1. 後卓越進度報告 蔡育仁老師實驗室 2006/12/06

2. Distribute Source Coding (DSC) in WSNs Distributed source coding (DSC) is a data compression technique to reduce the redundancy without direct communication among sensor nodes. Sensors are encoders to individually encode their received information related to a single event.  E.g., Slepian-Wolf method is a widely used distributed source coding algorithm. … … … : received signal : Sensor : Sink Decoding Order

3. DSC with Random Access — Assumptions Performance of a DSC scheme in a slotted ALOHA WSN has been investigated.  Consider a cluster with N sensors and a sink. Node i transmit a packet in a slot with probability P i.  If the packet of node i corresponding to an event is received successfully, this node will not transmit other packets for this event again.  The packet of node i can be reconstructed if the packet of node 1 to node i–1 was received successfully.

4. Performance Evaluation Simulation Results Numerical Results Scenario I Scenario II Scenario III Scenario IV

5. Performance Evaluation Simulation Results Numerical Results Scenario I Scenario II Scenario III Scenario IV

6. Performance Evaluation Received Message Number of Interest Average Delay (Slots) β= 0 (Equal Prob.) β= 0.01 2-step type-I 2-step type-II 2-step type-III 2-step type-IV

7. DSC with Random Access — Future Work Adaptively adjust to improve the system performance. Extend to multicluster case with unknown cluster member.