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Transmission line estimating device, CDMA receiving device, and transmission line estimating method

一种信道估计、码分多址的技术，应用在多个站之间的通信、电气元件、传输的控制/均衡等方向，能够解决影响多径干扰抑制效果、扩频增益降低等问题

Inactive Publication Date: 2008-02-20
NEC CORP +1
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Problems solved by technology

However, when multi-code transmission is implemented in a CDMA system, the effective spread spectrum gain is reduced to affect the suppression effect of multipath interference.

Method used

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  • Transmission line estimating device, CDMA receiving device, and transmission line estimating method
  • Transmission line estimating device, CDMA receiving device, and transmission line estimating method
  • Transmission line estimating device, CDMA receiving device, and transmission line estimating method

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Embodiment Construction

[0047] Modes for carrying out the invention will be described in detail below with reference to the accompanying drawings.

[0048] FIG. 4 is a block diagram illustrating a corrected channel estimation apparatus according to a first exemplary embodiment of the present invention. Referring to FIG. 4 , the corrected channel estimation device of this exemplary embodiment includes a path search unit 1 and a channel estimation unit 2 1 -2 L , and a channel estimation correction unit 5 .

[0049] The path search unit 1 generates a delay profile of a transmission path using a pilot signal multiplexed on a received signal, and detects a plurality of paths exhibiting a higher reception level from the delay profile.

[0050] Each modified channel estimation unit 2 1 -2 L It includes a pilot despreading unit 3 and a symbol averaging unit 4 . For example, the modified channel estimation unit 2 1 Including pilot despreading unit 3 1 and sign averaging unit 4 1 ; Modified channel es...

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Abstract

Disclosed is a corrected transmission line estimating device for removing the leakage of a side lobe component between transmission lines from an estimated transmission line value, thereby to enhance precision. A transmission line estimating unit determines the estimated transmission line values of a plurality of transmission lines from signals to arrive through multipaths. A transmission line estimation correcting unit removes the leakage of the side lobe component between the transmission lines from the estimated transmission line value determined by the transmission line estimating unit, thereby to correct the estimated transmission line value. Thus, the correction transmission estimating device estimates the transmission line of the multipaths.

Description

technical field [0001] The present invention relates to a channel estimating device and a code division multiple access (CDMA) receiving device using the channel estimating device, in particular to a corrected channel estimating device for improving the accuracy of channel estimation and a CDMA using the corrected channel estimating device receiving device. Background technique [0002] The Direct Sequence Code Division Multiple Access (DS-CDMA) scheme can effectively suppress the interference from other cells in a multi-cell environment. Therefore, the DS-CDMA scheme can realize the so-called repeated frequency allocation of a single cell, and use the same frequency in adjacent cells, so as to be suitable as a wireless access scheme for mobile communication. [0003] The CDMA scheme can also realize the path diversity effect by separating the multipath transmission paths and RAKE combining them when performing despreading. [0004] However, in mobile communication in rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26
CPCH04B1/7113H04B1/711H04B7/005
Inventor 松本真理子吉田尚正前田规行川本润一郎
Owner NEC CORP
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