Image Processing Reference
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(b)
(c)
Fig. 10. BER as a function of SIR for the CM3 channel (a) complex NBI; (b) multi-tone NBI;
(c) QPSK modulated NBI
The channel is subject to strong fading and, for the purposes of the experiments,
background AWGN is additionally applied, so that the Signal-to-AWGN ratio at the input
of the OFDM receiver is 20 dB. The SIR is varied from -20 dB to 0 dB. It can be seen (Fig. 10a)
that for high NBI, i.e. where the SIR is less than 0 dB, all methods lead to a significant
improvement in performance. The adaptive complex filtering scheme gives better
performance than the FE method. This could be explained by the NBI spectral leakage effect
caused by DFT demodulation at the OFDM receiver, when many sub-carriers near the
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