Implementation of a FHSS transceiver on an SDR platform

If I have seen further it is only by standing on the shoulders of giants

SDR platform

RF

moduleData conv

module

DSP

module

Specs of an SDR platform

DSP Module:

oDSP CPU clock 594 MHz

oARM CPU clock 297 MHz

oNAND flash memory 128 MB

oDDR2 SDRAM 128 MB

oFPGA Virtex IV

Specs of an SDR platform

Data Conv Module:

– DC specs:

• Input channels 2

• Input channels resolution 14 bit

• Out put channels 2

• Output channel resolution 16 bit

– AC specs:

• Acquisition Sample Rate 125Msps

• Acquisition Bandwidth 150Mhz

• Transmission Sample Rate 500Msps

Specs of an SDR platform

RF Module:

– Receiver

• Frequency range 30Mhz to 900Mhz

• Switching speed 240us to 420us

• Minimum Detectable signal -102dbm

– Transmitter

• Frequency Range 200Mhz to 930Mhz

• Synthesizer Freq Range 500MHz to 930Mhz

• Switching speed 240us to 420us

FHSS on the SDR board

Transmitter:

Data Acq ModulationFrequency Hopping

Up Sampling

Up Conversion

to IF

DACUp

Conversion to RF

TxAntenna

Data ConvRF Module

Down Conversion

from IF

FHSS on the SDR board

Rx Antenna

ADC

De-hopping

Demodulation

Received Data

Down Sampling

Down Conversion

to IF

Data ConvRF Module

Receiver:

DM6446 Virtex-4 SX35 FPGAData Conversion

Expansion Connector

FPGA Virtex-4

ADC

Data Conversion Expansion Connector

RF Out

Tx Antenna

RF In

Rx Antenna

IF Out IF In

VPSS

DAC

PCM codecs

Hardware Flow Diagram

Synchronization

Pilot Signal PN Sequence Data

Technical Challenges

DM6446Modulation

SchemeComputational

EfficiencyVirtex-4 SX35

FPGAVPSS

4 MSPs

DAC

LYRIO 125 MSPs

Up SamplingNon-integer Up sampling

factor

Buffer Length=2^x

Less powerful ADC

RF module

Switching Speed 240us

Less powerful ADC

Synchronization

Conclusions

Successful Simulation of the FHSS system on Matlab

Successful Implementation of an FSK transceiver on a Spartan III kit

Successful Implementation of a test bench that could take any waveform and implement it

– Successful Implementation of an FHSS transceiver on the SDR platform

– A real time audio transceiver on the SDR platform with FSK

– A real time audio transceiver on the SDR platform with PSK

Recommendations

Comparison of a large number of modulation schemes on the developed test bench

Source Coding and Channel Coding Algorithms

Multi-node Communication

Questions