Wireless digital microwave transmission involves encoding video data through compression, followed by modulation over a digital microwave channel. The signal is then transmitted via an antenna. On the receiving end, the process is reversed: the antenna captures the signal, the microwave signal is demodulated, and the video is decompressed to restore the original analog video signal. Additionally, after the microwave demodulation, decoding software is installed on a computer, allowing the video to be further processed, decompressed, and managed through software. This setup also enables functions such as video recording, playback, storage, cloud mirror control, and alarm management. But what are the common methods used in digital microwave transmission?
1. **Point-to-Point Transmission**
This method is used to connect two fixed locations that are far apart. It typically consists of a pair of digital microwave devices, with antennas placed directly facing each other in an open area. The distance between the two points must be clear of obstructions. Point-to-point transmission can achieve speeds up to 150 Mbps, making it ideal for high-quality video transmission over long distances.
2. **Point-to-Multipoint Transmission**
In this configuration, a central station receives signals from multiple remote terminals. It's commonly used for short-range wireless communication and is particularly useful in scenarios where several devices need to connect to a single base station.
3. **Relay Mode Transmission**
When there’s an obstacle between two points, such as a building, a relay mode can be used. For example, if point A and point B cannot see each other directly but both can see point C, a relay system can be set up at point C. A digital microwave device is installed at both A and B, while point C is equipped with both a receiver and a transmitter. The signal received at A is forwarded to B through the relay at C, enabling seamless communication between distant points.
4. **Wireless Coverage**
This method converts wired networks into wireless signals, allowing wireless devices to access the network. It is ideal for short-range wireless coverage, such as in offices or small campuses.
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