Using OPNET for performance evaluation of modified SSLE in sensor networks

This paper presents a modified sectoral sweeper based localization estimation (SSLE) method which is improved version of our previously proposed SSLE technique and it's modeling in OPNET. Simplified message formats are required by this technique. Only a central node estimates locations of sensor nodes, which needs to have smart antenna processing capability. The modified SSLE is modeled using OPNET modeler with log-normal shadowing effects. The present OPNET wireless module uses standard log-distance model without any shadowing effects. We add log-normal shadowing effects by providing an user with ability to choose shadowing effects from 0 dB to 5 dB according to the wireless environment. The detailed implementation methodology in OPNET is presented in terms of process models. The performance of modified SSLE is evaluated through different network and channel parameters in terms of localization error and average energy consuming.