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A kind of channel parameter estimation method and system

A channel parameter and channel technology, applied in the field of channel parameter estimation methods and systems, can solve problems such as large MSE difference and carrier channel parameter estimation deviation, and achieve the effect of overcoming the deviation and improving the accuracy rate

Active Publication Date: 2018-12-11
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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Problems solved by technology

[0004] However, the above-mentioned method in the prior art has the following defects: when calculating the residual noise power after the first-stage filter (frequency domain filter), in order to reduce the amount of calculation, a uniform MSE mean value is used, ignoring the The MSE of different carrier channel parameter estimates is different, and in the pilot structure based on the downlink OFDM channel of the existing LTE and LTE-Advanced systems, the MSE of the channel parameter estimation on each carrier after filtering by the frequency domain filter is relatively large , the MSE at the pilot point is significantly smaller, and the MSE at the non-pilot point is significantly larger
Therefore, based on the existing LTE pilot structure, the uniform MSE mean value used as the residual noise covariance obviously differs greatly from the actual noise power, which causes a large deviation in the channel parameter estimation of each carrier

Method used

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  • A kind of channel parameter estimation method and system
  • A kind of channel parameter estimation method and system
  • A kind of channel parameter estimation method and system

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Experimental program
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Effect test

Embodiment 1

[0026] The present invention provides a channel parameter estimation method, such as figure 1 shown, including:

[0027] 101. Calculate the mean square error (MSE) of channel parameter estimation of each carrier in the first pilot OFDM symbol after frequency domain filtering.

[0028] 102. Calculate the average MSE of channel estimation at each pilot symbol and non-pilot symbols by using the MSE estimated by the above-mentioned channel parameters of each carrier.

[0029] 103. Based on the difference in the number of pilot symbols and data symbols of each carrier in the time domain direction, calculate the average MSE sequentially, use it as the residual noise of each carrier, and use the residual noise of each carrier to calculate its corresponding time domain filter coefficients.

[0030] 104. Perform time-domain filtering on the channel parameter values ​​obtained after frequency-domain filtering by using the time-domain filtering coefficients to obtain final channel para...

Embodiment 2

[0033] The present invention also provides a channel parameter estimation method, such as figure 2 shown, including:

[0034] 201. Use the LS (least square, Least Square) algorithm to calculate the first channel parameter value H where the pilot symbol is inserted ls ;

[0035] Specifically, H ls =X -1 Y, where X is the original value of the pilot symbol transmitted by the transmitter, and Y is the pilot symbol received by the receiver;

[0036] 202. Calculate frequency-domain filter coefficients, and for the above-mentioned first channel parameter value H ls Perform frequency domain filtering to obtain the second channel parameter value

[0037] 203. Calculate the mean square error MSE of each carrier channel parameter estimation in the first pilot OFDM symbol after frequency domain filtering;

[0038] 204. Calculate the average MSE of the channel estimation at each pilot symbol and non-pilot symbol respectively by using the MSE estimated by the above-mentioned chann...

Embodiment 3

[0082] The present invention also provides a channel parameter estimation system, which can be used to implement the channel parameter estimation method described in Embodiment 1 or 2, such as image 3 As shown, the system can include:

[0083] The first calculation unit 301 is used to calculate the mean square error MSE of each carrier channel parameter estimate in the first pilot OFDM symbol after frequency domain filtering;

[0084] The second calculation unit 302 is configured to calculate the average MSE of the channel estimation at each pilot symbol and the non-pilot symbol by using the MSE estimated by the above-mentioned carrier channel parameters;

[0085] The third calculation unit 303 is used to sequentially calculate the average MSE based on the difference in the number of pilot symbols and data symbols of each carrier in the time domain direction, and use it as the residual noise of each carrier, and use the above residual noise of each carrier Calculate its corr...

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Abstract

The embodiment of the invention relates to the technical field of communication, and discloses a channel parameter estimation method and system. The method comprises the steps that mean square error MSE of channel parameter estimation of each carrier in a first pilot frequency OFDM symbol after frequency domain filtering is calculated; mean MSE of channel estimation of each pilot frequency symbol and non-pilot frequency symbol is respectively calculated by utilizing the MSE of channel parameter estimation of each carrier; the mean MSE is calculated in turn based on difference of the number of pilot frequency symbols and data symbols of each carrier in a time domain direction and acts as residual noise of each carrier, and the corresponding time domain filer coefficient is calculated by utilizing residual noise of each carrier; and time domain filtering is performed by utilizing a channel parameter value obtained via filtering performed on a frequency domain by the time domain filtering coefficient so that a final channel parameter value is obtained. With application of the embodiment of the invention, accuracy of channel parameter estimation can be enhanced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a channel parameter estimation method and system. Background technique [0002] Channel estimation is a necessary step in the downlink demodulation link in a non-coherent OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) modulation system. In the LTE (Long Term Evolution, long-term evolution) or LTE-A (LTE-Advanced, LTE evolution) system, in order to ensure the reliability of the communication link in a high-speed, multi-path transmission environment, it is necessary to adopt noise suppression The optimal MMSE (Minimum Mean Squared Error) channel estimation filtering method is used to track wireless communication channels with fast time-varying and high frequency selectivity. [0003] In the prior art, there is a noise covariance (power) optimization method that can be used for 2-dimensional MMSE channel estimation. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 裴二荣陈苗
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD
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