Trellis

Trellis code

Trellis code
  1. What is trellis encoding?
  2. What is the object of trellis coding?
  3. What are the advantages of trellis codes?
  4. Why trellis coded modulation is required?

What is trellis encoding?

Trellis coded modulation (TCM) combines modulation and encoding processes to achieve better efficiency without increasing the bandwidth. Bandwidth-constrained channels operate in the region R / W > 1, where R = data rate and W = bandwidth available.

What is the object of trellis coding?

The objective of trellis-coded modulation is to increase the minimum distance between the signals that are the most likely to be confused, without increasing the average signal power.

What are the advantages of trellis codes?

Trellis coding offers a means of increasing data rate without increasing transmitted bandwidth. This is ideally suited to experimental verification. The gain is achieved with multi-level, multi-phase signalling.

Why trellis coded modulation is required?

The basic idea underlying Trellis-Coded Modulation (TCM) is to use a convolutional code to generate the redundancy necessary to achieve a coding gain, while preventing bandwidth expansion by increasing the size of the constellation rather than the number of transmitted symbols.

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