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US 7,030,786 B2Granted
RFID readers and RFID tags communicating using extensible bit vectors
AssigneeImpinj, Inc.
InventorsDavid Kaplan, Christopher J. Diorio
Life of this patent
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Abstract
RFID system components, such as readers and tags, communicate by transmitting and receiving a wave that conveys a bit stream. Informing signals, such as special bits, are inserted in the stream between words. An informing signal indicates whether a certain word is the last word in the stream or not.
Claims37
A radio frequency identification (RFID) system component, comprising:
- an antenna that is arranged to receive a wave;
- a demodulator that is arranged to generate symbols from the wave;
- a mapper/decoder that is arranged to generate a stream of bits from the symbols;
- and
- a processing block that is arranged to:
- (a) isolate a group of the bits from the stream,
- (b) designate at least one of the isolated bits as an informing signal,
- (c) designate the remaining bits of the group as a word,
- (d) append the word to a previously similarly designated word for forming a reception block, and
- (e) if the informing signal does not equal a preset termination return to (a), else terminate appending and perform an action that uses the reception block as one of a memory address and content.
7 more elements
A method for a component of an RFID system comprising:
- (a) receiving a stream of bits;
- (b) isolating a group of the bits from the stream;
- (c) designating at least one of the isolated bits as an informing signal;
- (d) designating the remaining bits of the group of symbols as a word;
- (e) appending the word to a previously similarly designated word for forming a reception block;
- and
- (f) if the informing signal does not equal a preset termination returning to (b), else terminating appending and performing an action that uses the reception block as one of a memory address and content.
4 more elements
A radio frequency identification (RFID) system component, comprising:
- a processing circuit that is arranged to:
- retrieve a block of bits,
- isolate up to a word of the bits that occur sequentially in the block,
- append to a transmission stream the bits of the isolated word and at least one informing signal, wherein the informing signal equals a preset termination if the isolated bits are the last ones in the block, and does not equal the preset termination otherwise, and
- if there remain bits in the block that have not been isolated, return to isolating more of the bits, else forward the transmission stream for transmission;
- a mapper/encoder that is arranged to generate symbols from the transmission stream;
- a modulator that is arranged to modulate a wave with the symbols;
- and
- an antenna that is arranged to transmit the modulated wave.
6 more elements
A method for a component of an RFID system comprising:
- (a) retrieving a block of bits;
- (b) isolating a word of the bits that occur sequentially in the block;
- (c) appending to a transmission stream the bits of the isolated word and at least one informing signal, wherein the informing signal equals a preset termination if the isolated bits are the last ones in the block, and does not equal the preset termination otherwise;
- and
- (d) if there remain symbols in the block that have not been isolated, returning to (b), else transmitting a wave that conveys the transmission stream.
2 more elements
Dependencies are inferred from the claim text.