Trellis

How to get trellis-coded modulation trellis after set partitioning?

How to get trellis-coded modulation trellis after set partitioning?
  1. What is trellis encoding?
  2. Why trellis coded modulation is required?
  3. What are the advantages of trellis codes?

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.

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.

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.

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