Abstract

Methods and systems for coding SAW OFC devices to mitigate code collisions in a wireless multi-tag system. Each device producing plural stepped frequencies as an OFC signal with a chip offset delay to increase code diversity. A method for assigning a different OCF to each device includes using a matrix based on the number of OFCs needed and the number chips per code, populating each matrix cell with OFC chip, and assigning the codes from the matrix to the devices. The asynchronous passive multi-tag system includes plural surface acoustic wave devices each producing a different OFC signal having the same number of chips and including a chip offset time delay, an algorithm for assigning OFCs to each device, and a transceiver to transmit an interrogation signal and receive OFC signals in response with minimal code collisions during transmission.

Document Type

Patent

Patent Number

US 7,952,482

Application Serial Number

12/618,034

Issue Date

5-31-2011

Current Assignee

UCFRF

Assignee at Issuance

UCFRF

College

College of Engineering and Computer Science (CECS)

Department

Electrical Engineering & Computer Science - CS Division

Allowance Date

1-6-2011

Filing Date

11-13-2009

Assignee at Filing

UCFRF

Filing Type

Nonprovisional Application Record

Donated

no

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