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Wireless receiving system and method and device for channel estimation

A technology of channel estimation and processing method, which is applied in the field of communication, can solve the problems of channel estimation error increase and difficulty in implementing MIMO-OFDM/OFDM system noise reduction, etc., and achieve good noise reduction effect

Inactive Publication Date: 2010-08-18
HUAWEI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] In the process of realizing the present invention, the inventor found that there are at least the following problems in the first prior art: when there is a virtual carrier in the system, using the channel estimation vector in the frequency domain containing the virtual carrier to perform DFT transformation will cause a time-domain impulse response delay Extending the extension to the entire time domain vector, and then using the noise reduction processing method to force the part outside the channel impulse response delay extension to zero will lead to an increase in the channel estimation error. This is in the SNR (Signal to Noise Ratio) Ratio) is more obvious when larger
Therefore, DFT-based channel estimation and noise reduction techniques can only be applied to OFDM systems that do not contain virtual carriers, but almost all practically applied MIMO-OFDM / OFDM systems contain certain virtual carriers for frequency band protection, which makes existing technologies A DFT-based channel estimation technique is difficult to achieve noise reduction for MIMO-OFDM / OFDM systems

Method used

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  • Wireless receiving system and method and device for channel estimation
  • Wireless receiving system and method and device for channel estimation
  • Wireless receiving system and method and device for channel estimation

Examples

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Embodiment 1

[0077] In this embodiment, the noise reduction processing of the channel estimation result is performed based on the transmission coefficients of each sub-channel estimated in the MIMO-OFDM system. The flow of the channel estimation processing method in this embodiment is as follows figure 2 As shown, the following steps 201-204 are included:

[0078] Step 201, extracting channel estimation results that do not contain virtual carrier components in the initial channel estimation results

[0079] The initial channel estimation results in this step can be obtained by using various existing channel estimation algorithms, such as LS, MMSE (Minimum Mean Square Error, minimum mean square error) and ML (Maximum likelihood, maximum likelihood) and other data-assisted estimation algorithms and Blind Estimation Algorithm.

[0080] The following example illustrates the extraction the process of: is the estimated value of the frequency domain transmission coefficient of the kth su...

Embodiment 2

[0137] According to the analysis in Example 1, the column vector last N of used -N CP The rows contain only interference and noise, so these sample points can be used to estimate the interference and noise power. For receiving antenna q, the interference and noise power ω q It can be estimated by formula (25) that

[0138] ω ^ q = 1 M T ( N used - N CP ) Σ p = 1 M T Σ m = N CP N used - 1...

Embodiment 3

[0147] The decomposition matrix Q of the part of the frequency-domain transformation matrix used in the channel estimation and noise reduction in the first embodiment of the present invention can also be obtained by performing other similar decompositions on the part of the frequency-domain transformation matrix F. For example, in the third embodiment of the present invention, using Singular value decomposition SVD is used for channel estimation and noise reduction. When using singular value decomposition SVD,

[0148] F=UDV H (26)

[0149] Among them, the left singular matrix U and the right singular matrix V are unitary matrices, and D is the singular value diagonal matrix of F. The unitary matrix U obtained by singular value decomposition can also be used for channel estimation and noise reduction. that is,

[0150] g ^ = U H H ^ = ...

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Abstract

The invention relates to the technical field of communication, in particular to a wireless receiving system and a method and a device for channel estimation so as to obtain better noise reducing effect for channel estimation. The method provided by the invention comprises the following steps: extracting a channel estimation result without a virtual carrier component from initial channel estimation results; transforming the channel estimation result without the virtual carrier component to obtain a first transformation result with the conjugate transpose matrix of a decomposed matrix of a partial frequency domain transformation matrix, wherein the first transformation result does not comprises an interference component or a noise component; and transforming the first transformation result with the decomposed matrix to obtain a final channel estimation result. The invention adopts matrix transformation in the channel estimation, and fully considers the influence of the virtual carrier on the noise reduction technology for channel estimation. According to the simulation results, compared with the prior art, the invention has better noise reducing effect and facilitates the engineering practice.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a wireless receiving system and a channel estimation processing method and device. Background technique [0002] The demand for high-speed information transmission rate and the harsh mobile wireless channel transmission environment make MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) with high frequency band utilization and strong anti-multipath fading ability Division multiplexing) transmission technology has become a research hotspot, and has been paid much attention as the preferred technology for the new generation of wireless mobile communication systems. [0003] Channel estimation is the key technology of the wireless MIMO-OFDM transmission system. MIMO equalization, detection, channel quality measurement and soft decoding at the receiving end all...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 任光亮焦飞王光健曾雁星
Owner HUAWEI TECH CO LTD
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