implementation of a fhss transceiver on an sdr
TRANSCRIPT
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