Traditional systems use time and/or frequency multiplexing
to enhance throughput, but are spectrally wasteful because they can't transmit/receive simultaneously.
Orthogonal Frequency multiplexing
modulation (OFDM) symbol with [K.sub.0] = 128 subcarriers is used to generate preamble.
The frequency multiplexing technology is used to remove environmental stable interference sources like ambient light, power line, and 1/f noise generated by the electronics.
To distinguish mixed light sources from multiple emitters around the detector, time and frequency multiplexing methods are commonly used in CW-fNIRS system.
Wide-Band Orthogonal Frequency Multiplexing
(WOFDM), WiLAN, 2000.
Chapter 7 covers orthogonal frequency multiplexing
(OFDM) and multi-carrier CDMA.
Some of the important EMC and efficiency factors associated with a multifunction system having combined time and frequency multiplexing capabilities are: * Frequency multiplexing can improve EMC as well as multifunction waveform simultaneity performance.
As noted in this article, frequency multiplexing within a multifunction AEA system is hardware intensive and this introduces many new issues such as high packaging density, cost impact, etc.
Quasi-optical frequency multiplexing
is chosen over other techniques at mm-wavelengths because it has the advantages of low loss, very wide bandwidths, co-boresighted beams and multiple polarization capability.