What happens to sidebands when they enter negative frequencies?

1. What is the meaning of negative frequency in Fourier transform?
2. What are the sideband frequencies?
3. Do you need to have both sidebands in order to receive 100% of the information transmitted?
4. Which sidebands are ignored in FM?

What is the meaning of negative frequency in Fourier transform?

Also, Noteworthy is the point that a negative frequency is the rotation vector in the opposite direction to the positive frequency. For example it is necessary to have a real (non-complex) signal. Then we have two vectors rotating in opposite directions.

What are the sideband frequencies?

In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio signal. The sidebands comprise all the spectral components of the modulated signal except the carrier.

Do you need to have both sidebands in order to receive 100% of the information transmitted?

It is not necessary to transmit both sidebands plus the carrier, as a suitable receiver can extract the entire original signal from either the upper or lower sideband. There are several methods for eliminating the carrier and one sideband from the transmitted signal.

Which sidebands are ignored in FM?

For small values of modulation index, when using narrow-band FM, NBFM, radio communication systems, the signal consists of the carrier and the two sidebands spaced at the modulation frequency either side of the carrier. The sidebands further out are minimal and can be ignored.