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Method, apparatus and system for signal transmission and channel estimation

A channel estimation and channel technology, applied in the baseband system, transmission system, multi-frequency code system, etc., can solve the problem that the reliability of channel estimation at the virtual pilot cannot be guaranteed, the complexity is high, and the correctness of the virtual pilot symbol cannot be guaranteed and other problems to achieve the effect of increasing complexity, avoiding waste, and reducing system complexity

Active Publication Date: 2013-01-30
HUAWEI TECH CO LTD
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Problems solved by technology

[0006] However, the inventors of the present invention found that in the OFDM channel estimation scheme based on virtual pilots and power control, it is necessary to demodulate user data, and determine whether the signal can be used as Virtual pilots combine the selected virtual pilots and actual pilots together to complete channel estimation. This method cannot ensure the correctness of demodulation on virtual pilot symbols, and thus cannot guarantee the reliability of channel estimation at virtual pilots.
In addition, the user terminal has to perform virtual pilot selection for each data subcarrier, resulting in high complexity

Method used

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  • Method, apparatus and system for signal transmission and channel estimation
  • Method, apparatus and system for signal transmission and channel estimation
  • Method, apparatus and system for signal transmission and channel estimation

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Embodiment Construction

[0047] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] The first embodiment of the present invention relates to a channel estimation method, including the following steps:

[0049] The first step: demodulate and decode the data of the virtual pilot channel;

[0050] The second step: verify the decoding result;

[0051] The third step: if the verification is passed, reconstruct the decoding result as a virtual pilot symbol;

[0052] The fourth step: use virtual pilot symbols and actual pilot symbols to perform channel estimation.

[0053] The virtual pilot symbol in the third step is a symbol that is reconstructed and sent using the decoding result, transmission power, and modulation and coding mode information. The first embodiment of the present invention will be specifically described in conjunc...

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Abstract

The wireless communications field is related. A method, device and system thereof for channel estimation are disclosed: the channel estimation performance of OFDM system is improved without increasing the pilot overhead. The method includes: demodulating and decoding the virtual pilot channel data; checking the decoded result, if passing the check, restructuring the decoded result into virtual pilot symbols; making channel estimation with virtual pilot symbols and real pilot symbols. Each subcarrier composed in the virtual pilot channel and each subcarrier for transmitting pilot symbol are inter-complemented, for example, cross-arranging equidistantly.

Description

Technical field [0001] The present invention relates to the field of wireless communication, in particular to signal transmission and channel estimation technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, referred to as "OFDM") technology is based on orthogonal multi-carrier, which can effectively increase the transmission rate while avoiding various interferences caused by high speed. Higher data transmission rates can be achieved by using OFDM technology, which is currently used in wireless local area networks. [0003] The basic principle of OFDM is to transfer high-speed data streams through serial / parallel conversion and allocate them to several sub-channels with relatively low rates for transmission. Therefore, the symbol period in each sub-channel will be relatively increased, which can reduce the number of wireless channels. Inter-symbol interference caused by the time dispersion caused by the pa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B1/76
CPCH04L27/2647H04L25/0224
Inventor 姚红梅
Owner HUAWEI TECH CO LTD
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