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Frequency-domain channel estimation method and device of generalized multi-carrier system

A multi-carrier system and frequency-domain channel technology, applied in the field of generalized multi-carrier system frequency-domain channel estimation, can solve the problems of low execution complexity and low estimation accuracy, and achieve high estimation accuracy and increased complexity

Inactive Publication Date: 2015-01-07
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing time-domain denoising method is restricted by the limitation of the number of pilots and uniform distribution requirements, and the problem of low estimation accuracy is provided, and to provide a discrete Fourier spread spectrum suitable for the block fading channel environment Channel estimation method for generalized multi-carrier systems to obtain better channel estimation performance with low execution complexity

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  • Frequency-domain channel estimation method and device of generalized multi-carrier system
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  • Frequency-domain channel estimation method and device of generalized multi-carrier system

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Embodiment Construction

[0034] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0035] Embodiment of a generalized multi-carrier system channel estimation method of the present invention

[0036] We take a single-user DFT-S-GMC uplink transmission system with a single transmit antenna and a single receive antenna as an example to illustrate. The communication environment is a block-fading PB channel with severe frequency selection. The frequency is 2GHz, and the system bandwidth is 5MHz, the size of the long block Fourier transform of the data is 512, the length of the cyclic prefix is ​​39, the size of the Fourier transform of the pilot short block is 256, the length of the cyclic prefix is ​​31, the number of subbands is 4, and the mapping mode It is distributed, and the subband positions are 4, 10, 21, and 25, respectively. The background noise follows a compound additive Gaussian distribution with zero mean. Data ...

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Abstract

The invention relates to a frequency-domain channel estimation method and device of a generalized multi-carrier system. The channel estimation method comprises the following steps that: a transmitting end distributes pilot frequency into each user according to a data mapping mode; a receiving end extracts and receives a pilot frequency signal according to the pilot frequency mapping scheme, and estimates the channel frequency responses at pilot frequency subcarriers according to the least square criterion; then linear frequency-domain smooth filtering is carried out on a least-square channel estimation value; oversampling operation is carried out on channel frequency responses at corresponding subbands of a short pilot frequency block by utilizing the DFT oversampling characteristics; and finally, on the basis of the channel frequency response estimation value at the oversampled pilot frequency block, linear interpolation and extrapolation are carried out on time dimension so as to obtain the channel frequency response estimation value at corresponding long-block data subbands of specific users in a whole subframe, and calculate the coefficient of a following frequency-domain equalizer. Compared with the traditional frequency-domain least-square method, the method has the advantages that the increase of the complexity can be almost ignored, but the estimation performance is improved. The method can be applicable to block fading channels.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a generalized multi-carrier system frequency domain channel estimation method and device. Background technique [0002] At present, the third-generation (3G) mobile communication technology has brought unprecedented experience to people's lives, but people's needs have not stagnated because of this. 3GPP LTE (or B3G) is establishing a network that can obtain high transmission rates and low latency. Time-based, packet-based optimized and evolvable wireless access architecture. Aiming at the uplink transmission requirements of the LTE physical layer, my country proposes an uplink transmission scheme based on discrete Fourier transform spread spectrum generalized multi-carrier (DFT-S-GMC) system. The scheme has the advantages of low peak-to-average ratio, robustness to time-frequency synchronization error and multiple access interference. Since the shadow ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 徐美玉王丹杨雷张雷鸣王勇
Owner HENAN UNIV OF SCI & TECH
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