Timing-adjusting method and apparatus, and diversity receiving method and apparatus

A diversity receiving apparatus, comprising:

• a sampling unit which samples respectively a plurality of received signals at predetermined timings;
• a correlation processing unit which performs a correlation processing respectively on the plurality of sampled received signals by predetermined signals;
• a power computing unit which respectively computes power values of a main signal and sub-signals where one of the plurality of correlation-processed received signals is selected as the main signal and signals other than the main signal among the plurality of correlation-processed signals are the sub-signals;
• a detector which detects respectively a peak of the computed power value of the main signal and a peak of the computed power value of the sub-signals;
• an inter-signal condition determining unit which excludes, from signals on which diversity is to be performed, a received signal corresponding to a sub-signal if a relation of the detected peak of the power value of the main signal and the detected peak of the power value of a sub-signal does not satisfy a first condition;
• an intra-signal condition determining unit which compares the peak of the computed power value of the main signal and the peak of the computed power value of the sub-signals to a second condition, respectively, if a received signal corresponding to a sub-signal is not excluded from signals on which diversity is to be performed and which excludes, from signals on which diversity is to be performed, a signal corresponding to the main signal or a sub-signal if there is the main signal or a sub-signal that does not satisfy the second condition;
• a timing adjusting unit which adjusts the timing of a received signal, among the plurality of sampled received signals, corresponding to a sub-signal if received signals corresponding to the main signal and a sub-signal are not excluded from signals on which diversity is to be performed;
• and
• a diversity processing unit which performs a diversity processing on a received signal corresponding to the main signal and a timing-adjusted received signal, among the plurality of sampled received signals.

A timing adjusting method, comprising:

• sampling respectively a plurality of received signals at predetermined timings;
• performing a correlation processing respectively on the plurality of sampled received signals by predetermined signals;
• computing respectively power values of a main signal and sub-signals where one of the plurality of correlation-processed received signals is selected as the main signal and signals other than the main signal among the plurality of correlation-processed signals are the sub-signals;
• detecting respectively a peak of the computed power value of the main signal and a peak of the computed power value of the sub-signals;
• acquiring power values respectively corresponding to before and after the timing, from timing corresponding to the detected peak of the power value of the main signal, and acquiring power values respectively corresponding to before and after the timing, from timing corresponding to the detected peak of the power value of the sub-signals;
• deriving, based on the respective power values acquired by said acquiring, a first value indicating the degree of agreement between timings of the main signal and the sub-signals and a second value indicating the degree of variance between the timings of the main signal and the sub-signals;
• and
• shifting timing of received signals corresponding to the sub-signals, among the plurality of sampled received signals, based on the second value derived by said deriving if the derived second value is greater than the first value.

A diversity receiving method, comprising:

• sampling respectively a plurality of received signals at predetermined timings;
• performing a correlation processing respectively on the plurality of sampled received signals by predetermined signals;
• computing respectively power values of a main signal and sub-signals where one of the plurality of correlation-processed received signals is selected as the main signal and signals other than the main signal among the plurality of correlation-processed signals are the sub-signals;
• detecting respectively a peak of the computed power value of the main signal and a peak of the computed power value of the sub-signals;
• excluding, from signals on which diversity is to be performed, a received signal corresponding to a sub-signal if a relation of the detected peak of the power value of the main signal and the detected peak of the power value of a sub-signals does not satisfy a first condition;
• comparing the peak of the computed power value of the main signal and the peak of the computed power value of the sub-signals to a second condition, respectively, if a received signal corresponding to the sub-signal is not excluded, from signals on which diversity is to be performed, and excluding, from signals on which diversity is to be performed, a signal corresponding to the main signal or a sub-signal if there is the main signal or the sub-signal that does not satisfy the second condition;
• adjusting the timing of a received signal, among the plurality of sampled received signals, corresponding to a sub-signal if received signals corresponding to the main signal and the sub-signal are not excluded from signals on which diversity is to be performed;
• and
• performing a diversity processing on a received signal corresponding to the main signal and a timing-adjusted received signal, among the plurality of sampled received signals.