In this paper, the principles of maximum likelihood sequence estimation (MLSE) are used to develop an adaptive equalizer, which is an extension of the. The MLSE Equalizer block uses the Viterbi algorithm to equalize a linearly modulated signal through a dispersive channel. The block processes input frames and outputs the maximum likelihood sequence estimate (MLSE) of the signal, using an estimate of the channel modeled as a ‎Description · ‎Signal Constellation · ‎Reset Every Frame · ‎Parameters. MLSE (Maximum likelihood sequence estimation). – Filtering. • Transversal filtering. – Zero-forcing equalizer. – Minimum mean square error (MSE) equalizer.


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The preamble or postamble must already be included at the beginning or end, respectively, of the input signal to this block.

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To learn how the block uses the preamble and postamble, see "Reset Every Frame" Operation Mode below. You can mlse equalizer this mode using the Operation mode parameter. In Reset every frame mode, the block decodes each frame of data mlse equalizer, resetting the state metric at the end of each frame.

The traceback decoding always starts at the state with the minimum state metric.

MLSE Equalizer | Lumerical Knowledge Base

If you do not specify a preamble, the decoder initializes the metrics of all states to 0 at the beginning of each frame of data. If you specify a preamble, the block uses it to initialize the state metrics at the mlse equalizer of each frame of data.


More specifically, the block decodes the preamble and assigns a metric of 0 to the decoded state. If the preamble does mlse equalizer decode to a unique mlse equalizer -- that is, if the length of the preamble is less than the channel memory -- the decoder assigns a metric of 0 to all states that can be represented by the preamble.

Whenever you specify a preamble, the traceback path ends at one of the states represented by the preamble. If you do not specify a postamble, the traceback path mlse equalizer at the state with the smallest metric. If you specify mlse equalizer postamble, the traceback path begins at the state represented by the postamble.

If the postamble does not decode to a unique state, the decoder identifies the smallest of all possible decoded states that are represented by the postamble and begins traceback decoding at that state. Continuous Operation Mode An alternative way that the Viterbi algorithm can transition between successive frames is called Continuous with reset option mode.

In Continuous with reset option mode, the block initializes the metrics of all states to 0 at the beginning of the simulation. At the end of each mlse equalizer, the block saves the internal state metric for use in computing the traceback paths in the next frame.

Maximum likelihood sequence estimation - Wikipedia

If you select Enable the reset input port, the block displays another input port, labeled Rst. In this case, the block resets the state metrics whenever the scalar value at the Rst port is nonzero. Parameters Specify channel via The method for specifying the mlse equalizer estimate.


mlse equalizer If you select Input port, the block displays a second input port that receives the channel estimate. If you select Dialog, you can specify the channel estimate as a vector of coefficients for an Mlse equalizer filter in the Channel coefficients field.

Channel coefficients Vector containing the coefficients of the FIR filter that the block uses for the channel estimate.

Maximum-Likelihood Sequence Estimation (MLSE) Equalizer

This field is visible only if you set Specify channel via to Mlse equalizer. Signal constellation Vector of complex numbers that specifies the constellation for the modulation.

  • Equalize using Viterbi algorithm - Simulink
  • Maximum likelihood sequence estimation

mlse equalizer Traceback depth The number of trellis branches equivalently, the number of symbols the block uses in the Viterbi algorithm to construct each traceback path. Operation mode The operation mode of the Viterbi decoder.

Maximum-Likelihood Sequence Estimation (MLSE) Equalizer

Choices are Continuous with reset option and Mlse equalizer every frame. Input contains preamble When checked, you can set the preamble in the Expected preamble field.

All possible transmitted data streams are fed into this distorted channel model. The receiver compares the time response with the actual received signal and determines the most likely signal.