Method and apparatus for transmitting signals, and method and apparatus for receiving the signals
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United States of America Patent
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May 21, 2013
Grant Date -
Aug 18, 2011
app pub date -
Feb 2, 2011
filing date -
Jun 28, 2004
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Abstract
A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.
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