulse:
  1. Create a time axis "(t_axis)" from "0" to "T_sq_dur" with samples based on "fs".
  2. Calculate pulse amplitude (A) using "A = sqrt(E_bit / T_sq_dur)".
  3. Generate a binary sequence "(x_square)" with "x_bits" for the pulse duration (considering RZ transitions if applicable).
  4. Scale the sequence by A to get the final pulse with the required energy level.\
Square wave generation: https://www.mathworks.com/help/signal/ref/square.html
Array Dimensions:
The pulse ("one_square") should be a 1 x N_sq_pos array, where N_sq_pos is the number of samples based on "fs". This ensures the array maintains its size after generation.
By following these steps, you can create a square pulse and store it in the "one_square" array for further use.

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