Howtosignalprocessing
- What is subcarrier in OFDM?
- Which modulation is used in OFDM?
- What is OFDM and how it works?
- What are the main differences between OFDM and OFDMA?
What is subcarrier in OFDM?
Subcarriers in cellphones, LTE 4G and 5G NR
Cellphone data uses subcarriers in OFDM and OFDMA arrangements to transmit data from the base station to the handset. In LTE, each subcarrier is spaced 15 kHz apart. These subcarriers are combined in groups of 12 to form a single resource block.
Which modulation is used in OFDM?
Orthogonal Frequency Division Multiplexing (OFDM) is another widely used modulation method used to achieve high data rates and spectral efficiency. It is known as a multicarrier modulation method as many carriers are used instead of just one.
What is OFDM and how it works?
Orthogonal frequency-division multiplexing is a method of data transmission where a single information stream is split among several closely spaced narrowband subchannel frequencies instead of a single Wideband channel frequency.
What are the main differences between OFDM and OFDMA?
The difference is that OFDMA is multi-user where OFDM is single-user. It has 3x higher throughput than single-user OFDM for short packets of data or multiple endpoints. OFDMA combines transmissions and sends frames to multiple endpoints simultaneously. It is more efficient with lower latency transmission.
