发明名称 |
Multi-standard transmitter system and method for a wireless communication system |
摘要 |
<p>A transmitter (108) converts a digital baseband signal input (150) for transmission by an antenna (114) to support multiple communication standards. An over-deviation phase multiplier (130) increases signal phase deviation by a factor of M. A digital phase modulator (176) applies trigonometric lookup tables. A digital intermediate frequency up-converter (132) up-shifts frequencies of desired signal content. First and second digital-to-analog converters (DACs) (134) and (136) use relatively low-bit operations, which add DAC noise (212). First and second low pass filters (138) and (140) apply rejection above frequencies of desired signal content. An analog I/Q modulator (142) converts from complex to real signals, adding an unwanted signal spaced from the desired signal content by an intermediate frequency multiple. A limiter (144) reduces amplitude modulated noise. An over-deviation phase divider (146) divides signal phase deviation by 1/M to reduce phase modulated noise.</p> |
申请公布号 |
EP2106083(A2) |
申请公布日期 |
2009.09.30 |
申请号 |
EP20090164033 |
申请日期 |
2003.02.04 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
MOLLENKOPF, STEVEN M.;SEE, ANDREW;WALKER, BRETT C. |
分类号 |
H04B1/04;H04L27/20 |
主分类号 |
H04B1/04 |
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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