08-08-2012, 11:10 AM
Orthogonal frequency division multiplexing
[attachment=30494]
OFDM
OFDM is emerging as the preferred modulation scheme in modern high data rate wireless communication systems.
OFDM = FDM + orthogonal
Frequency division multiplexing (FDM) is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. Each signal travels within its own unique frequency range (carrier), which is modulated by the data (text, voice, video, etc.).
OFDM DEFINATION
OFDM is a special case of multi-carrier modulation. Multi-carrier modulation is the concept of splitting a signal into a number of signals, modulating each of these new signals to several frequency channels, and combining the data received on the multiple channels at the receiver. In OFDM, the multiple frequency channels,
known as sub-carriers, are orthogonal to each other. One of the principal advantages of OFDM is its utility for transmission at very nearly optimum performance in un equalized channels and in multi path channels
[attachment=30494]
OFDM
OFDM is emerging as the preferred modulation scheme in modern high data rate wireless communication systems.
OFDM = FDM + orthogonal
Frequency division multiplexing (FDM) is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. Each signal travels within its own unique frequency range (carrier), which is modulated by the data (text, voice, video, etc.).
OFDM DEFINATION
OFDM is a special case of multi-carrier modulation. Multi-carrier modulation is the concept of splitting a signal into a number of signals, modulating each of these new signals to several frequency channels, and combining the data received on the multiple channels at the receiver. In OFDM, the multiple frequency channels,
known as sub-carriers, are orthogonal to each other. One of the principal advantages of OFDM is its utility for transmission at very nearly optimum performance in un equalized channels and in multi path channels