Radio communication apparatus used in CDMA communication system, which has fingers and is designed to perform rake reception, and power consumption control method therefor

Abstract

A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, includes a delay profile calculating section and a finger path allocating section. The delay profile calculating section calculates a delay profile using a reception signal. The finger path allocating section allocates path positions to the plurality of fingers on the basis of the delay profile calculated by the delay profile calculating section. A delay profile calculation cycle in the delay profile calculating section is variable. A power consumption control method is also disclosed.

1 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, comprising: 
 a delay profile calculating section for calculating a delay profile using a reception signal; and    a finger path allocating section for allocating path positions to said plurality of fingers on the basis of the delay profile calculated by said delay profile calculating section,    wherein a delay profile calculation cycle in said delay profile calculating section is variable.    
     
     
         2 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, comprising: 
 a delay profile calculating section for calculating a delay profile using a reception signal;    a finger path allocating section for allocating path positions to said plurality of fingers on the basis of the delay profile calculated by said delay profile calculating section;    a reception characteristic detecting section for detecting reception characteristics of the reception signal; and    a delay profile calculation control section for controlling a delay profile calculation cycle in said delay profile calculating section on the basis of the reception characteristics detected by said reception characteristic detecting section.    
     
     
         3 . An apparatus according to  claim 2 , wherein said reception characteristic detecting section detects a reception BER.  
     
     
         4 . An apparatus according to  claim 2 , wherein said reception characteristic detecting section detects a reception SIR.  
     
     
         5 . (cancelled)  
     
     
         6 . (cancelled)  
     
     
         7 . (cancelled)  
     
     
         8 . (cancelled)  
     
     
         9 . (cancelled)  
     
     
         10 . (cancelled)  
     
     
         11 . An apparatus according to  claim 2 , wherein said delay profile calculating section calculates an average delay profile by averaging values obtained by performing delay profile calculation by a predetermined number of times, said finger path allocating section allocates path positions to said plurality of fingers on the basis of the average delay profile, and said delay profile calculation control section controls the number of times of calculations in said delay profile calculating section on the basis of the reception characteristics detected by said reception characteristic detecting section.  
     
     
         12 . (cancelled)  
     
     
         13 . An apparatus according to  claim 11 , wherein said delay profile calculation control section decreases the number of times of calculations in said delay profile calculating section when the reception characteristics detected by said reception characteristic detecting section improve, and increases the number of times of calculations in said delay profile calculating section when the reception characteristics deteriorate.  
     
     
         14 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, comprising: 
 a delay profile calculating section for calculating a delay profile using a reception signal;    a finger path allocating section for allocating path positions to said plurality of fingers on the basis of the delay profile calculated by said delay profile calculating section;    a reception characteristic detecting section for detecting reception characteristics of the reception signal; and    a delay profile calculation control section for controlling an in-phase addition count in delay profile calculation in said delay profile calculating section on the basis of the reception characteristics detected by said reception characteristic detecting section.    
     
     
         15 . (cancelled)  
     
     
         16 . An apparatus according to  claim 14 , wherein said delay profile calculation control section sets an in-phase addition count in said delay profile calculating section to a predetermined count in accordance with a predetermined threshold when the reception characteristics detect-ed by said reception characteristic detecting section are good as compared with the predetermined threshold.  
     
     
         17 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, comprising: 
 a delay profile calculating section for calculating a delay profile;    a finger path allocating section for operating said fingers on the basis of the delay profile generated by said delay profile calculating section;    a rake reception section for combining despreading results output from said plurality of fingers;    a reception data processing section for demodulating an output from said rake reception section and outputting resultant digital data as a demodulated output signal;    a known data table in which known data to be contained in a reception signal is stored in advance;    a threshold table in which a threshold associated with an error rate of a reception signal is stored in advance;    a reception data comparing section for obtaining an error rate of the reception signal by comparing known data contained in an output signal from said reception data processing section with the known data stored in said known data table, and outputting a signal in accordance with a result of comparison between the error rate and the threshold stored in said threshold table; and    a delay profile calculation control section for out-putting a control signal for controlling operation of said delay profile calculating section on the basis of an out-put from said reception data comparing section.    
     
     
         18 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, comprising: 
 a delay profile calculating section for calculating a delay profile;    a finger path allocating section for operating said fingers on the basis of the delay profile generated by said delay profile calculating section;    a rake reception section for combining despreading results output from said plurality of fingers, outputting the resultant data, and estimating and outputting a reception SIR;    a threshold table in which a threshold associated with a reception SIR is stored in advance;    a reception data comparing section for outputting a signal corresponding to a result of comparison between the reception SIR from said rake reception section and the threshold stored in said threshold table; and    a delay profile calculation control section for out-putting a control signal for controlling operation of said delay profile calculating section on the basis of an out-put from said reception data comparing section.    
     
     
         19 . A radio communication apparatus which is used in a CDMA communication system, has a plurality of fingers, and performs rake reception, wherein reception quality is ensured and power consumption is reduced by controlling a delay profile calculation cycle for obtaining path positions allocated to said fingers on the basis of reception characteristics.  
     
     
         20 . (cancelled)  
     
     
         21 . (cancelled)  
     
     
         22 . (cancelled)  
     
     
         23 . (cancelled)  
     
     
         24 . (cancelled)