| 摘要 |
<p>The apparatus includes a unit which detects a digitally encoded communications carrier signal having a waveform which defines two portions. An electrical signal is thus generated correspondent to the carrier signal. The signal has two phase segments, each phase segment corresponding to its respective portion of the carrier signal. Each phase segment also includes a respective noise portion. The apparatus determines a weighting factor based upon the respective noise portions of the two phase segments. Thereafter, at least one phase segment is weighted by the weighting factor. For example, the noisier phase segment can be attenuated by the weighting factor. A decoder can then identify the logic level of the signal based upon the two phase segments as weighted by the weighted factor.The apparatus can be used in receivers using avalanche photodetectors in an optical communications system.</p> |
