Radio frequency - Wikipedia

Radio frequency (RF) refers to an oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around twenty thousand times per second (7004200000000000000♠ 20 kHz) to around three hundred billion times per second (7011300000000000000♠ 300 GHz
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Radio frequency - Wikipedia

Re: Single frequency radio

Single-carrier FDMA - Wikipedia Single-carrier FDMA (SC-FDMA) is a frequency-division multiple access scheme. It is also called linearly precoded OFDMA (LP-OFDMA). Like other multiple access schemes (TDMA, FDMA, CDMA, OFDMA), it deals with the assignment of multiple users to a shared communication resource.