Patent ID: 7734994

Claim:
A radio frequency identification (RFID) decoding subsystem comprises: pre-decode module coupled to process down-converted RFID signals into pre-decoded baseband data and corresponding decoding information, wherein the pre-decoded baseband data includes limited in-phase component signals of the down-converted RFID signals and limited quadrature component signals of the down-converted RFID signals, and wherein the corresponding decoding information includes signal strength of filtered quadrature components and signal strength of filtered in-phase components; and decode module coupled to process the pre-decoded baseband data into decoded RFID data, wherein the processing of the pre-decoded baseband data is based on the corresponding decoding information, wherein the decode module processes the pre-decoded baseband data by: decoding the limited in-phase component signals to produce decoded in-phase RFID data; decoding the limited quadrature component signals to produce decoded quadrature RFID data; and selecting the decoded in-phase RFID data or the decoded quadrature RFID data as the decoded RFID data based on the least one of the signal strength of the filtered quadrature components and the signal strength of the filtered in-phase components.