| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Research Abstract |
Because quadrature amplitude modulation (QAM) is applied to WLANs and cellular systems to obtain higher bit rates, an error vector magnitude (EVM) with less than 1% is strongly demanded. We can express local oscillator (LO) signals with phase and amplitude impairments in the complex signal domain. In a quadrature modulator, the negative-frequency component of the LO signal is an undesired one. Therefore, using a complex quadrature modulator and a complex filter, we can reduce an undesired radio frequency (RF) signal. Moreover, introducing a new LO-phase-error correction circuit, we can get EVMs of less than 1%. This modulator dissipates only 8.2 mW at a 1.2-V-power supply.
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