Trellis Coded Modulation

[@jackass10165]

Maraming salamat po Sir Charleston!

[@qingyizhou4696]

Clear & helpful. Thanks a lot : )

[@markandeyajanaswamy]

Thanks for the clear explanation. Very helpful.

[@charlestondaleambatali4158]

You are most welcome

[@paulvg5010]

Me pueden ayudar con las diapositivas, no las encuentro y me ayudarían mucho

[@yusufaras6945]

Thanks a lot it is very helpful.

[@0MoTheG]

Looks like hierarchical encoding.

[@cpvaishya]

Generally QPSK to 8psk snr loss is approx 3.5dB. Why its shown as 5.38 dB?

[@charlestondaleambatali4158]

You are correct. Thank you for the correction. The formula should have used the *energy per bit* but it used the energy per symbol, instead.

[@huyen121092]

please ask, What is the difference between Hamming and euclidean distance in TCM code?

[@charlestondaleambatali4158]

Hamming distance is used when we are in the bit level while Euclidean distance is used in the symbol level. Since TCM uses symbols, we use the Euclidean distance to demodulate it.

[@huyen121092]

@@charlestondaleambatali4158 Can I call a TCM code is a nonlinear code?

[@charlestondaleambatali4158]

@@huyen121092 it’s not a code per se. It’s a digital modulation technique mixed with a convolutional code. Basically, it’s difficult to categorize.

[@huyen121092]

What is disadvantages of TCM?

[@charlestondaleambatali4158]

Basically, the complexity of the system.

[@atmson1955]

When using TCM, will I use the channle code?

[@charlestondaleambatali4158]

TCM is already a form of channel coding, specifically, convolutional coding. It merges channel coding and symbol mapping (digital modulation) into one function.

[@atmson1955]

@@charlestondaleambatali4158 soft-Decision Viterbi Decoding?

[@charlestondaleambatali4158]

@@atmson1955 Yes. That is the decoding process. However, the approach is different.