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BPSK RF Receiver. Team 10 Michael Russell Shawn Kuo Amit Patel. Objective. Successfully demodulate BPSK data sent at RF from one DSP to another Demonstrate feasibility of programmable back-end receiver Develop future tool for DSP lab. End-user Benefits.

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bpsk rf receiver

BPSK RF Receiver

Team 10

Michael Russell

Shawn Kuo

Amit Patel

objective
Objective
  • Successfully demodulate BPSK data sent at RF from one DSP to another
  • Demonstrate feasibility of programmable back-end receiver
  • Develop future tool for DSP lab
end user benefits
End-user Benefits
  • A quick and simple point-to-point digital communication solution
  • Scalable module that is capable of handling multiple demodulation schemes without hardware redesign
  • Capable of receiving over a large frequency range
software implementation
Software Implementation
  • Differential BPSK
    • Pi-Radian Ambiguity
    • Symbol Quantization and Unmapping
  • Phase-Locked Loop
    • Carrier Recovery
    • Coherent Detection
  • Symbol Timing
simulation results
Simulation Results

Generated BPSK Waveform

Received BPSK Waveform

measured signals
Measured Signals
  • Transmitted signal
  • Signal after preselector
  • Signal after mixing (baseband)
  • Unfiltered DDS signal (LO)
  • Filtered DDS signal
output interface
Output Interface
  • Write decoded characters to memory and serial port simultaneously
  • Interact with serial port through Tera Term
theoretical probability of error

Q

I

Symbol B

Symbol A

Q

I

Symbol B

Symbol A

Theoretical Probability of Error

Constellation

Constellation w/Noise

theoretical probability of error1

Received Symbol:

Q

I

Symbol B

Symbol A

Theoretical Probability of Error

Mapping

Result: Q(sqrt(2*Energy/Noise)) or Q(sqrt(2*SNR))

calculating snr
Calculating SNR

The SNR was calculated by measuring separately

measuring the signal power and the noise power

after the preselector filter.

calculated probability of error
Calculated Byte Error (upper bound)

Took 125KB of data

Accurate for large amounts of noise

Good order of magnitude approximation for low noise

Calculated Probability of Error
tolerance of pll
Variation in Frequency

Drifting in DDS

Temperature

Result

Tolerance of PLL
successes
Successes
  • Demodulated BPSK data sent at RF from one DSP to another
  • Demonstrated feasibility of programmable back-end receiver
  • Breadboard design produced expected behavior
challenges
Challenges
  • Transmitting BPSK signal at RF
    • Used passive mixer and DDS
    • Used coaxial channel instead of air
  • Bandlimiting Signal
    • Use of Narrow Bandwidth Crystal Filter
    • Matching Network
  • Working around Serial Port interrupts
future developments rev1 1
Future Developments Rev1.1
  • Solve Serial Port Issues for live data
  • Printed Circuit Board
  • Add Faster A/D
  • Implement more Demodulation Schemes