US 8,798,118 B2 · Receiver for real time locating system and method of receiving signal in real time locating system

Abstract

Provided are a receiver for a real time locating system (RTLS) and a method of receiving a signal in the RTLS. The receiver includes a down converter converting a radio frequency (RF) signal into a base band signal, a matched filter filtering the converted signal using an optimal receiving filter in view of a signal-to-noise ratio (SNR) such as a shaping filter used for a transmitter, 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 matched filter and a code according to 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 original transmission data using the correlation energy value.

Claims7

Dependent claims

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 on the output from the ATF and obtaining a value of correlation energy through a de-spreading process;
and
a detector detecting transmission data using the correlation energy value, where the filtering is implemented according to a weight generated in correspondence with the interference signal estimated and an input value, and the signal is demodulated using the code.

3 more elements

A method of receiving a signal in a real time locating system (RTLS), comprising:

converting the signal into a base band signal;
matched-filtering the converted base band signal to be matched at a transmitter;
estimating an interference signal with the matched-filtered signal, and filtering the matched-filtered signal to remove interference of a heterogeneous signal of the same frequency band;
and
de-spreading the signal from which the interference is removed according to direct sequence spread spectrum (DSSS) modulation of a code used for spreading when a tag signal is modulated to detect transmission data, where the filtering is implemented according to a weight generated in correspondence with the interference signal estimated and an input value and the signal is demodulated using the code.

2 more elements

Dependencies are inferred from the claim text.

Receiver for real time locating system and method of receiving signal in real time locating system

Life of this patent

Receiver for real time locating system and method of receiving signal in real time locating system

Life of this patent

Abstract

Claims7