Mitigating Class-A Impulsive Noise of Long Term Evolution Uplink and Downlink
The performance of wireless communication systems is greatly affected by man-made noise in urban environments. Man-made noise has impulsive natural and arises from several sources like power lines, ignition of cars, heavy current switches and other sources. In this paper, the effect of class-A impulsive noise on the bit error rate (BER) performance of LTE system is investigated over frequency selective fading channel. A method is proposed to reduce the effect of the impulsive noise on the performance of LTE uplink which uses SC-FDMA and LTE downlink which uses OFDMA. The method is based on using companding transform at the transmitter to reduce the peak to average power ratio (PAPR) of the OFDMA signal. Then use a clipping in OFDMA and SC-FDMA receiver to clip the incoming signal when it exceeds certain threshold followed by decompanding transform to recover the companded received signal. Numerical results show that the proposed method enhances the BER performance of the LTE uplink and downlink.
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Document Type: Research Article
Publication date: March 1, 2016
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