1. A receiver for a real time locating system (RTLS), comprising: a down converter converting a signal into a base band signal; a matched filter matched-filtering the converted base band signal; an adaptive transversal filter (ATF) estimating an interference signal with an output of the matched filter, and filtering the output to remove interference of a heterogeneous signal of the same frequency band; a de-spreader multiplying an output of the ATF and a code according to direct sequence spread spectrum (DSSS) modulation used for spreading when a tag signal is modulated, and performing chip-matched filtering to obtain a value of correlation energy; and a detector detecting data from the correlation energy value.