Introduction

In the field of wireless communication, the choice of modulation method is critical for signal transmission efficiency and anti-interference capability. OOK (On-Off Keying), ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase Shift Keying) are common digital modulation techniques. This article details their characteristics and application scenarios, combined with relevant product models from EBYTE.

What is OOK (On-Off Keying)?

OOK is the simplest modulation method, representing binary "1" and "0" through the presence or absence of a carrier signal. Its advantages include easy implementation and low cost, though it has weak anti-interference capability, making it suitable for low-speed, short-distance communication.

EBYTE Product Application:

  • E160-T4MS1: A 315MHz/433.92MHz wireless transmitter module using OOK/ASK modulation. Ideal for small household appliance remote controls and toy remotes, its OOK design ensures low power consumption and reliable performance.

    E160-T4MS1


What is ASK (Amplitude Shift Keying)?

ASK modulates binary information by varying the amplitude of the carrier signal. Compared to OOK, ASK supports higher data rates but remains sensitive to noise and interference.

EBYTE Product Application:

  • E160-R4MS1: A 315MHz/433.92MHz wireless receiver module compatible with OOK/ASK modulation. Used in Small appliances and toy remote control systems, ASK enables flexible signal processing at the receiver end, enhancing communication reliability.

E160-R4MS1

What is FSK (Frequency Shift Keying) ?

FSK encodes binary data by shifting the carrier frequency. It offers stronger anti-interference capability and higher data rates, making it suitable for medium-speed, medium-distance communication.

EBYTE Product Application:

  • E22-400M22S: 433MHz/470MHz wireless module based on LoRa™ technology, utilizing FSK modulation. With excellent anti-interference and long-range performance, it is widely applied in smart homes, wireless meter reading, scientific research, and medical fields.

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What is PSK (Phase Shift Keying) ?

PSK conveys information by adjusting the phase of the carrier signal. It delivers superior anti-interference capability and high data transmission rates, suitable for high-speed, long-distance communication.

EBYTE Product Application:

  • E32-900M30S: An 868MHz/915MHz wireless module based on LoRa™ technology, employing PSK modulation. Renowned for its exceptional anti-interference and long-range capabilities, it is used in smart homes, wireless alarm systems, and building automation solutions.


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Comparison of OOK, ASK, FSK, and PSK Modulation Methods

Characteristic

OOK (On-Off Keying)

ASK (Amplitude Shift Keying)

FSK (Frequency Shift Keying)

PSK (Phase Shift Keying)

Core Principle

Carrier presence ("1")/absence ("0")

Varying carrier amplitude for data bits

Varying carrier frequency for data bits

Varying carrier phase for data bits

Complexity

Simplest (lowest hardware cost)

Simple

Moderate

Highest

Data Rate

Low (<100 kbps)

Low to moderate (<500 kbps)

Moderate to high (kbps to Mbps)

High to very high (Mbps to Gbps)

Anti-Interference

Weak (sensitive to noise/attenuation)

Weak (similar to OOK)

Strong (resistant to amplitude noise)

Strongest (resistant to noise/phase jitter)

Power Efficiency

High (only transmits during "1")

Moderate

Moderate

Moderate to low

Typical Applications

Remote controls (toys/appliances), low-cost sensors

Low-speed IoT sensors, simple wireless links

Bluetooth, ZigBee, wireless meter reading

WiFi, 4G/5G, satellite communication, fiber optics

EBYTE Product Example

E160-TxMS1 (315MHz/433.92MHz transmitter)

E160-RxMS1 (315MHz/433.92MHz receiver)

E22-400M22S (LoRa-based 433MHz/470MHz module)

E32-900M30S (LoRa-based 868MHz/915MHz module)

Each modulation method has unique strengths and limitations, and selection depends on specific application requirements. EBYTE offers a diverse range of wireless modules covering OOK, ASK, FSK, and PSK, catering to user needs across scenarios—from low-speed, short-range remote controls to high-speed, long-distance industrial communication. EBYTE products consistently deliver reliable solutions for varied wireless communication demands.