LARGE SIGNAL NOISE CANCELLATION IN ELECTRONIC ARTICLE SURVEILLANCE

摘要

In an EAS system and method, a reference antenna is used to spatially separa te the interference and tag signal allowing the interference signal to be removed, which improves performance of the EAS receiver. The reference anten na is coupled to the system by an adaptive filter, which can be a software filt er that is continually adapting itself to optimum performance. The continuous adaptation obviates the need for manually tuning the coupling network and permits the system to perform at its optimum levle over long periods of time .