Patent Application
20090040047
The present disclosure relates to RFID systems and, more particularly, to a system and method for improving the performance of the RFID systems.
The advantages and features of the present disclosure will become better understood with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, wherein like elements are identified with like symbols, and in which:
Like reference numerals refer to like parts throughout the description of several views of the drawings.
For a thorough understanding of the present disclosure, refer to the following detailed description, including the appended claims, in connection with the above-described drawings. Although the present disclosure is described in connection with exemplary embodiments, the disclosure is not intended to be limited to the specific forms set forth herein. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but these are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present disclosure. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
The terms “first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
In one embodiment of the present disclosure, the bit rate generator 208 comprises a finite state machine (not shown in
The transmitter circuit 204 transmits the signal representative of the time gap to the tags 104. The receiver circuit 206 is configured to receive the successive responses from each of the tags. In one embodiment of the present disclosure, the transmitter circuit 204 and the receiver circuit 206 use an antenna 212 to communicate with the tags 104. The functioning of the tags 104 is explained further in conjunction with
The control logic 304 fetches the signal representative of the time gap as input from the transceiver 302. The control logic 304 generates a control signal in response to the signal representative of the time gap. The control signal is fed to the timing circuitry 306. The timing circuitry 306 broadcasts a pulse containing information about the ID of the RFID tag 104 in a periodic manner to the reader 102. The duty cycle of the pulse may be varied based on the control signal. In other words, the time gap between the successive responses of the RFID tag 104 to the reader 102 may be varied based on the control signal, which in turn, depends upon the signal representative of the time gap. The timing circuit 306 takes the ID of the RFID tag 104 from the memory 308, which stores the ID of the RFID tag 104. The memory 308 may also include other information including, but not limited to, price of a commodity onto which the tag is attached, the security codes related to the commodity, type and nature of the commodity and the placement of the commodity.
The communication between the reader 102 and the tags 104 in the RFID system 100 may also be explained by the following method. The method of communication in the RFID system comprises generating a signal representative of a time gap required in the successive responses of each tag (of the plurality of tags) to the RFID readers. The signal representative of the time gap is generated at the RFID reader. This signal is generated based on the number of tags that are present in the FOV of the RFID reader. For example, with reference to
The foregoing descriptions of specific embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical application, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present disclosure.
