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Interference and Sink Capacity of Wireless CDMA Sensor Networks with Layered Architecture
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- Authors
- Hyun Duk Kang, Heon Jin Hong, Seok Jin Sung, Ki Seon Kim
- Issue Date
- 2008-02
- Citation
- ETRI Journal, v.30, no.1, pp.13-20
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Project Code
- 06MR1300, Development of the basic spectrum resource utilizing technology, Kim Chang-Joo
- Abstract
- We evaluate the sink capacity of wireless code division multiple access (CDMA) sensor networks with layered architecture. We introduce a model of interference at a sink considering two kinds of interference: multiple access interference (MAI) and node interference (NI). We also investigate the activity of sensor nodes around the sink in relation to gathering data under a layered architecture. Based on the interference model and the activity of sensor nodes around the sink, we derive the failure probability of the transmission from a source node located one hop away from the sink using Gaussian approximation. Under the requirement of 1% failure probability of transmission, we determine the sink capacity, which is defined as the maximum number of concurrent sensor nodes located one hop away from the sink. We demonstrate that as the node activity of the MAI decreases, the variation of the sink capacity due to the node activity of the NI becomes more significant. The analysis results are verified through computer simulations.
- KSP Keywords
- Code division Multiple Access(CDMA), Computer simulation(MC and MD), Failure Probability, Gaussian approximation, Interference model, Multiple access interference(MAI), Sensor networks, Sensor node, Wireless CDMA, layered architecture