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This paper proposes a CCI-Based (Chip Correlation Indicator) link quality estimation mechanism for wireless sensor networks, which is used under the case of perceive packet loss. This mechanism studies on the relationship model between CCI and PRR (Packet Receive Rate) under the case of perceive packet loss, which is carried out on the foundation of doing analysis of the sending and receiving process of data frame and the factors which affect link quality. The building of the CCI-PRR relationship model is divided into two parts: the first is the building of CCI-SER (Symbol Error Rate) relationship model, and the second is the building of SER-PRR relationship model.
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