At the wireless router fields, there are many standards of modulation. And the most commonly used types are:
CCK
Complimentary Code Keying is a modulation scheme to operate in data speeds up to 11Mbps in the RF band.
QAM
Quadrature Amplitude Modulation, a dominant modulation technique for high
DSSS
Direct Sequence Spread Spectrum use wideband signals that are not easy to detect and resists jamming attempts speed digital signals.
OFDM
Orthogonal Frequency division multiplexing modulation is used for even higher speeds of 54Mbps.
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