| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In this research, we have studied a transmission scheme to obtain a diversity gain in orthogonal frequency division multiplexing (OFDM) systems using spatial multiplexing (SM) transmission. We have proposed mutual superposition transmission (MST) in order to realize reliable SM-OFDM systems without reducing the transmission speed. In addition, we have proposed modified MST (MMST) to reduce the computational complexity required for demodulation. In the proposed MST, two data symbols of two different subcarriers are mutually superposed on respective subcarriers after being weighted. Since each of superposed symbols contains two data symbols and is transmitted on each subcarrier, a diversity gain is obtained at a receiver. As a result, we have demonstrated that the proposed MST and MMST achieve reliable SM transmission without reducing the transmission speed.
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