1. The exact data capacity per channel depends on the modulation method used. 2. A modulation method specifies how the radio signal fluctuates to convey information. 3. AM was the earliest modulation method used to transmit voice by radio. 4. This was quickly supplanted by digital modulation methods to achieve even greater spectral efficiency. 5. Non-coherent modulation methods do not require a receiver reference clock signal that is asynchronously transferred. 6. "' 8VSB "'is the modulation method used for broadcast in the ATSC digital television standard. 7. However, ISO / IEC 18092 ( Near Field Communication ) uses some similar modulation methods . 8. Moreover, it goes on to define four physical layers depending on the modulation method used. 9. OFDM is a frequency-division multiplexing ( FDM ) scheme used as a digital multi-carrier modulation method . 10. Triangulations from this angle gave results for the height of reflection compatible with the frequency modulation method .
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