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Edge-assisted decorrelators are useful in realization of asynchronous CDMA reception with considerably low complexity and low detection delay. However the one-shot decorrelator, which is used to assist the signal detection in edgeassisted decorrelators, put constraint on the number of users that are supported. An edge assisted classical decorrelator (EACD) is reported in literature for improved performance against multiuser interference in asynchronous CDMA. In this paper a multistage partial parallel interference cancellation (PPIC) with an idea of one shot is proposed to use for edge estimations in EACD. The proposed scheme improves the performance and user capacity of EACD in asynchronous CDMA systems.

Data aggregation is the technique used togather the sensor data to reduce the duplicate data transmission. It is an effectual approach for Wireless Sensor Networks (WSNs) to save energy and prolong network life time. Existing Reliable Spatial Window Aggregation (RESA) query processing algorithm proposed to reduce packet loss rate during data communication and balance the load of nodes. The main problem in existing system is the single node act as the cluster head at every transmission so it takes more energy than the sensor nodes and the duplicate data can be stored at the cluster head. In order to address this problem, a Pattern Based Aggregation using query processing algorithm called PBA is proposed. PBA only requires each node to maintain location of its neighbours. According to the information it divides the query area into several sub regions followed by collection of sensor readings in each sub region. It is proposed to reduce the transmission of duplicate data during communication. An Oscilloscope measurement technique is proposed to measure the energy level of the sensor node.

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