RF Impairments & Corrections

Est. read time: 1 minute | Last updated: July 07, 2025 by John Gentile

Contents

Noise
DC Offset Removal
I/Q Offset Correction
Wireless Channels
References

from IPython.display import YouTubeVideo
import numpy as np
import matplotlib.pyplot as plt

YouTubeVideo('PNMOwhEHE6w')

YouTubeVideo('LBLvmNyAdSI')

Noise

DC Offset Removal

I/Q Offset Correction

Wireless Channels

N = 5000000
EbNodB_range = range(11)
itr = len(EbNodB_range)
ber = [None]*itr

for n in range (itr): 
    EbNodB = EbNodB_range[n]   
    EbNo=10.0**(EbNodB/10.0)
    x = 2 * (np.random.rand(N) >= 0.5) - 1
    noise_std = 1/np.sqrt(2*EbNo)
    y = x + noise_std * np.random.randn(N)
    y_d = 2 * (y >= 0) - 1
    errors = (x != y_d).sum()
    ber[n] = 1.0 * errors / N

plt.figure()
plt.plot(EbNodB_range, ber, 'bo', EbNodB_range, ber, 'k')
plt.axis([0, 10, 1e-6, 0.1])
plt.xscale('linear')
plt.yscale('log')
plt.xlabel('EbNo(dB)')
plt.ylabel('BER')
plt.grid(True)
plt.title('BPSK Modulation')
plt.show()

png

RF Impairments & Corrections

Noise

DC Offset Removal

I/Q Offset Correction

Wireless Channels

References