bidirectional_in-band_communication_in_the_qi_standard
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| bidirectional_in-band_communication_in_the_qi_standard [2025/05/01 12:50] – [Frequency Shift Keying] tm | bidirectional_in-band_communication_in_the_qi_standard [2025/05/01 12:52] (current) – [Amplitude Shift Keying] tm | ||
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| Frequency Shift Keying (FSK) is used to communicate transmitter data to the receiver. To output a binary one, the frequency of the carrier wave is boosted, while a binary 0 is equal to a lower frequency of the carrier wave. The protocol is applied via an oscillator within the transmitter that oscillates between the two frequencies. The principle behind FSK modulation is shown in Figure 1 and a practical representation of the oscillator can be found in Figure 2 (Ciciora et al., 2004, pp. 138–142; Crecraft & Gergely, 2002, p. 227). | Frequency Shift Keying (FSK) is used to communicate transmitter data to the receiver. To output a binary one, the frequency of the carrier wave is boosted, while a binary 0 is equal to a lower frequency of the carrier wave. The protocol is applied via an oscillator within the transmitter that oscillates between the two frequencies. The principle behind FSK modulation is shown in Figure 1 and a practical representation of the oscillator can be found in Figure 2 (Ciciora et al., 2004, pp. 138–142; Crecraft & Gergely, 2002, p. 227). | ||
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| | Figure 1 FSK modulation principle (Wells, n.d.) | Figure 2 Practical representation of FSK (Crecraft & Gergely, 2002, p. 227) | | | Figure 1 FSK modulation principle (Wells, n.d.) | Figure 2 Practical representation of FSK (Crecraft & Gergely, 2002, p. 227) | | ||
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| | Figure 3 ASK modulation principle | | Figure 3 ASK modulation principle | ||
| - | ASK is preferred for receiver-to-transmitter communication because it consumes less power compared to FSK modulation. Also, switching between two loads can also be easily and compactly integrated into the receiver hardware. | + | ASK is preferred for receiver-to-transmitter communication because it consumes less power compared to FSK modulation. Also, switching between two loads can be easily and compactly integrated into the receiver hardware. |
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