Patent ID: 7952482
Filing Date: 2011-05-31
Classification: G06K

Abstract:
1. A method to mitigate code collisions in a wireless multi-tag system, each one of the OFC surface acoustic wave devices generating an orthogonal frequency coded signal for identification, the method comprising the steps of: determining a M by N code matrix dimension based on the number of orthogonal frequency codes needed M and the number of locations chips can populate N, each row corresponding to one surface acoustic wave device orthogonal frequency code and each cell in each row corresponding to one orthogonal chip and the chips are orthogonal to each other at their respective center frequencies; populating each cell of the matrix with one of the orthogonal frequency chips with a different one of the orthogonal frequencies in each cell in each column; and applying one of the resulting codes from the populated matrix to each one of the surface acoustic wave OFC devices in the multi-tag system.