Abstract
Pulse blanking is a widely used method to eliminate impulsive interference in an orthogonal frequency division multiplexing (OFDM) receiver. To analyze the effect of the inter-carrier interference caused by pulse blanking on the symbol error rate (SER) performance of OFDM employing maximum ratio combining (MRC) receiver, the analytical expression of the signal-to-interference-noise ratio (SINR) of the OFDM employing MRC receiver is derived. Based on the SINR expression, furthermore, the SER performances over both Rayleigh and Ricean fading channels are also analyzed quantitatively. Simulation results validate the correctness of the derived formulas.
Highlights
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which converts a frequency-selective channel into a parallel collection of frequency flat subchannels
The OFDM transmission scheme is widely employed in wireless and wired communications, e.g., digital subscriber lines (DSL), digital video broadcasting (DVB), digital audio broadcasting (DAB), wireless local area networks (WLAN), power line communications (PLC), long term evolution (LTE), and L-band digital aeronautical communication system (L-DACS) [1]
OFDM systems are often exposed to impulsive interference, e.g., ignition noise of passing vehicles, impulsive noise in power line or other systems operating in the same frequency range
Summary
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which converts a frequency-selective channel into a parallel collection of frequency flat subchannels. Compared with single-carrier communication systems, OFDM has advantages, such as spectral efficiency, efficient implementation based on the fast Fourier transform (FFT), and simple channel equalization. To suppress the effect of impulsive noise on an OFDM receiver, an interference mitigation method based on pulse blanking is first proposed in [4,5,6]. A closed-form expression for the SINR of the MRC-OFDM receiver with pulse blanking over frequency selective fading channel is derived. The SER performances of the MRC-OFDM receiver with pulse blanking over both Rayleigh and Ricean fading channels are analyzed quantitatively based on this SINR expression.
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