International Journal of Innovative Engineering, Technology & Science

Mitigation of Interference in Colocated Wireless Systems Using Baseband QPSK Post Distortion Cancellation
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Mitigation of Interference in Colocated Wireless Systems Using Baseband QPSK Post Distortion Cancellation

Publication Date : 12/05/2020


Author(s) :

Okereke, J. O, Nwabueze, C. A., Akaneme, S. A.


Volume/Issue :
Volume 3
,
Issue 1
(05 - 2020)



Abstract :

Intermodulation interference occurs when transmitters are co-located as well as in nonlinearity of the signal processing during modulation. This distortion in nonlinear systems are not needed in radio signal processing because they generate unwanted spurious emissions which occupy the spectrum of the desired signal frequency as sidebands thereby distorting or masking the desired signal. A post distortion cancellation technique is proposed, using quadrature phase shift keying (QPSK) baseband receiver that is capable of cancelling the intermodulation interference. In the proposed model, an estimated copy of the distortion is coupled to a QPSK baseband receiver to be out of phase to each other to cancel out the intermodulation interference using structured system analysis and design methodology. This proposed technique was carried out using MATLAB/SIMULINK software where an intermodulation distortion is generated using two local colocated transmitters that have hit the desired signal and recover the transmitted message successfully. This technique is capable of cancelling intermodulation interference that occurs in co-located setting and is able to recover the transmitted signal that gets to the receiver, achieving a low bit error rate (BER) of 0.00064, high gain of 40dB in signal-to-noise ratio (SNR) and


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