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Vol. 118, Issue 7, July 2010, pp.87-100

 

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Performance Analysis of CDMA Wireless Sensor Networks in Shadowed Environment

 

1U. DATTA, 2C. KUNDU, 3S. KUNDU

1, 2 Central Mechanical Engineering Research Institute (CSIR), Durgapur-713209, India

3 National Institute of Technology, Durgapur-713209, India

Tel.: ++91-343-6510253

E-mail:1uma_datta58@yahoo.in, 2chinmoy.kundu@gmail.com, 3sumit.kundu@nitdgp.ac.in

 

 

Received: 23 June 2010   /Accepted: 24 July 2010   /Published: 31 July 2010

 

Abstract: This paper evaluates the performance of a CDMA based wireless sensor networks (WSN) with layered architecture in terms of QoS like outage probability, bit error rate (BER), throughput, and delay, considering correlation amongst interferers in shadowed environment. Energy consumption for successful delivery of information is also evaluated at different channel conditions. Two kinds of interference namely multiple access interference (MAI) and node interference (NI) are considered and an infinite ARQ is assumed at link layer between a sending node and sink till successful transmission of packetized data. An appropriate analytical model of interference considering correlation amongst interferers, power control error and shadowing is developed for evaluating bit error rate (BER), packet error rate (PER), average number of retransmission for successful delivery of information, throughput, and delay in a single hop communication. A simple energy model is used for evaluating the consumption of energy for successful delivery of information between source and sink. We also evaluate the sink capacity of wireless CDMA sensor networks considering a threshold BER. Sink capacity is defined as the maximum number of sensor nodes transmitting concurrently to the sink and located within one hop layer. The impact of NI on the sink capacity is also indicated. The effects of node density, correlation amongst interferers and power control error (pce) on performance of WSN are investigated. Analytical results are supported by simulation results.

 

Keywords: Outage probability, Bit error rate, Sink capacity, Correlation, Power control

 

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