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Channel estimation method of multi-carrier-wave-CDMA accessing system

A code division multiple access and channel estimation technology, which is applied in code division multiplexing systems, multi-frequency code systems, and multiplexing communications, etc., and can solve problems such as high computational complexity and difficult practical applications

Inactive Publication Date: 2006-08-09
SHANGHAI RES CENT FOR WIRELESS TECH
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AI Technical Summary

Problems solved by technology

[0017] The above channel estimation method needs to accurately calculate the channel estimation e of each point according to the formula n，m , the computational complexity is large, and it is difficult to apply in practice

Method used

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  • Channel estimation method of multi-carrier-wave-CDMA accessing system
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  • Channel estimation method of multi-carrier-wave-CDMA accessing system

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Embodiment Construction

[0094] The following is attached Figure 1-7 The embodiment of the MC-CDMA storage channel estimation method for the multi-carrier-code division multiple access system of the present invention is described in detail.

[0095] The present invention is embedded in the MC-CDMA multi-carrier-code division multiple access system 101, and the storage channel estimator 102 adopting the iterative channel estimation method is composed of a controller (including memory) module 701, a control initialization module 702, and a counter module 703 , EFGH calculator and memory module 704, A-I calculator and memory module 705, γ estimator module 706, 707-β calculator module, and e calculator module 708. Applying the implanted iterative channel estimation method estimator 102, the storage channel estimation method is as follows:

[0096] Step S1-1: Determine the boundary conditions 601 of the received signal of the first user in the time domain and frequency domain.

[0097] Such as Figure ...

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Abstract

Using iterative way, the disclosed method carries out channel estimation, simplifies channel estimation of multicarrier-CDMA access system so as to simplify complexity of calculation. Comparing with public algorithm for carrying out channel estimation under weighted average of received pilot frequency data being as beta n+1ú¼m and betanú¼m+1, the disclosed method has complexity as o(N+M) for example, then public algorithm has complexity as o((N+M)2). The disclosed storage type channel estimation method saves calculation time and is easy to be applied to application.

Description

technical field [0001] The present invention relates to communication technology, in particular to a channel estimation method for a multi-carrier-code division multiple access system, in particular to an iterative method embedded in a channel estimator, for multi-carrier-code division multiple access systems method for channel estimation. Background technique [0002] Multi-Carrier-Code Division Multiple Access (MC-CDMA, Multi-Carrier Code Division Multiple Access) is a combination of spread spectrum Code Division Multiple Access (CDMA, Code Division Multiple Access) technology and Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology fusion multiple access system. In the whole system, the channel parameter e is obtained through the known sending and receiving data, the channel is estimated, and channel compensation is performed to eliminate the influence of the channel on the correctness of transmission as much as possibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04J13/00
Inventor 唐琳张小东熊勇
Owner SHANGHAI RES CENT FOR WIRELESS TECH