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

Inactive Publication Date: 2005-02-10
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes an improved radio device for use in a CDMA communication system that reduces power usage without sacrificing signal strength or causing interference with other signals. It also includes methods for allocating paths between fingers within the device's hardware design. Overall, this technology helps improve efficiency and performance of wireless devices operating in these systems.

Problems solved by technology

The technical problem addressed in this patent text relates to improving the efficiency of a demodulation circuit in a CDMA mobile phone or similar device. This is because the traditional method of calculating the delay profile for all potential transmission paths leads to unnecessary power usage during certain stages of operation. There is also a risk that important information will be missed if the delay profile calculation interval is too long. The goal is to find a way to optimize the performance of the demodulation circuit without sacrificing quality of service.

Method used

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

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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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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.

Description

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Claims

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Application Information

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Owner NEC CORP
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