QPSK Demodulator & Bit Synchronizer
The QPSK Demodulator and Bit Sync Unit has been designed to meet the Data Reception requirements for the Remote Sensing Satellite Ground Stations. This system receives a QPSK Modulated IF signal of 720 MHz as its input and output the Demodulated I and
Q base-band signals for the baseband data-rate upto 105 Mbps. The Bit Synchronizer receives the Demodulated I & Q base-band as it’s input and outputs the Clock and Synchronized Data for both I & Q with Parallel Clock
(52.5 MHz) and the serial data at 105 Mbps along with Serial Clock.
Applications
- In Radio communication for demodulation
- Orbiting satellite tracking for remote sensing
- High Data rate demodulators for ground checkout /Earth stations
- Digital Costas loop & DSP based processing
- QPSK Demodulation
- Data rate 10 Mbps to 105 Mbps (Upgradable to 320 Mbps)
- 60 dB dynamic range
- Configurable for different differential decoding algorithms
- Digital Bit-synchronizer (160Mbps- I & Q), Clock & Data Outputs
| Functional | |
|---|---|
| Input Frequency | 720 MHz |
| AGC Dynamic range | -10 to -50 dBm (40dB) |
| Demodulation Scheme | QPSK |
| Data Rate | Upto 105 Mbps (Upgradable to 320 Mbps) |
| Acquisition time | < 250msec |
| Acquisition range | ± 500 KHz |
| Doppler rate capability | up to 8 KHz/sec |
| BER Performance | Within 2.0dB of the theoretical Eb/No for a BER of 1x10-6 |
| Input Data Format | PCM NRZ-M |
| Differential Decoding | 4 state grays coded (I RS Specific) Programmable |
| Clock Acquisition | ±0.3% of Symbol rate |
| Outputs | I channel -Data, Clock, Inverted Clock, Inverted data, Q channel -Data, Clock, Inverted Clock & Inverted Data I+Q (Merged) Data & Clock |
| Output Logic | NRZ-L ECL Single ended (Un-terminated) |
| Clock Duty Cycle | 50% ±10% |
| Continuous Clock Stability | better than ± 10 PPM |
| Front Panel indication | Carrier, Clock lock & Local / Remote |
| Front Panel display | Frequency, RSSI, Data rate & Decoding |
| Front Panel selections | Decoding, Phase adjust, IP Configure |
| Input/output impedance | 50 ohms |
| Input/output connectors | BNC(F) |
| Remote Interface | RS232 I TCP/IP (Selectable) |
| Electrical | |
|---|---|
| Power | 230 VAC, 50 Hz, Single Phase |
| Mechanical | |
|---|---|
| Mounting | 19-inch 3U Rack mountable |
| Size | 485 L X 485 D X 88 H in mm |
| Weight | < 6Kg |
| Environmental | |
|---|---|
| Operational Temp | 0oC to +50oC |
| Temperature - Storage | -10oC to +60oC |
| Humidity | 90% RH Non-Condensing |
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