Method of increasing noise immunity with a simulated preamble
First Claim
1. A method of receiving and processing a data stream without a preamble transmitted from a transmitting device in response to signals from an interrogation unit comprising the steps of:
- generated an internal simulated preamble signal by said interrogation unit subsequent to said signals;
transmitting a data stream from said transmitting device;
receiving said data stream at said interrogation unit;
averaging said simulated preamble signal and said received data stream to determine an initial averaged signal; and
providing said received data stream and said initial averaged signal as two inputs to a comparator.
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Accused Products
Abstract
Circuitry and method for receiving and decoding a data stream without a preamble transmitted from the transmitting device. The invention includes circuitry in the receiver or interrogation unit for generating a simulated preamble signal that is provided to the input of an averaging circuit and a comparator. The averaging circuitry then averages the simulated preamble signal and the actual received data signal to avoid loss of messages and information data at the front end of the received signal from a transponder.
11 Citations
17 Claims
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1. A method of receiving and processing a data stream without a preamble transmitted from a transmitting device in response to signals from an interrogation unit comprising the steps of:
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generated an internal simulated preamble signal by said interrogation unit subsequent to said signals;
transmitting a data stream from said transmitting device;
receiving said data stream at said interrogation unit;
averaging said simulated preamble signal and said received data stream to determine an initial averaged signal; and
providing said received data stream and said initial averaged signal as two inputs to a comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16)
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11. Apparatus adapted for receiving and processing a data stream without a preamble transmitted from a transmitting device in response to a power-up signal transmitted from an interrogation unit comprising:
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circuitry for generating a simulated preamble signal subsequent to the initial transmission of said power-up signal;
averaging circuitry having an input for receiving said simulated preamble signal and said received data stream and for providing an averaged signal as an output; and
a comparator for comparing said data stream and said average signal and for switching between two voltage levels as a function of the difference between said received coded data stream and said averaged signal. - View Dependent Claims (14, 17)
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Specification