An adaptive filter using the least mean squares (LMS) method can be implemented using Python by following these steps:
Step 1: Import the necessary libraries
import numpy as np
import matplotlib.pyplot as plt
Step 2: Define the input signal and the desired output signal
n = 500
x = np.random.normal(0, 1, n)
d = np.sin(2*np.pi*0.05*np.arange(n)) + np.random.normal(0, 0.1, n)
Step 3: Define the initial filter coefficients and the step size
w = np.zeros(10)
mu = 0.1
Step 4: Implement the LMS algorithm using a loop
y = np.zeros(n)
e = np.zeros(n)
for i in range(10, n):
y[i] = np.dot(w, x[i-10:i])
e[i] = d[i] - y[i]
w = w + mu * e[i] * x[i-10:i]
Step 5: Plot the input signal, the desired output signal, and the filtered output signal
plt.figure()
plt.subplot(311)
plt.plot(x)
plt.title('Input Signal')
plt.subplot(312)
plt.plot(d)
plt.title('Desired Output Signal')
plt.subplot(313)
plt.plot(y)
plt.title('Filtered Output Signal')
plt.show()
The full code is shown below:
import numpy as np
import matplotlib.pyplot as plt
n = 500
x = np.random.normal(0, 1, n)
d = np.sin(2*np.pi*0.05*np.arange(n)) + np.random.normal(0, 0.1, n)
w = np.zeros(10)
mu = 0.1
y = np.zeros(n)
e = np.zeros(n)
for i in range(10, n):
y[i] = np.dot(w, x[i-10:i])
e[i] = d[i] - y[i]
w = w + mu * e[i] * x[i-10:i]
plt.figure()
plt.subplot(311)
plt.plot(x)
plt.title('Input Signal')
plt.subplot(312)
plt.plot(d)
plt.title('Desired Output Signal')
plt.subplot(313)
plt.plot(y)
plt.title('Filtered Output Signal')
plt.show()
Please start posting anonymously - your entry will be published after you log in or create a new account. This space is reserved only for answers. If you would like to engage in a discussion, please instead post a comment under the question or an answer that you would like to discuss
Asked: 2023-05-19 10:07:58 +0000
Seen: 8 times
Last updated: May 19 '23
How can I use oversampling to address a problem?
What is the process for obtaining metadata from my Python-Django project in order to execute SSO?
How can Django Admin accommodate a variety of formats and locales for its input fields?
How can an array be passed using typo3 flexform xml and itemsProcConfig?
Is it possible to invoke an asynchronous function without using the await keyword?