| 摘要 |
<p>The invention describes a method and device (4) that compensate sampling instant errors in digital receivers. For improving performance in a cellular communication system, such as WCDMA, information from the path delay estimator (44) is used for improving the robustness of a sampling adjustment. The received signal y(t) is downconverted (42) and sampled, yielding a digital baseband signal yn. The digital baseband signal yn is then, directly or after an oversampling, fed to a path delay estimator (44), which provides information about the power delay profile (PDP). By using knowledge of the receiver filters and the transmitter filters used in the communication system and of the PDP, the optimal sampling instant is computed and sampling instants are adjusted. Thus the receiver performance in high-performance modes such as HSDPA in WCDMA is enhanced, while a moderate sampling rate and power consumption are maintained. According to the invention, a matched-filtering-based peak instant detection improves the robustness and additionally allows computing a metric indication that indicates whether the timing adjustment is advisable in an observed situation. Additionally, the invention is used in sampling timing selection based on either ADC clock adjustment or downsampling phase selection. <IMAGE></p> |
