基于相邻子信道差分的CSI定位算法

In recent years, with the growing popularity of the Wi-Fi devices，the need forlocation is growing,andindoor location technology has become a research hotpot. because of the convenient and low cost, the indoor location technology which are based on widely deployed Wi-Fi network is very popular.By measuring the RSSI (Received Signal Strength Indicator) in receiver to generate fingerprints to complete positioning. However, In the process of measurement, under the influence of time-varying and multipath effect, the results of final positioning results has certain errors. In this paper, We use CSI(the Channel State Information) which reflects the characteristics of the physical Channel to locate,Combining MIMO(Multiple Input Multiple Output) technology, Usingthe method which get the diff value between adjacent sub-channels to extract characteristic values and generate fingerprints, the results shows: with MIMO and difference between sub-channels 'method, location accuracy is better than the method using SISO(Single Input Single Output) or RSSI, the average accuracy is about 0.98m.