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Questions and Answers
What is the maximum user experienced data rate in urban/suburban areas?
What is the maximum user experienced data rate in urban/suburban areas?
- 100 Mbps (correct)
- 10 Gbps
- Devices per km2
- 1 ms
What is the main idea behind OFDM?
What is the main idea behind OFDM?
- To minimize energy efficiency
- To synchronize all users in the downlink
- To divide data stream into parallel streams with reduced data rate (correct)
- To maximize spectrum overflow
What is the main problem with OFDM related to spectrum overflow?
What is the main problem with OFDM related to spectrum overflow?
- It needs guard bands to prevent spectrum overflow (correct)
- It is insensitive to frequency, clock, and phase offset
- It requires different symbol sizes and cyclic prefix
- It allows carriers to overlap without any interference
What is the new radio multiplexing technology that divides the band into multiple sub-bands, each using different OFDM parameters?
What is the new radio multiplexing technology that divides the band into multiple sub-bands, each using different OFDM parameters?
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What is the maximum peak data rate per user under ideal conditions for mobiles?
What is the maximum peak data rate per user under ideal conditions for mobiles?
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Study Notes
5G Technology
- The maximum user-experienced data rate in urban/suburban areas is 1 Gbps.
Orthogonal Frequency Division Multiplexing (OFDM)
- The main idea behind OFDM is to divide a high-rate data stream into multiple low-rate streams, modulating each stream on a separate subcarrier, and transmitting them simultaneously over the same channel.
- The main problem with OFDM is spectrum overflow, where the signals from adjacent subcarriers interfere with each other.
New Radio Multiplexing Technology
- The new radio multiplexing technology divides the band into multiple sub-bands, each using different OFDM parameters.
Peak Data Rate
- The maximum peak data rate per user under ideal conditions for mobiles is 20 Gbps.
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