CDMA receiving apparatus

A code division multiplex access (CDMA) receiving apparatus, comprising:

• a plurality of reception processing sections individually including de-spreading sections for receiving a signal spread with a spread code and arriving through a plurality of paths as a reception signal and de-spreading the inputted reception signal with a de-spread code and channel estimation sections for estimating the paths based on results of the processing of said de-spreading sections;
• and
• a synchronization detection and phase tracking section for outputting reception delay amounts of the reception signal in a predetermined period to said de-spreading sections of said reception processing sections,
• each of said de-spreading sections including a plurality of correlators for individually correcting, when the reception delay amounts are received from said synchronization detection and phase tracking section, the reception delay amounts and performing de-spreading processing,
• each of said channel estimation sections including a plurality of level measurement sections for individually receiving a plurality of correlation magnitudes outputted from the corresponding plurality of correlators to measure levels of the correlation magnitudes, a level comparison section for comparing the measurement levels of said plurality of level measurement sections, a path change-over section for outputting the correlation magnitude of that one of the correlators which is detected to output the highest measurement level by said level comparison section as a reception signal from the path, a channel estimator for performing estimation of the path based on the correlation magnitude of the correlator selected by said path change-over section, and a detection section for correcting a symbol position of the reception signal based on the correlation magnitude selected by said path change-over section and an output of said channel estimator and outputting the corrected symbol position as detection data,
• wherein said plurality of correlators include a first correlator for performing de-spreading with a phase of a delay amount indicated by said synchronization detection and phase tracking section and outputting a resulting correlation value, a second correlator for performing de-spreading with a phase leading, where 1 bit of a spread code is represented by 1 chip, by 0.5 chips from the delay amount indicated by said synchronization detection and phase tracking section and outputting a resulting correlation value, a third correlator for performing de-spreading with a phase lagging by 0.5 chips from the delay amount indicated by said synchronization detection and phase tracking section and outputting a resulting correlation value, a fourth correlator for performing de-spreading with a phase leading by 0.25 chips from the delay amount indicated by said synchronization detection and phase tracking section and outputting a resulting correlation value, and a fifth correlator for performing de-spreading with a phase lagging by 0.25 chips from the delay amount indicated by said synchronization detection and phase tracking section and outputting a resulting correlation value.

A code division multiplex access (CDMA) receiving apparatus comprising:

• a plurality of reception processing sections individually including de-spreading sections for receiving a signal spread with a spread code and arriving through a plurality of paths as a reception signal and de-spreading the inputted reception signal with a de-spread code and channel estimation sections for estimating the paths based on results of the processing of said de-spreading sections;
• a synchronization detection and phase tracking section for outputting reception delay amounts of the reception signal in a predetermined period to said de-spreading sections of said reception processing sections,
• each of said de-spreading sections including a plurality of correlators for individually correcting, when the reception delay amounts are received from said synchronization detection and phase tracking section, the reception delay amounts and performing de-spreading processing,
• each of said channel estimation sections including a plurality of level measurement sections for individually receiving a plurality of correlation magnitudes outputted from the corresponding plurality of correlators to measure levels of the correlation magnitudes, a level comparison section for comparing the measurement levels of said plurality of level measurement sections, a path change-over section for outputting the correlation magnitude of that one of the correlators which is detected to output the highest measurement level by said level comparison section as a reception signal from the path, a channel estimator for performing estimation of the path based on the correlation magnitude of the correlator selected by said path change-over section, and a detection section for correcting a symbol position of the reception signal based on the correlation magnitude selected by said path change-over section and an output of said channel estimator and outputting the corrected symbol position as detection data;
• and
• a delay amount comparison section for comparing the reception delay amounts of the correlators selected by the path change-over sections of said plurality of reception processing sections and allowing, when a plurality of ones of the reception processing sections exhibit an equal reception delay amount, only one of the reception processing sections to perform reception processing.

A code division multiplex access (CDMA) receiving apparatus, comprising:

• a plurality of reception processing sections individually including de-spreading sections for receiving a signal spread with a spread code and arriving through a plurality of paths as a reception signal and de-spreading the inputted reception signal with a de-spread code and channel estimation sections for estimating the paths based on results of the processing of said de-spreading sections;
• a synchronization detection and phase tracking section for outputting reception delay amounts of the reception signal in a predetermined period to said de-spreading sections of said reception processing sections,
• each of said de-spreading sections including a plurality of correlators for individually correcting, when the reception delay amounts are received from said synchronization detection and phase tracking section, the reception delay amounts and performing de-spreading processing,
• each of said channel estimation sections including a plurality of level measurement sections for individually receiving a plurality of correlation magnitudes outputted from the corresponding plurality of correlators to measure levels of the correlation magnitudes, a level comparison section for comparing the measurement levels of said plurality of level measurement sections, a path change-over section for outputting the correlation magnitude of that one of the correlators which is detected to output the highest measurement level by said level comparison section as a reception signal from the path, a channel estimator for performing estimation of the path based on the correlation magnitude of the correlator selected by said path change-over section, and a detection section for correcting a symbol position of the reception signal based on the correlation magnitude selected by said path change-over section and an output of said channel estimator and outputting the corrected symbol position as detection data;
• and
• a delay amount comparison section for comparing the reception delay amounts of the correlators selected by the path change-over sections of said plurality of reception processing sections and allowing, when a plurality of ones of the reception processing sections exhibit an equal reception delay amount, only one of the reception processing sections to perform reception processing.

A code division multiplex access (CDMA) receiving apparatus, comprising:

• a plurality of reception processing sections, each of said plurality of reception processing sections including de-spreading sections for receiving a signal spread with a spread code and arriving through a plurality of paths as a reception signal and channel estimation sections for estimating the paths based on results of the processing of said de-spreading sections;
• and
• a synchronization detection and phase tracking section for outputting reception delay amounts of the reception signal in a predetermined period to said de-spreading sections,
• wherein each of said de-spreading sections includes a plurality of correlators for individually correcting the reception delay amounts and performing de-spreading processing, and
• wherein each of said channel estimation sections includes a plurality of level measurement sections for individually receiving a plurality of correlation magnitudes outputted from the corresponding plurality of correlators to measure levels of the correlation magnitudes,
• wherein each of said plurality of correlators performs de-spreading with a phase fixed in relation to a delay amount indicated by said synchronization detection and phase tracking section, said phase being fixed differently from a phase used by any other one of said plurality of correlators.

A code division multiplex access (CDMA) receiving apparatus, comprising:

• means for reception processing including de-spreading means for receiving a signal spread with a spread code and arriving through a plurality of paths as a reception signal and de-spreading the inputted reception signal with a de-spread code, and channel estimation means for estimating the paths based on results of the processing of said de-spreading means;
• and
• means for synchronization detection and phase tracking for outputting reception delay amounts of the reception signal in a predetermined period to said de-spreading means of said reception processing means,
• wherein said de-spreading means comprise a plurality of correlators for individually correcting, when the reception delay amounts are received from said synchronization detection and phase tracking means, the reception delay amounts and performing de-spreading processing, and
• wherein said channel estimation means comprises a plurality of level measurement sections for individually receiving a plurality of correlation magnitudes outputted from the corresponding plurality of correlators to measure levels of the correlation magnitudes,
• wherein each of said plurality of correlators performs de-spreading with a phase fixed in relation to a delay amount indicated by said synchronization detection and phase tracking means, said phase being fixed differently from a phase used by any other one of said plurality of correlators.