发明名称 |
Methods for recovering RFID data based upon probability using an RFID receiver |
摘要 |
RFID data signals from RFID tags may be recovered by determining the probabilities of transitions between data states between a series of a pairs of signal samples using a set of predetermined probabilities related to data, timing, baud rate and/or phase variables affecting the received signal and processing those determined probabilities to determine the sequence of such transitions that has the highest probability of occurrence. A second set of predetermined probabilities related to transitions in the opposite direction may be used to sequence in a reverse direction. The determination of the sequence representing the RFID tag data may be iterated in both directions until further iterations do not change the determined probabilities. |
申请公布号 |
US9613236(B2) |
申请公布日期 |
2017.04.04 |
申请号 |
US201414571030 |
申请日期 |
2014.12.15 |
申请人 |
Mojix, Inc. |
发明人 |
Sadr Ramin |
分类号 |
G06K7/10;G06K7/00;H03M13/29;H03M13/39;H03M13/00;H04L1/00;H04L1/08;H04L25/02;H04L25/03;H04L25/06;H04L27/02;H04L27/10;G06K7/01;H03M13/09 |
主分类号 |
G06K7/10 |
代理机构 |
KPPB LLP |
代理人 |
KPPB LLP |
主权项 |
1. An adaptive noncoherent receiver for recovering RFID data transmitted over a communication channel comprising:
a converter configured to receive a phase modulated input signal and convert the received input signal into a vector representation by sampling the received input signal; a channel equalizer comprising a filter bank, where the channel equalizer is configured to cancel interference associated with the communication channel by filtering the received input signal utilizing the filter bank and generate a first output signal; a phase rotator configured to receive the first output signal and rotate the phase of the first output signal to generate a second output signal; wherein the receiver further comprises a non-coherent estimation unit configured to receive the second output signal and generate a soft metric estimation; wherein the non-coherent estimation unit is updated based upon feedback from a noncoherent soft-input-soft-out (SISO) decoder; wherein the SISO decoder is updated utilizing the soft metric estimation; wherein the SISO decoder is iteratively updated; and a channel estimation unit configured to estimate a channel impulse response of the communication channel and update the filter bank. |
地址 |
Los Angeles CA US |