发明名称 |
METHOD AND APPARATUS FOR MULTI-PHASE COMPONENT DOWNCONVERSION |
摘要 |
<p>The present invention provides a downconverter method and apparatus for downconverting a multiphase modulated signal. The downconverter can be implemented in a multi-phase receiver such as a quadrature receiver. An analog-to-digital converter (103) converts an intermediate frequency signal to a digital signal at a sampling rate. A Hilbert transformation filter (104) and a delay element (105) connected in parallel provide respective passband quadrature and in-phase components of the digital signal. A digital translator (107) alters the passband quadrature and in-phase components based on a predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal. The digital translator (107) can be a pseudorandom sequence demodulator for demodulating a code division multiple access (CDMA) signal. Various types of DC estimation can also be provided in addition to automatic gain control.</p> |
申请公布号 |
CA2153682(A1) |
申请公布日期 |
1995.06.08 |
申请号 |
CA19942153682 |
申请日期 |
1994.10.25 |
申请人 |
MOTOROLA, INC. |
发明人 |
LOVE, ROBERT TRISTAN;RAPALA, BRYAN;STEWART, KENNETH A. |
分类号 |
H04L27/22;H04B1/707;H04J13/04;H04L27/227;(IPC1-7):H04L27/00 |
主分类号 |
H04L27/22 |
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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