Channel estimation method based on reference signal in LTE-A system in TM9 mode

A technology of LTE-A and channel estimation, applied in the field of channel estimation, which can solve the problems of prolonged estimation and high computational complexity, etc.

Active Publication Date: 2013-12-25
贾晓丽
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Problems solved by technology

However, the above channel estimation method needs to separate the received reference signals according to different layers, and the channel estimation algorithm still has high computational complexity and long estimation delay.

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  • Channel estimation method based on reference signal in LTE-A system in TM9 mode
  • Channel estimation method based on reference signal in LTE-A system in TM9 mode
  • Channel estimation method based on reference signal in LTE-A system in TM9 mode

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention.

[0027] figure 1 is a 3GPP LTE-A downlink system model diagram, such as figure 1As shown, at the sending end, the input bits first enter the channel coding module, and then the coded bits are scrambled and then modulated into complex modulation symbols. These complex modulation symbols are mapped to the transmission layer of one or more antenna ports, and each layer After precoding, it is mapped to the resource elements of each antenna port, and the reference signal is inserted at the same time. Finally, these symbols (including data symbols and reference signals) of each antenna port are modulated into complex time-domain OFDM signals, and transmitted in the wireless multiple transmission in the channel. At the receiving end, under ideal synchronization, the signal Y at the ...

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Abstract

The invention relates to a mobile communication technology, in particular to a channel estimation method of a LTE-A system. The channel estimation method is that reference signals special for terminals carried by resource blocks are utilized to perform preliminary LS channel estimation to subcarriers which the reference signals belong to at the corresponding positions under the condition of TM9-mode multiple-layer beam forming, an expectation-maximization (EM) iterative algorithm is adopted to perform accuracy processing of channel estimation values at the subcarrier positions distributed with the reference signals so as to decrease estimation errors, and then a frequency-domain LMMSE interpolation algorithm and a time-domain duplication interpolation algorithm are adopted to process channel estimation values of the subcarriers where the reference signals are not distributed. By the adoption of the channel estimation method, the channel estimation is achieved by utilizing collaboration of multiple received reference signals and local reference signals, the trouble that various layers of reference signals are extracted from mixed reference signals is avoided, processing flows are decreased, and the complexity degree of the subsequent processing and control is also reduced.

Description

technical field [0001] The invention belongs to channel estimation technology in a communication system, and in particular relates to a channel estimation method based on UE-specific RS in a 3GPP LTE-A downlink system. Background technique [0002] ITU-R issued a technical circular to the world to solicit IMT-Advanced, that is, to solicit 4G technical solutions. Since then, many technical organizations have submitted technical proposals to ITU-R, and 3GPP has also carried out LTE -Advanced (LTE-A) feasibility study. Since LTE has shown some of the technical characteristics of 4G, 3GPP began to solicit a series of LTE-A key technology proposals based on LTE version 8, aiming to enhance LTE to meet the requirements of IMT-Advanced. In other words, LTE-A will not be a technological revolution, but a smooth evolution of LTE. It will be forward compatible with the LTE system, and in order to meet the requirements of IMT-advanced, new technologies for backward compatibility will ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 唐伦王东军张驿强胡茂智石华宇陈前斌
Owner 贾晓丽
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