Trellis Coded Modulation

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Trellis coded modulation”.

1. Adding improvement to the signal subset choice by starting with the densest possible lattice for the space is called as
a) Optimum signal constellation boundaries
b) Higher density lattice structures
c) Trellis coded modulation
d) None of the mentioned

2. Choosing a closely packed signal subset from any regular lattice or array of candidate points is called as
a) Optimum signal constellation boundaries
b) Higher density lattice structures
c) Trellis coded modulation
d) None of the mentioned

3. Trellis coded modulation uses
a) Non binary method
b) Uses redundant bits
c) No expansion of bandwidth
d) All of the mentioned

4. In finite state machines, output is predicted using
a) Past output
b) Present input
c) Past output & Present input
d) None of the mentioned

5. In TCM the signals are decoded using
a) Soft decision decoders
b) Hard decision decoders
c) Soft & Hard decision decoders
d) None of the mentioned

6. Trellis coded modulation scheme
a) Has memory
b) Is memory-less
c) Needs more bandwidth
d) None of the mentioned

7. In TCM channel capacity can be increased.
a) True
b) False

8. Transmission bandwidth depends on
a) Rate of signalling
b) Density of signal points
c) Reduced distance
d) None of the mentioned

9. Which determines the error performance in TCM?
a) Reduced distance
b) Free distance
c) Bandwidth
d) None of the mentioned

10. The TCM decoder uses
a) Minimum likelihood detector
b) Maximum likelihood detector
c) Does not use redundant bits
d) None of the mentioned

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