Radio communication apparatus used in CDMA communication system, which has fingers and is designed to perform rake reception, and power consumption control method therefor
a technology of cdma communication system and radio communication apparatus, applied in power management, radio/inductive link selection arrangement, diversity/multi-antenna system, etc., can solve problems such as serious problems, demodulation failure, and increase in power consumption, and achieve good reception quality and reduce power consumption
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first embodiment
FIG. 8 is a block diagram showing a demodulation circuit which performs demodulation by despreading and serves as a radio communication apparatus according to the present invention in a CDMA mobile station.
Referring to FIG. 8, this demodulation circuit is comprised of a delay profile calculating section 20 for calculating a delay profile, a finger path allocating section 12 for operating fingers 13a and 13b on the basis of the delay profile generated by the delay profile calculating section 20, a finger section 13 constituted by the fingers 13a and 13b for despreading reception signals, a rake reception section 14 for combining the despreading results as the outputs from the fingers 13a and 13b, a reception data processing section 15 for demodulating the output from the rake reception section 14 and outputting the resultant digital data as a demodulated output signal, a reception characteristic detection unit constituted by a known data table 16 in which known data (e.g., pilot sym...
second embodiment
the present invention will be described next.
FIG. 13 is a block diagram showing the second embodiment of a demodulation circuit which performs demodulation by despreading and serves as a radio communication apparatus according to the present invention in a CDMA mobile station.
Referring to FIG. 13, this demodulation circuit is comprised of a delay profile calculating section 20 for calculating a delay profile, a finger path allocating section 12 for operating fingers 13a and 13b on the basis of the delay profile generated by the delay profile calculating section 20, a finger section 13 constituted by the fingers 13a and 13b for despreading reception signals, a rake reception section 28 for combining the despreading results as the outputs from the fingers 13a and 13b, outputting the resultant data, and estimating and outputting a reception SIR (Signal to Interference Ratio), a reception data processing section 15 for demodulating the output from the rake reception section 28 and out...
third embodiment
the present invention will be described next.
FIG. 15 is a block diagram showing the third embodiment of a demodulation circuit which performs demodulation by despreading and serves as a radio communication apparatus according to the present invention in a CDMA mobile station.
The same reference numerals as in FIG. 8 denote the same parts in FIG. 15, and a detailed description thereof will be omitted.
In the third embodiment, a delay profile calculating section 20 has the same internal arrangement as that shown 10 in FIG. 9, and hence will be described with reference to FIG. 9.
According to the reception characteristic detection function of the third embodiment, a first threshold and a second threshold lower than the first threshold are stored in a threshold table 17a in FIG. 15 in advance. A reception data comparing section 18 outputs a first reception good signal when a reception BER is equal to or lower than the first threshold, and outputs a second reception good signal when a...
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