INTERFERENCE IMMUNE RADIO

摘要

An apparatus, system, and method for wireless communication with remote devices that reduce or eliminate interference from zero-mean noise and deterministic signals within the operating system frequency band are provided. An interrogator uses dithering of the initiation time of sequential transmitted signals or sets of transmitted signals with synchronous accumulation of the resulting received signals to reduce the relative strength of interfering signals while increasing the relative strength of the desired signal. The apparatus, system, and method are particularly advantageous when used to extract identification and/or sensor data from passive wireless sensors and tags.

主权项

1. A software defined radio:
wherein the radio receive chain implements direct to near-baseband subsampling; and wherein the digitized data from a set of N sequential synchronous pulses is summed to produce one output data set; and wherein each said digitized data set is collected according to a process including the steps of:
a transmit pulse is generated and transmitted at a specific time;the receive chain is inactive during the transmitted pulse and for a short defined time after completion of the transmit pulse;the receive chain is switched on at a defined time after the start of the transmitted pulse;digitized data is produced by sampling the received signal;digitized data from each received pulse is summed with stored data from prior pulses in said set of N pulses; andwherein a common clock or one or more signals derived therefrom is used to clock the transmit, receive, A/D conversion, and data accumulation processes, which with control signals ensures phase-synchronous operation from pulse to pulse.