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DMT Signaling Reference and AdvDCSM Application Example

Last Update: March 4, 2010, October 16, 2011.



The Figure 2 plot (shown below) displays the Simulated Bit Error Rate (BER) results for Convolutional Coded, Block Coded, and UnCoded cases where simulated Discrete MultiTone (DMT) Modulation Signaling occurs over a Non-Distorting, UnRestricted Bandwidth MultiCarrier/MultiChannel (MC).

If one compares Figure 1 (shown below or on the 'Nolta Simulated Systems Introduction' webpage) to Figure 2, one can readily see the effects of a bandwidth-limited MC on BER Performance as follows:

1) For UnCoded DMT, increasing the Eb/N0 has little effect in decreasing BER;

2) At low Eb/N0 and for UnCoded and Coded DMT, there is a order of magnitude difference in BER, i.e., loss in BER Performance; and

3) At high Eb/N0 and for UnCoded and Coded DMT, the BER spread increases dramatically.



Figure 2. Bit Error Probability for Coded and UnCoded DMT Signaling over
          Non-Distorting, UnRestricted Bandwidth MultiCarrier/MultiChannel (MC)
          with Additive White Gaussian Noise (AWGN): 
          r = 1/6, K = 4, [63,51,60,63] Best Non-Recursive Convolutional Code 
          and Viterbi Algorithm Decoder;
          L = 3, N = 6, [3,5,6] Systematic Block Code and Likelihood Block
          Decoder;
          3-MC, {l} = [2,2,2]: Gray Coded QPSK, 4-PAM and 4-QAM,
          SNRb: Eb/N0, QPSK = Eb/N0, 4-PAM = Eb/N0, 4-QAM;
          Non-Distorting, UnRestricted Bandwidth MC.



Figure 1. Bit Error Probability for Coded and UnCoded DMT Signaling over
          Distorting Bandwidth-Constrained MultiCarrier/MultiChannel (MC)
          with Additive White Gaussian Noise (AWGN): 
          r = 1/6, K = 4, [63,51,60,63] Best Non-Recursive Convolutional Code 
          and Viterbi Algorithm Decoder;
          L = 3, N = 6, [3,5,6] Systematic Block Code and Likelihood Block
          Decoder;
          3-MC, {l} = [2,2,2]: Gray Coded QPSK, 4-PAM and 4-QAM,
          SNRb: Eb/N0, QPSK = Eb/N0, 4-PAM = Eb/N0, 4-QAM;
          First Order Polynomial-based Low Pass Linear Filter MC.


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