# 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.
```

Digital Communication Systems (Convolutional Coded, Block Coded, or UnCoded) using Discrete MultiTone (DMT) Modulation Signaling are complex systems that involve complex System and Subsystem models.

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