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This modulation modulation
was the basis for all long distance telephone communications up until the
last decade. It was called "L carrier." It consisted of groups of telephone
conversations modulated on upper and/or lower sidebands of contiguous suppressed
carriers. The groupings and sideband orientations (USB, LSB) supported
hundreds and thousands of individual telephone conversations.
was used by theU.S.
Air force's Strategic Air Command (SAC)
to insure reliable communications between their nuclear bombers and NORAD.
In fact, before satellite communications SSB-was
the only reliable form of communications with the bombers.
the carrier is not transmitted, there is a reduction by 50% of the transmitted power (-3dBm).
in SSB, only
one sideband is transmitted, there is a further reduction
by 50% in transmitted power (-3dBm (+) -3dBm = -6dBm).
because only one sideband is received, the receiver's needed bandwidth is reduced by one half--thus effectively reducing the
required power by the transmitter another 50% (-3dBm (+) -3dBm (+) -3dBm