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Another Use for Stella

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Another use for STELLA would be to improve the intermodulation characteristics of an amplifier. Any time you transmit two carriers into a satellite, it is possible to have the satellite's transponser -- or any linear amplifier -- generate a large number or mixing products. Using a system such as STELLA, an error signal may be generated. This error signal would contain all of the carriers that are desired to be notched out of the signal, out of phase with the signal by 180-degrees, so that when the two signals are combined (or in the digital domain, complex multiplied), the resulting signal will be devoid of the extraneous carriers. A technique not unlike this is used in modern TV (OFDM) transmitters to restore linearity to the signal as the amplifier moves through non-linear points in the performance curve of the amplifier.

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