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Cellar system, mobile portable apparatus, base station apparatus, optimum path detecting method, and apparatus thereof

A technology of the best path and portable equipment, applied in the field of CDMA cellular system, can solve the problem that the data cannot be received with an error rate, etc.

Inactive Publication Date: 2003-06-18
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, data cannot be received with a low error rate

Method used

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  • Cellar system, mobile portable apparatus, base station apparatus, optimum path detecting method, and apparatus thereof
  • Cellar system, mobile portable apparatus, base station apparatus, optimum path detecting method, and apparatus thereof
  • Cellar system, mobile portable apparatus, base station apparatus, optimum path detecting method, and apparatus thereof

Examples

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no. 1 example

[0062] figure 2 is a block diagram showing the configuration of a mobile device of a digital mobile phone / portable phone system (cellular system) using a CDMA system according to an embodiment of the present invention.

[0063] In the cellular transmitting / receiving device according to the embodiment of the present invention, the antenna 101 transmits an uplink RF signal amplified by a transmitting amplifier. Also, the antenna 101 receives a downlink RF signal having a wide frequency band spread spectrum transmitted from a base station and supplies the received signal to a transmission / reception amplification section (AMP) 102 . AMP102 has a transmit amplifier and a low noise amplifier. The transmit amplifier amplifies the power of the transmit RF signal. The low noise amplifier amplifies the received RF signal. AMP102 demultiplexes RF transmit signal and RF receive signal. The radio part (TRX) 103 will convert the baseband spread spectrum transmission signal of the digita...

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PUM

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Abstract

A cellar system using code divisional multiple access (CDMA) system is disclosed, that comprises a plurality of finger circuits, and a search engine portion having a reception level measuring portion for detecting reception levels from reception signals and comparing the reception levels with a predetermined threshold value, a plurality of inversely spreading portions for multiplying the reception signals by spread codes, an inner memory for storing correlation signals received from the plurality of inversely spreading portions, and a reception path timing generating portion for detecting reception paths from output signals of the inner memory and, generating a path timing, wherein the search engine portion determines whether or not to output a correlation signal of the inner memory to the reception path timing generating portion.

Description

technical field [0001] The present invention relates to a CDMA (Code Division Multiple Access) cellular system, in particular, a CDMA cellular system that allows path timing to be obtained corresponding to the maximum reception level of received data, an optimal path detection method and its equipment, a mobile portable device, and a base station equipment. Background technique [0002] In digital mobile phone systems and portable phone systems (cellular systems) using CDMA systems, rake / diversity reception technology and transmission power control technology have been widely used because of high security, anti-interference, large communication capacity and high-quality communication Used in CDMA cellular systems under multipath fading environment. [0003] In conclusion, receive path timing search technique is important. The search accuracy of receive path timing greatly affects the characteristics of the rake / diversity reception process of a CDMA cellular system. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B1/7117H04B7/04H04B7/08H04B7/26H04L7/00H04W16/28H04W56/00
CPCH04B1/7073H04B1/712H04B1/7115H04B1/7117H04B7/04
Inventor 大岛学
Owner NEC CORP