Wireless data transmission between base station and transponder with encoding/decoding parameter adjusted dependent on header symbol duration
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United States of America Patent
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May 20, 2008
Issued Date -
N/A
app pub date -
Jul 21, 2004
filing date -
Jul 23, 2003
priority date (Note) -
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Abstract
Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section containing at least a reference symbol, and a further section such as a data section. In the transponder, the time duration of the reference symbol is determined, and a parameter is adjusted dependent on the determined duration. The parameter determines at least a property, such as the time resolution, of the encoding and/or decoding operation, and may be the clock frequency of a counter circuit or the charging current of an RC-circuit used to determine the duration of the symbols. The parameter may initially be set to a minimum default value, which is increased if the determined duration is less than or equal to a specified threshold. Thereby, power consumption is minimized while ensuring reliable encoding and decoding over a large range of transmission distances.
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