TM111 TMA03 MARKED 2025 UPDATE
CERTIFICATION EVALUATION 2026
SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Fixed Length Coding (4.2.3). Answer: A code using a fixed number of
bits.
⩥ Variable Length Coding (4.2.4). Answer: A code in which the number
of bits used may vary.
⩥ Interference (4.3.1). Answer: Any unwanted intrusion on a wanted
signal, increasing the probability of an error - an bit error being when a
transmitted 1 is interpreted as a 0 by the receiver and vice versa.
⩥ Noise (4.3.1). Answer: Electrical interference.
⩥ Multipath Interference (4.3.1). Answer: Interference caused by the
arrival of reflected signals that have followed different paths and
therefore been delayed by different amounts
⩥ Bandwidth in radio transmission (4.3.2). Answer: The transmission
capacity of a communication channel, as measured by the difference
, between the highest and lowest frequencies that can be transmitted by
that channel.
⩥ Licensed Spectrum (4.3.2). Answer: Radio spectrum that can only be
used by the holder of an appropriate licence, e.g. radio and television
broadcasting, military radio and emergency-services radio.
⩥ Pros and Cons of Licensed Spectrum (4.3.2). Answer: Pros:
-Less susceptible to interference and therefore should suffer fewer data
errors
- Positive consequences of this could be longer battery life and longer
range for a given transmission power.
Cons:
- The associated cost will have to be recouped, probably in the charges
to customers.
⩥ Pros and Cons of Unlicensed Spectrum (4.3.2). Answer: Pros:
- Free to use, no associated cost
Cons:
- Limited range due to the low maximum transmission power
- Higher levels of interference expected to increase the error rate.
CERTIFICATION EVALUATION 2026
SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Fixed Length Coding (4.2.3). Answer: A code using a fixed number of
bits.
⩥ Variable Length Coding (4.2.4). Answer: A code in which the number
of bits used may vary.
⩥ Interference (4.3.1). Answer: Any unwanted intrusion on a wanted
signal, increasing the probability of an error - an bit error being when a
transmitted 1 is interpreted as a 0 by the receiver and vice versa.
⩥ Noise (4.3.1). Answer: Electrical interference.
⩥ Multipath Interference (4.3.1). Answer: Interference caused by the
arrival of reflected signals that have followed different paths and
therefore been delayed by different amounts
⩥ Bandwidth in radio transmission (4.3.2). Answer: The transmission
capacity of a communication channel, as measured by the difference
, between the highest and lowest frequencies that can be transmitted by
that channel.
⩥ Licensed Spectrum (4.3.2). Answer: Radio spectrum that can only be
used by the holder of an appropriate licence, e.g. radio and television
broadcasting, military radio and emergency-services radio.
⩥ Pros and Cons of Licensed Spectrum (4.3.2). Answer: Pros:
-Less susceptible to interference and therefore should suffer fewer data
errors
- Positive consequences of this could be longer battery life and longer
range for a given transmission power.
Cons:
- The associated cost will have to be recouped, probably in the charges
to customers.
⩥ Pros and Cons of Unlicensed Spectrum (4.3.2). Answer: Pros:
- Free to use, no associated cost
Cons:
- Limited range due to the low maximum transmission power
- Higher levels of interference expected to increase the error rate.
