Preamble reconstruction method for impulsive interference avoidance in MIMO-OFDM receivers

摘要

For wireless packet transmissions, preambles are essential to make packet synchronization function. Impulsive interference not only distorts datum, but also degrades link reliability. To deal with such distortions, a peak-to-average ratio (PAPR) detection is adopted to search impulsive positions and the convolution with the estimated time-domain response is used to recovery the distorted preambles. Simulations of a 2×2 MIMO-OFDM system with RF impairments in frequency-selective fading indicate that the SNR loss is about 2.5 dB ∼ 4.6 dB to ensure synchronization working at a signal-to-impulse ratio (SIR) of −10 dB.