US 11,922,250 B2
Collaborative RFID reader using code divisional multiple access (CDMA) and methods for same
Edwin C. Kan, Ithaca, NY (US); and Xiaonan Hui, Ithaca, NY (US)
Assigned to Cornell University, Ithaca, NY (US)
Filed by Cornell University, Ithaca, NY (US)
Filed on Jun. 13, 2022, as Appl. No. 17/839,325.
Application 17/839,325 is a continuation of application No. 17/055,974, granted, now 11,392,782, previously published as PCT/US2019/032255, filed on May 14, 2019.
Claims priority of provisional application 62/671,405, filed on May 14, 2018.
Prior Publication US 2022/0318525 A1, Oct. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 7/10 (2006.01); G06K 19/07 (2006.01); H04B 5/00 (2006.01); H04B 7/216 (2006.01)
CPC G06K 7/10019 (2013.01) [G06K 19/0724 (2013.01); H04B 5/0031 (2013.01); H04B 5/0037 (2013.01); H04B 7/216 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A collaborative RFID reading system, comprising:
a plurality of RFID readers, each of the plurality of RFID readers comprising a transmitter, a receiver, a processing device, and a non-transient memory device bearing a unique orthogonal code assigned to the RFID reader and bearing unique orthogonal codes assigned to each of the other ones of the plurality of RFID readers,
wherein the transmitter of each of the plurality of RFID readers is synchronized to a first baseband frequency, and
wherein the processor of each of the plurality of RFID readers is programmed to:
encode data according to the unique orthogonal code assigned to the RFID reader to produce a CDMA-encoded signal characteristic of the RFID reader; and
broadcast the CDMA-encoded signal via the transmitter.