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Indoor positioning remains a challenging research area to be explored. Various kind of indoor positioning systems (IPSs) have been developed based on different techniques and technologies. Parameters such as distance, objects and location of access points can greatly affect the power of received signal strength. In this paper we discuss several existing IPSs and the techniques used with their unique strengths as well as its weaknesses. In addition, this paper elaborates the need of adaptive systems which can be the solution where other systems are unable to accomplish. Finally the reviewed techniques will be evaluated based on its complexity, accuracy and deployment cost to determine its capability in addressing issues in indoor wireless positioning.