The RSSI-based location is easy to be affected by multipath interference in wireless sensor networks. The traditional
RSSI-based location methods usually increase the number of samples to resist multipath interference while few works
done on physical layer. In this paper, we study to separate subchip multipath components for RSSI-based location
application, the direct path can be separated among multipath by despreaded using the first sample of each chip, after
calculating the direct path’s power we can get the anti-multipath interference’s RSSI value. The theoretical analysis of
the performance of separating subchip multipath, signal-to-noise(SNR) losses are presented. Finally, the simulation and
experiment show the variance of RSSI value calculated by the traditional method and the proposal in this paper, the
proposed method achieves better performance than the traditional method under multipath channel environment.