发明名称 |
OFDM modulator and digital broadcasting apparatus using the same |
摘要 |
<p>An OFDM (Orthogonal Frequency Division Multiplexing) modulator of the present invention includes a polar coordinates converter to which real axis data and imaginary axis data output from a discrete inverse Fourier transformer are input. The converter converts the two kinds of input data to amplitude data to phase data. A carrier wave is subjected to phase modulation using the phase data and then input to a power amplifier as an input RF (Radio Frequency) signal. The power amplifier is implemented by a C class power amplifier having inherently high power utilization efficiency. The output level of the power amplifier is controlled in accordance with the amplitude data. <IMAGE></p> |
申请公布号 |
EP1037443(A2) |
申请公布日期 |
2000.09.20 |
申请号 |
EP20000105711 |
申请日期 |
2000.03.17 |
申请人 |
NEC CORPORATION |
发明人 |
MORI, NOBUYUKI;TAKEDA, HARUO |
分类号 |
H04L27/26;H04J11/00;H04L27/36;(IPC1-7):H04L27/36;H03C5/00 |
主分类号 |
H04L27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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