Data and pilot mapping in an OFDM system
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United States of America Patent
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May 20, 2003
Grant Date -
N/A
app pub date -
Feb 16, 1999
filing date -
Feb 18, 1998
priority date (Note) -
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Abstract
The present invention relates to a wireless transmission method and a wireless transmission system using an OFDM system comprising a plurality of equally spaced subcarriers. According to the present invention a data and pilot mapping in an OFDM system is proposed. One timeslot thereby comprises two symbols S1, S2, which are OFDM-modulated and have the same time duration. Besides a short guard time and roll-off times, a midamble MA is introduced between the respectively two OFDM-modulated symbols. The time duration of the midamble thereby corresponds to 1/n of the time duration of the symbols S1, S2, n being an integer greater than 1. In case the midamble is also OFDM-modulated, only every n-th subcarrier of the OFDM system is modulated when transmitting the midamble MA. Alternatively the midamble can be transmitted using a single carrier modulation scheme. The midamble MA can be used to transmit pilot symbols for a channel estimation such as to provide a coherent detection. Alternatively or additionally the midamble can be used to transmit symbols to be used for a correlation technique such as to provide time and frequency synchronization of the transmission scheme.
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