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Orthogonal frequency division multiplexing (OFDM) is noted for its resistance to narrowband interference when equipped with forward error correction. This technique along with erasure insertion is adequate when the the signal-to-interference ratio (SIR) is moderate, around 0 dB, however, when the interference is severe, i.e. SIR = -20 dB, a non-orthogonal interference corrupts a large number of the...
In this paper, we investigate the sidelobe power reduction of non-contiguous orthogonal frequency division multiplexing (OFDM) signals using a genetic algorithm (GA) approach. OFDM is widely deployed in numerous wireless access networks since it can achieve high data rate while simultaneously being robust to the effects of multipath propagation. Despite these advantages, OFDM produces a substantial...
In an OFDM system, known symbols referred to as pilot are transmitted across the time-frequency plane for the receiving device to estimate the channelpsilas time-frequency response in order to perform coherent demodulation of data symbols. The placement of these pilot symbols largely falls into two categories, namely, the regular and irregular patterns. Inspired by synchronization techniques used...
Theoretical and numerical analyses are conducted on the bit error rate (BER) of orthogonal frequency division multiplexing (OFDM)-based wireless LAN (WLAN) systems that are subjected to electromagnetic interference (EMI) caused by radiated noises from personal computers (PCs). The aim of the analysis is to investigate the impact of frequency- modulated harmonic noises generated by spread-spectrum...
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