近年來，隨著無線網路的發展下，室內環境廣泛涵蓋著WI-FI網路，因為Wi-Fi網路具有低成本和容易實作之優點，所以許多人也投入研究Wi-Fi接收訊號強度(RSSI)的室內定位系統研究，由於RSSI容易受到障礙物的干擾而造成不穩定，故本篇論文提出了處理RSSI的穩定訊號演算法，使訊號可以在一個穩定的區間內，提供室內定位演算法穩定RSSI訊號，使其定位可以更佳的精準。
本篇論文主要在離線階段(Off-line)提出了穩定訊號演算法以及分佈訓練點方式，目的在於消除RSSI的雜訊並提供室內定位演算法精確的定位準確度，經過實驗證明，本論文提出的穩定訊號演算法可以消除RSSI訊號雜訊，使其可以在一個穩定的區間內，如此便可提供室內定位演算法一個穩定的離線環境。

As the rapid development of wireless internet network in recently years, a variety of positioning system has been proposed. Nowadays, indoor environment is widely covered with Wi-Fi networks. As a result of the existing infrastructures, Wi-Fi is low cost and implement easily. Many people devote themselves to Wi-Fi indoor positioning systems(IPSs) and techniques based on received signal strength(RSS) measurement from Wi-Fi access points. Comparing with outdoor, indoor environments are more complex. There are various obstacles, for example, walls, equipment, human beings, influencing the received signal strength values. Therefore, this paper proposes a stable algorithm to deal with RSSI so that signals can be located within a stable range. It can improve the accuracy and precision of positioning by using stable signal indoor positioning algorithm.
In off-line stage, this paper proposes a stable signal algorithm and a method to distribute the training nodes. This aims is to remove the RSSI noise and provide the more precise indoor positioning algorithm. The experiments show that the proposed method in this paper can remove RSSI signal noise, Signal can be located within a stable range, so it can provide a stable off-line environments for indoor positioning algorithm.

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