| 摘要 |
PROBLEM TO BE SOLVED: To relax the deterioration of signal quality by reducing probability that a peak power is instantaneously increased, and for measuring a normal interference power by carrier sense measurement in an OFDM system communication system using an adaptive array. SOLUTION: This communication system is provided with data preparation parts (11, 27) for mapping data by encoding data to be transmitted; a null symbol insertion part (12, 28) for, when the number of sub-channels including the mapped data is small with respect to band assignment, embedding a null symbol in the sub-channel including no data; and a symbol interleave part (13, 29) for performing symbol interleave to the whole user assignment band, and for inserting the already known training symbol and a pilot symbol into the determined symbol position of the user assignment band. The symbols are arranged so that signal phase change can be continued in the same sub-carrier between the plurality of symbols, and carrier sense is performed at the position of the symbol where the signal phase change is continued. COPYRIGHT: (C)2008,JPO&INPIT
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