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This paper presents BER performances of OFDM/CDMA using combined frequency and time domain spreading (abbreviated as FT-CDMA). In the system, we employ a different frequency interleaver for each user and adaptive filters to suppress multiple access interference in an asynchronous multiple access system. In conventional MC-CDMA and MC-DS/CDMA systems, the… (More)
In a process of precision machining, corrosion of the surface of a precisely cut aluminum piece caused by bacteria was observed. A bacterium, Alcaligenes denitrificans, accumulated aluminum within the cell in granular form.