Orthogonal frequency-division multiplexing (OFDM)

OFDM is a method of dividing a given bandwidth of frequency into smaller chunks, each of which can be independently and digitally modulated (e.g. BPSK, QPSK, QAM, ...[digital modulation techniques shall be covered in different tutorial]). It is known for being one of the most bandwidth efficient methods in communication system, which is why it has been implemented in 4G-LTE (4 generation Long Term Evolution) and WiMax. A defining characteritic of OFDM is the orthogonality of each of carriers. This feature (discussed below) allows for sending multiple modulated carriers at the same time without having to worry about mutual interference.