Interactive wireless systems
The system works in two frequencies bands:
• 12.75-13.25 GHz – downstream signaling;
• 10.15-10.65 GHz – transfer of the upstream channels.
Each of these frequencies bands is divided into two strips 150 MHz wide, the protection interval between them is equal 200 MHz. For creation of prototypes it is offered to use for transfer only a strip of 12.75-12.9 GHz, and for reception – 10.15-10.3 GHz.
Division into two strips is caused by need of frequency division by transfer of the upstream channels in the next sectors therefore the bottom range is intended for transfer in odd sectors, and top – in even. Total quantity of sectors always is the even number.
Station parameters:
| Receiver parameters | Value |
|---|---|
| Receiver input working frequencies range, GHz | 12.75-12.9; 13.1-13.25 |
| Receiver output working frequencies range, GHz | 1.8-1.95 |
| Transmitter input frequencies range, MHz | 650-800 |
| Transmitter output frequencies range, GHz | 10.15-10.3; 10.5-10.65 |
| Local oscillator frequency, MHz | 10950; 11300 |
| Local oscillator frequency instability (is defined by a reference signal), ppm | +/–0.5 |
| Transmitter parameters | |
| Working frequencies range, GHz | 10.15-10.3; 10.5-10.65 |
| Output receiver dynamic range, dBm | –40...0 |
| Input transmitter dynamic range, dBm | –30...–10 |
| Transmitter nominal output level, dBm | 20 |
| Transmitter gain factor (without adjustment), dB | 50 |
| Adjustment range in the transmitter and the receiver, the dB, not less than | 34 |
| Reference signal level on transmitter input, dBm | –10...0 |
| Antenna parameters | |
| Gain factor, dBi: | |
| Option 1 (Cassegrain) | 33 |
| Option 2 (Horn) | 13 |
Subscriber`s device:
| Parameters | Value |
|---|---|
| Input downstream receiver frequencies range, MHz | 1800-1950 |
| Input CPE frequencies range, MHz | 14-42 |
| Output upstream transmitter frequencies range, MHz | 650-800 |
| Frequency deviation from nominal value, KHz, no more than | 5 |
For more information, please, read the article Interactive Wireless Systems.
United Wireless Multimedia System (UWMS)
United Wireless Multimedia System (UWMS) is intended for simultaneous providing both Internet and interactive TV services.
