Communication Theory as Applied to Wireless Sensor Networks

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Presentation transcript:

Communication Theory as Applied to Wireless Sensor Networks muse

Objectives Understand the constraints of WSN and how communication theory choices are influenced by them Understand the choice of digital over analog schemes Understand the choice of digital phase modulation methods over frequency or amplitude schemes muse

Objectives (cont.) Understand the cost/benefits of implementing source and channel coding for sensor networks Understand fundamental MAC concepts Grasp the importance of node synchronization Synthesize through examples these concepts to understand impact on energy and bandwidth requirements muse

Outline Sensor network constraints Digital modulation Source coding and Channel coding MAC Synchronization Synthesis: Energy and bandwidth requirements

WSN Communication Constraints Energy! Communication constraints

Data Collection Costs Sensors Activation Conditioning A/D Communication constraints

Computation Costs Node life support Simple data processing Censoring and Aggregation Source/Channel coding Communication constraints

Communication Costs Communication constraints

Putting it all together Communication constraints

Outline Sensor network constraints Digital modulation Source coding and Channel coding MAC Synchronization Synthesis: Energy and bandwidth requirements

Modulation Review Motivation for Digital Modulation

The Carrier Modulation

Amplitude Modulation (AM) DSB-SC (double sideband – suppressed carrier) Modulation

Frequency representation for DSB-SC (the math) Modulation

Frequency representation for DSB-SC (the cartoon) Modulation

Demodulation – coherent receiver

DSB-LC (or AM as we know it) Modulation

Frequency representation of DSB-LC Modulation

Amplitude Modulation Modulation

Frequency Modulation (FM)

Frequency Modulation Modulation

Phase Modulation Modulation

SNR Performance Modulation Fig. Lathi

Digital Methods Digital Modulation

Quadrature Modulation Digital Modulation

BPSK Digital Modulation

QPSK Digital Modulation

Constellation Plots Digital Modulation

BER Performance vs. Modulation Method Digital Modulation Fig. Lathi

BER Performance vs. Number of Symbols Digital Modulation Fig. Lathi

Outline Sensor network constraints Digital modulation Source coding and Channel coding MAC Synchronization Synthesis: Energy and bandwidth requirements