Radio receiver
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United States of America Patent
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-
Aug 7, 2007
Grant Date -
Dec 25, 2003
app pub date -
Feb 12, 2003
filing date -
Mar 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A radio receiver handles a transmitted Walsh sequence having a code length of 'm' as a two-dimensional array of 'a' rows and 'b' columns, and performs a fast Hadamard transform process having a code length of 'a' in the row direction. The absolute values of the results are added in the column direction, and a Walsh number having the maximum receiving power is selected to determine a Walsh sequence having a code length of 'a.' Then, only the identified column is extracted, and a fast Hadamard transform process having a code length of 'b' is applied in the column direction.
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