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CDMA receiver, path managing method and relative path managing program

A code division multiple access and path management technology, applied in the field of code division multiple access receivers, can solve problems such as prolonged processing time

Inactive Publication Date: 2007-04-18
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the conventional CDMA receiver mentioned above must perform path search at the time of DHO and store path information about each branch
Therefore, the processing time is extended, and more memory space is also required to store path information

Method used

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  • CDMA receiver, path managing method and relative path managing program
  • CDMA receiver, path managing method and relative path managing program
  • CDMA receiver, path managing method and relative path managing program

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Embodiment Construction

[0020] Referring now to the accompanying drawings, a detailed description of a preferred embodiment of the present invention will be given.

[0021] FIG. 1 is a block diagram showing the configuration of a CDMA receiver according to a first embodiment of the present invention. The CDMA receiver of the present embodiment includes a path search component 1 for searching path information, a memory 2 for storing information, a delay profile 3 generated for corresponding branches, and a matching for generating a delay profile 3 based on a received signal A filter 4, an interdigital section 5 composed of a plurality of units, and a rake receiving section 6 for synthesizing outputs from the interdigital section 5. The memory 2 includes a detected path table storage space 21 for holding path information detected by the path searching section 1 .

[0022] The matched filter 4 generates a delay profile with respect to each branch (each base station) based on the received signal by usin...

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Abstract

A CDMA receiver capable of reducing path search processing time. A CDMA receiver comprises a path search section for specifying finger allocation according to delay profiles of respective branch signals received from base stations, a plurality of fingers which are allocated to the branch signals based on the finger allocation specified by the path search section, and a rake receiving section for maximal- ratio- combining the power of a plurality of signals obtained from the fingers, which have been distributed due to their respective delays. The path search section includes a path management section to search for paths in response to the branch signals, and stores detected path information in a detected path table storing area in a memory. The number of paths which the path management section searches for is changed according to the number of received branch signals. Thereby, the processing time for a path search on the occasion when the number of branches has increased can be shortened. Consequently, the CDMA receiver consumes lower amounts of power.

Description

technical field [0001] The present invention generally relates to code division multiple access (CDMA) receivers, and more specifically, the present invention relates to a CDMA receiver, a path management method and a corresponding path management program during diversity handover. Background technique [0002] In mobile communications, since the lengths of transmission paths differ between the respective reception waves of multi-wave propagation, multi-waves (multi-paths) having different propagation delay times interfere with each other. [0003] A CDMA (Code Division Multiple Access) receiver spreads information data over the entire frequency band by using a high-rate spreading code whose cycle is shorter than propagation time, and thus, multiple waves different from each other in propagation delay time can be separated / extracted. This type of CDMA receiver selects an effective or usable path based on the power delay profile generated by despreading the received signal, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04J13/02H04B1/707H04B1/7117H04B7/02
CPCH04B1/7113H04B1/7117
Inventor 上野政义
Owner LENOVO INNOVATIONS LTD HONG KONG