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It was found that DPD gave better performance than equalization in terms of TD.
Therefore, it can be concluded that the proposed PN-PAM transmission scheme outperforms the classical PAM with DFE equalization in terms of both BER performance and overall system throughput.
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Finally, analytical comparison of both cases reveals that pre-equalization always performs no worse than post-equalization in terms of the BER for the same optical transmit power.
In summary, based on instrumental measures, it can be said that PMINT using the optimal intrusively determined reshaping filter length (L^{text {opt}}_{g}) is a robust and perceptually advantageous equalization technique, yielding a high reverberant energy suppression and outperforming all other considered equalization techniques in terms of perceptual speech quality.
The numerical results show that the proposed frequency-domain equalization schemes significantly outperform conventional linear minimum mean square error-based equalizers in terms of bit error rate performance with moderate increase in computational complexity.
The next question is whether post-equalization or pre-equalization performs better in terms of the BER for a given DC bias Bpost=Bpre=B.
In Figure8, the convergence of the CG equalization is plotted in terms of the bit error rate (BER) against the number of iterations at SNR=30 dB for Case I. Since ε<1, frequency-domain equalization (FDE) is carried out.
The performance of the equalization techniques is evaluated in terms of the reverberant energy suppression and perceptual speech quality improvement.
Turbo equalization becomes exceedingly complex in terms of the number of computations, due to the high computational complexity of the MAP equalizer and MAP decoder most often used in a turbo equalizer.
Conversely, applying despreading before equalization should have an impact in terms of performance for a channel being nonconstant in frequency.
On multipath channels, it offers a crucial advantage in terms of equalization, which is performed in the frequency domain, leading to high performance and no additional delay.
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