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Reducing Low Data Throughput Problems in Data Network Caused by Adjacent Channel Interference Using FIR Filter

Etuka, F. I., Akoma, C. S. and, Nwosu O. F

Abstract

Throughput enhancement in a data communication network can be achieved by reducing the bit error rate. This study presents the development and simulation of a band-pass finite impulse response filter in a MATLAB environment. The developed band-pass filter allows only a specific range of frequencies to pass through while attenuating other undesired frequencies. The performance of the digital communication system, in terms of bit error rate, is evaluated both with and without the incorporation of the designed band-pass filter, in the presence of two adjacent channel interferers. When interferers are added to the transmitted signal, the interfering signal moves to the frequency band of the original signal, causing the bit error rate to deteriorate. The bit error rate worsens with a decrease in frequency offset and negative gain of the interferers. The likelihood of bit error rate with and without the filter is compared. The results show that the band-pass FIR filter decreases the bit error rate to almost zero, especially when Eb/No is 7.5000 and 8.0000, compared to the bit error rate of 0.0790 and 0.0173 obtained without the filter. It is also observed that the overall transmission error is reduced by increasing the ratio of bit energy per symbol. The MATLAB environment was used for the simulation of the interferers and the filter.

Keywords

Throughputbit error rateadjacent channelinterferenceFIR Filter

References

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