An improved novel D-P code algorithm of the indoor location

This paper proposes an advanced algorithm to improve the localization indoor called Digital-Piano Decoder Algorithm (D-PDA). Firstly, the paper proposals a high dynamic range (HDR) way to deal with hard identified pictures in a former version. And then the marker used in the algorithm is changed to benefit for the Digital-Piano Search Algorithm (D-PSA). Some experiments are done to show the efficiency. At last, error analysis is done to guide the modifications of the whole algorithm.