Radio transmitting apparatus, radio receiving apparatus, and radio transmission method
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United States of America Patent
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Jan 29, 2013
Grant Date -
Jan 14, 2010
app pub date -
Sep 16, 2009
filing date -
Nov 26, 2001
priority date (Note) -
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Abstract
The degree of multiplexing of a code division multiplexed signal transmitted by subcarriers is selected on a subcarrier-by-subcarrier basis. As a result, inter-code interference on the propagation path and degradation on the propagation path are lower for a code division multiplexed signal allocated to subcarriers with a low degree of signal multiplexing (G1) than for transmit signals allocated to subcarriers with a high degree of multiplexing. By this technique, it is possible to prevent degradation of the error rate characteristics of important information without lowering spectral efficiency significantly as compared with the case in which the degree of signal multiplexing is decided uniformly for all subcarriers, and to achieve compatibility between spectral efficiency and error rate characteristics.
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