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Method, apparatus and system for signal transmission and channel estimation

A signal transmission device and channel estimation technology, applied in baseband systems, transmission systems, multi-frequency code systems, etc., can solve the problem of inability to ensure the correctness of virtual pilot symbols, high complexity, and inability to ensure channel estimation at virtual pilots Reliability and other issues, to achieve the effect of increasing complexity, avoiding waste, and reducing system complexity

Active Publication Date: 2009-03-11
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 purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

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

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

[0050] Second step: check the decoding result;

[0051] The 3rd step: if by checking, then decoding result is reconstructed as virtual pilot symbol;

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

[0053] In the third step, the virtual pilot symbols are symbols that are reconstructed and transmitted using the decoding result, transmission power, and modulation and coding scheme information. The first embodiment of the present invention will be described in detail in conju...

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Abstract

The invention relates to the wireless communication field, and discloses a channel estimating method and the device thereof. The method can improve the channel estimating performance of the OFDM system without increasing the pilot frequency spending. The invention demodulates and decodes the data in virtual pilot channel, checks the decoded result, and reconstructs the decoded result as virtual pilot symbols and uses virtual pilot symbols and actual pilot symbols to estimate the channel when the decoded result passes through the check. All subcarriers forming the virtual pilot channel and allsubcarriers which are used for transmitting pilot symbols complement each other; for example, the two groups of subcarriers can be crosswise arranged at equal intervals.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to signal transmission and channel estimation technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM for short) technology is based on orthogonal multi-carriers, which can effectively increase the transmission rate while avoiding various interferences caused by high speed. Using OFDM technology can achieve a higher data transmission rate, which has been adopted in the wireless local area network at present. [0003] The basic principle of OFDM is to distribute high-speed data streams to several sub-channels with relatively low rates for transmission through serial / parallel conversion. The intersymbol interference caused by the time dispersion caused by the path delay extension to the system. In addition, due to the introduction of the guard interval, when the guard interval is greater than the maximum multipath delay extension, the intersym...

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Application Information

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IPC IPC(8): H04L27/26H04B1/76
CPCH04L27/2647H04L25/0224
Inventor 姚红梅
Owner HUAWEI TECH CO LTD
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