发明名称 |
Coherent signal processing for cdma communication system |
摘要 |
A method and apparatus for variable rate communication incorporating coherent signal processing and combining is described. Within the receive system, vectors of in-phase and quadrature-phase Walsh correlator output values are generated for each Rake finger over each Walsh symbol period. In-phase and quadrature-phase reference values are generated for each of the Rake fingers by combining the in-phase and quadrature-phase correlator outputs of the most likely Walsh symbols over a series of Walsh symbol periods. The output energies are calculated as the sum of squared in-phase and quadrature-phase values. The vectors of in-phase and quadrature-phases values are then projected on the in-phase and quadrature-phase reference values and weighted by the reference amplitude. The reference amplitude is the square root of the sum of squared in-phase and quadrature-phase values. The vectors of projected and weighted values are summed via coherently combining, and the corresponding values from the other Rake fingers used to obtain a resultant vector of coherently demodulated Walsh correlator outputs. |
申请公布号 |
AU3741397(A) |
申请公布日期 |
1998.02.20 |
申请号 |
AU19970037413 |
申请日期 |
1997.07.29 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
EPHRAIM ZEHAVI;SERGE WILLENEGGER;JOSEPH P ODENWALDER |
分类号 |
H04B1/709;H04B1/7115;H04B7/26 |
主分类号 |
H04B1/709 |
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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