| 摘要 |
<p>A known symbol received by an AFC is delayed one symbol by a delay line (101). The known symbol delayed by one symbol is subtracted from the received symbol by a subtracter (102). A delay line (103) receives the known symbol delayed by one symbol, and further delays it one symbol. The known symbol delayed by two symbols is subtracted from the received symbol by a subtracter (104). Phase detectors (105, 106) convert the results of the subtractions into phase angles, respectively, to detect phase deviations. Subtracters (108, 109) subtract phase offsets from the phase deviations. A multiplier (110) carries out a multiplication by 1/2. An averaging circuit (111) produces an average of the output from the subtracter (108) and the output from the multiplier (110) for a given period.</p> |
