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Questions and Answers
What is the value of orthogonal carriers in OFDM?
What is the value of orthogonal carriers in OFDM?
- They cause frequency selective fading.
- They increase the peak-to-average power ratio.
- They improve opportunistic scheduling.
- They reduce the number of oscillators needed. (correct)
Which technique combats frequency selective fading?
Which technique combats frequency selective fading?
- OFDMA
- OFDM (correct)
- SC-FDMA
- Opportunistic Scheduling
What is the main problem associated with the peak-to-average power ratio (PAPR) in OFDM?
What is the main problem associated with the peak-to-average power ratio (PAPR) in OFDM?
- It affects the signal quality.
- It increases the power consumption. (correct)
- It reduces the number of oscillators needed.
- It causes frequency selective fading.
How is multiple access achieved using OFDM and SC-FDMA?
How is multiple access achieved using OFDM and SC-FDMA?
What technique has created great expansion in the capacity of communication systems?
What technique has created great expansion in the capacity of communication systems?
Flashcards
Value of Orthogonal Carriers
Value of Orthogonal Carriers
Orthogonal carriers in OFDM reduce the overall number of oscillators required in the system.
Combating Frequency Selective Fading
Combating Frequency Selective Fading
OFDM is a method to combat frequency selective fading, by dividing the signal into multiple narrowband channels.
PAPR Problem in OFDM
PAPR Problem in OFDM
A high peak-to-average power ratio in OFDM increases power consumption, requiring more efficient amplification.
Multiple Access in OFDM/SC-FDMA
Multiple Access in OFDM/SC-FDMA
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Capacity Expansion
Capacity Expansion
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Study Notes
Orthogonal Frequency Division Multiplexing (OFDM)
- Orthogonal carriers in OFDM enable simultaneous transmission of multiple signals, increasing the data rate and spectral efficiency.
- OFDM is resistant to frequency selective fading due to the presence of cyclic prefix, which combats intersymbol interference (ISI).
Peak-to-Average Power Ratio (PAPR) in OFDM
- The main problem associated with PAPR in OFDM is that it leads to inefficient use of power amplifiers, reducing the system's power efficiency.
Multiple Access in OFDM and SC-FDMA
- Multiple access in OFDM and SC-FDMA is achieved through orthogonal frequency division multiple access (OFDMA), where different users are assigned different subcarriers.
Capacity Expansion in Communication Systems
- The technique that has created great expansion in the capacity of communication systems is Orthogonal Frequency Division Multiplexing (OFDM).
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