| 摘要 |
PURPOSE: Coherent signal processing for CDMA communication system is provided to novel and improve method and apparatus for variable rate communication incorporating coherent signal processing. CONSTITUTION: Within receive system(100,102,106), vectors of in-phase and quadrature-phaseWalsh 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 vectors of in-phase and quadrature-phase values are projected on the in-phase and quadrature-phase reference values and weighted by the reference amplitude. 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. The coherently demodulated Walsh correlator outputs are used to form soft decis ions that are deinterleaved and soft-decis ion Viterbi decoded.
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