Software Defined Radio - DSSS CDMA

The Digilogic Direct Sequence Spread Spectrum Radio provides highly reliable communications with high resistance to interference and interception. The radio establishes a point to point communication link leveraging the spread spectrum and CDMA techniques. Prototyped based on the NI SDR Platform, the radio offers flexibility both in terms of hardware and software.

The radio consists of Radio Frequency (RF) transceiver, Field Programmable Gate Array (FPGA) for signal processing and a processor for data handling and user interface. Data to be transmitted is read by the radio over Ethernet interface irrespective of the protocol. The data is then processed and modulated in FPGA which is then transmitted through omni antenna. External Power Amplifier (PA) and Low Noise Amplifier (LNA) are used at transmitter and receiver respectively in order to amplify the signal. Received signal is demodulated and decoded on FPGA. Decoded data is transferred to subsystem over Ethernet interface. The radio provides full-duplex communication over a Line of Sight (LoS) range of 20km with Jamming to Signal ratio (J/S) of 21dB.

Highlights:

  • Direct-Sequence Spread Spectrum (DSSS) Technique
  • CDMA Architecture to achieve additional Processing Gain
  • BPSK/QPSK Modulation Shceme
  • Full-duplex Communication with FDD Mode
  • 2-Finger Rake Receiver for multipath mitigation
  • Up to 20 km Ling of Sight (LoS) Range
  • Up to 20 dB Jamming to Signal (J/S) Ratio
  • Built-in application for text messages and FTP

Specifications:

S.No.

Parameter

Specification

1

Frequency of Operation

200 MHz to 4.4 GHz

2

Bandwidth

Up to 40 MHz

3

Data Rate

Up to 300 kbps

4

Dynamic Range

70 dB

5

Sensitivity

-88 dBm

6

Modulation

CDMA with BPSK/QPSK

7

Spread Spectrum Technique

Direct-sequence

8

Communication Mode

FDD

9

Noise Figure

3 dB

10

Data Interface

Ethernet (Protocol Independent)

11

FEC

Convolutional Coding with rates of 1/2, 1/3, 1/4, 2/3, or 3/4

12

Output Power

Up to 10W

13

Line of Sight Range

Up to 10km

14

Antenna Type

Omni Directional

15

Jamming to Signal Ratio

20 dB

16

Operating Temperature

0o to 55oC

17

MIL Grade

JSS-55555

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