Joint-iterative channel estimation and decoding method of Turbo-OvCDM system

A channel estimation and joint iteration technology, applied in transmission systems, digital transmission systems, baseband system components, etc., can solve the problems of high complexity and low performance

Inactive Publication Date: 2009-10-14
SHANDONG UNIV
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Problems solved by technology

[0007] Aiming at the problem that the performance of the original channel estimation algorithm is not high but the complexity is high in the Turbo-OvCDM system, the present invention provides a joint iterative channel estimation and decoding of the Turbo-OvCDM system that can improve the system performance and reduce the system complexity method

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Embodiment Construction

[0033] The receiving end accesses the iterative receiving structure after channel estimation is as follows: figure 2 shown. The process of channel estimation and decoding of the whole Turbo-OvCDM system is as follows:

[0034] (1) In the first iteration, the channel estimator uses the initial pilot symbols and adopts the minimum mean square error (Minimum Mean Square Error, MMSE) estimation algorithm to perform preliminary channel estimation on the channel gain. Assuming that the pilot symbol vector is P, it corresponds to initial channel gain It can be obtained by the following formula:

[0035] H ^ ( 0 ) = ( P * P + σ n 2 I ) ...

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Abstract

The invention relates to a joint-iterative channel estimation and decoding method of a Turbo-OvCDM system. The method comprises the following steps: a small amount of pilot frequency symbols are inserted in the transmitted data by each frame, the channel impact response is estimated by using the known pilot frequency symbols and the unknown coded information and by an iteration method, the pilot frequency symbols are used for proving the original channel estimation information, and the system performs decoding to the received unknown information by using the obtained original channel estimation information; and the estimated information obtained by decoding is utilized as the new pilot frequency symbol required for the channel estimation during the next iteration, and the iteration process is repeated at all time until to meet the requirements. The invention is based on the scheme of combined receiving of the iterative channel estimation feedback by judgment and the decoding, and the simulation result shows that the method has high convergence rate, reduces the complexity of the system under the condition of high-order iteration and has the performance being superior to that of the ordinary channel estimation method.

Description

technical field [0001] The invention relates to a channel estimation method in an overlapping code multiplexing (OvCDM) system, and belongs to the technical field of broadband wireless communication. Background technique [0002] Overlapped Code Division Multiplexing (Access), OvCDM (OvCDMA) technology has greatly improved the transmission reliability and spectrum efficiency of "waveform division multiple access", that is, CDMA (Code Division Multiple Access, CDMA) system , is a brand-new high-spectrum-efficiency coding multiplexing method and technology, which makes full use of the idea of ​​overlapping multiplexing and coding, and combines the two together. The capacity and spectral efficiency of the communication system are greatly improved by using parallel convolutional coding with a code rate higher than 1, and the spectral efficiency of the system is also improved while the coding gain is improved. [0003] Utilizing the property that the code rate of OvCDM is higher...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L1/00H04W28/04
Inventor 袁东风于卫华
Owner SHANDONG UNIV
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