Howtosignalprocessing
- What is spectral efficiency in OFDM?
- Which modulation scheme has the highest spectral efficiency?
- What improves the spectral efficiency of F OFDM?
- Which access technique has a very high spectral efficiency?
What is spectral efficiency in OFDM?
To achieve higher spectral efficiency in OFDM, high-level subcarrier modulation formats and coherent detection play a very important role. A spectral efficiency of 8.0 bit/s/Hz has been realized with 32 QAM subcarrier modulation, where a 400 Gbit/s PDM-OFDM signal was transmitted with a channel spacing of 50 GHz [62].
Which modulation scheme has the highest spectral efficiency?
Explanation: MSK is spectrally more efficient than the other modulation schemes.
What improves the spectral efficiency of F OFDM?
It is known that the symbol rate of OFDM should not exceed the maximum rate of Nyquist criterion, otherwise the inter-symbol interference (ISI) would seriously affect the system performance. To fulfil the increasing spectral efficiency requirements, higher-order modulation methods are adopted.
Which access technique has a very high spectral efficiency?
7.4. 1 NOMA. NOMA has been envisioned as a promising radio access technique for 5G and beyond networks by allowing multiple users to access the same time-frequency resource simultaneously. Compared with OMA, NOMA not only increases the system's spectral and energy efficiency, but also supports more users.
