What is Multi-Carrier Modulation?
Multi-carrier modulation (Multicarrier Modulation) uses multiple carrier signals. It divides the data stream into several sub-data streams, so that the sub-data stream has a much lower transmission bit rate, and uses these data to modulate several carriers respectively.
Multi-carrier modulation
Right!
- Chinese name
- Multi-carrier modulation
- Data transmission rate
- relatively low
- Diffuse
- Not sensitive to the time dispersion of the channel
- Application Principle
- Multiple carrier signals are used
- Multi-carrier modulation (Multicarrier Modulation) uses multiple carrier signals. It divides the data stream into several sub-data streams, so that the sub-data stream has a much lower transmission bit rate, and uses these data to modulate several carriers respectively.
- Therefore, in a multi-carrier modulation channel, the data transmission rate is relatively low and the symbol period is lengthened. As long as the delay spread is smaller than a certain ratio compared to the symbol period, no inter-symbol interference will be caused. Therefore, multi-carrier modulation is not sensitive to the time dispersion of the channel. Multi-carrier modulation can be achieved through multiple technical approaches, such as Multitone Realization, Orthogonal Multi-Carrier Modulation (OFDM), MC-CDMA, and Coded MCM. Among them, OFDM can resist multipath interference, which is a hot spot in current research.