Wireless digital microwave transmission involves encoding video data through compression, then modulating it onto a digital microwave signal for wireless transmission via an antenna. At the receiving end, the signal is captured by the antenna, demodulated, and then decompressed to restore the original analog video signal. Additionally, after the microwave demodulation process, decoding software installed on a computer can further decompress the video, enabling features such as video recording, playback, management, cloud mirror control, and alarm monitoring. This makes the system highly versatile for various applications. But what are the common methods used in digital microwave transmission?
1. **Point-to-Point Transmission**: This method connects two fixed locations using a pair of digital microwave devices. The antennas must be positioned directly facing each other in an open area with no obstructions. It offers high transmission rates, typically up to 150 Mbps, making it ideal for long-distance communication where line-of-sight is maintained.
2. **Point-to-Multipoint Transmission**: In this setup, a central station receives signals from multiple remote terminals. It is commonly used for short-range wireless communication and is suitable for scenarios where several devices need to connect to a single hub, such as in surveillance systems or local area networks.
3. **Relay Mode Transmission**: When two points are not directly visible due to obstacles like buildings, a relay point can be used. For example, if there is a building C between points A and B, but both A-C and B-C have clear visibility, a relay device at point C can receive the signal from A and retransmit it to B. This method allows for extended coverage without requiring a direct line of sight between the original source and destination.
4. **Wireless Coverage**: This technique converts wired network signals into wireless format, allowing wireless devices to access the network. It is particularly useful for short-range coverage, such as in homes, offices, or small public areas.
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