Transmission signal formation method, communication method, and transmission signal data structure
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United States of America Patent
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Issued Date -
Nov 3, 2005
app pub date -
Feb 28, 2005
filing date -
Aug 30, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A coefficient sequence of a spreading sequence is sequentially shifted one pitch at a time, transmission data is multiplied by a plurality of coefficient sequences to produce a plurality of transmission data, and the plurality of produced transmission data are added up to produce a transmission data sequence. Alternatively, the coefficient sequence of the spreading sequence is multiplied by the transmission data, the result is sequentially shifted one pitch at a time, and a plurality of transmission data are added up to produce a transmission data sequence. Transmission data is multiplied by the coefficient sequence of a spreading sequence to produce a finite-length signal and this finite-length signal is repeated an infinite number of times to produce an infinite-length signal. Transmission data, which is longer than the coefficient sequence, is cut out from this infinite-length signal to produce a transmission data sequence. This makes it possible to include transmission data into a spreading sequence and, therefore, when the transmission data is modulated through spread spectrum, an increase in the amplitude of a signal is reduced and the dynamic range of an amplifier on the receiving side is reduced.
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