Transmission of acknowledge/not acknowledge (ACK/NACK) bits and their embedding in the reference signal
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United States of America Patent
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Oct 29, 2013
Grant Date -
Mar 27, 2008
app pub date -
Sep 20, 2007
filing date -
Sep 22, 2006
priority date (Note) -
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Abstract
Transmitting a acknowledge/not acknowledge (ACK/NACK) response in a wireless cellular network by mapping the data value into a cyclic shifted version of a reference signal. A subframe is formed with a plurality of symbols with certain symbols designated as reference signal (RS) symbols. The receiver and transmitter both know when an ACK/NACK response is expected. If an ACK/NACK response is not expected, then an RS is inserted in the duration of symbols designated as RS symbols. If an ACK/NACK response is expected, then the ACK/NACK response is embedded in one or more of the symbols designated as RS symbols. The subframe is transmitted to a receiver, and the receiver can determine the ACK/NACK value in the RS symbol, if present, and also use the RS symbol for coherent demodulation of a CQI (channel quality indicator) or data.
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