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Method and device for determining valid signal-to-noise ratio

A technology of signal-to-noise ratio and equivalent channel, applied in baseband systems, digital transmission systems, electrical components, etc., can solve the problems of difficult implementation and high computational complexity, and achieve the effect of reducing computational complexity

Active Publication Date: 2011-11-09
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The embodiment of the present invention provides a method for determining the effective signal-to-noise ratio, which is used to solve the problem that the effective signal-to-noise ratio calculation method mentioned in the prior art requires a large number of matrix operations and exponential logarithmic operations, and the calculation complexity is relatively high. , implement quite difficult problems, including:

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Embodiment approach

[0055] During implementation, when OFDM is a multi-codeword OFDM system, there can be multiple implementations to obtain the equivalent channel capacity corresponding to each codeword The embodiment of the present invention provides an implementation mode, and the specific implementation mode is as follows:

[0056] According to the formula Average the equivalent channel correlation matrix corresponding to each precoding matrix to obtain the average equivalent channel correlation matrix

[0057] according to The diagonal elements of Divide the equivalent channel capacity of multiple codewords, using the formula , i=1, 2, ..., N C Obtain the equivalent channel capacity corresponding to the i-th codeword Among them, N C is the number of codewords in the OFDM system, The diagonal elements of are ω l , l=, 1,..., L, L represents the number of channel transmission layers, and the set of channel transmission layer sequence numbers corresponding to the i-th codeword is...

Embodiment 1

[0065] Embodiment 1: Effective SNR measurement in single-codeword closed-loop precoding mode

[0066] The effective signal-to-noise ratio measurement in the single-codeword closed-loop precoding mode includes calculating the estimated value of the channel correlation matrix, multiplying the precoding matrix, calculating the channel capacity, averaging the channel capacity, and calculating the effective signal-to-noise ratio.

[0067] Wherein, calculating the estimated value of the channel correlation matrix includes steps such as obtaining the channel estimation result of the pilot position LS, multiplying the matrix, accumulating and averaging, and subtracting the noise power.

[0068] When implementing the step of multiplying the precoding matrix, refer to 3GPP TS36.211 (3rd Generation Partnership Project Technical Specification, 36.211), for the single codeword closed-loop precoding mode, there are four optional precoding matrices In this case, only one precoding matrix is ...

Embodiment 2

[0072] Embodiment 2: Effective SNR measurement under two-codeword open-loop space division multiplexing mode

[0073] The effective signal-to-noise ratio measurement in the two-codeword open-loop space division multiplexing mode includes the steps of calculating the channel correlation matrix, multiplying the precoding matrix, calculating the channel capacity, averaging the channel capacity, dividing the channel capacity by codewords, and calculating the effective signal-to-noise ratio.

[0074] Wherein, calculating the estimated value of the channel correlation matrix includes steps such as obtaining the channel estimation result of the pilot position LS, multiplying the matrix, accumulating and averaging, and subtracting the noise power.

[0075] When implementing the step of multiplying the precoding matrix, refer to 3GPP TS36.211, for the two-codeword open-loop space division multiplexing mode of the second embodiment, there are two optional precoding matrices, and the tran...

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Abstract

The invention discloses a method for determining a valid signal-to-noise ratio, comprising the following steps of: in an OFDM (orthogonal frequency division multiplexing) system, determining a channel correlation matrix estimation value of a measured bandwidth according to the channel estimation result of a time frequency sub-channel at a pilot frequency position in the measured bandwidth; respectively calculating channel capacity of the time frequency sub-channel of each interference type of the measured bandwidth by using the channel correlation matrix estimation value; obtaining an average equivalent channel capacity of each time frequency sub-channel on the measured bandwidth according to the channel capacity of the time frequency sub-channel of each interference type; and determining the valid signal-to-noise ratio of the measured bandwidth according to the average equivalent channel capacity of each time frequency sub-channel. The invention further discloses a device for determining a valid signal-to-noise ratio. With the method and the device provided by the invention, computational complexity for the valid signal-to-noise ratio can be reduced.

Description

technical field [0001] Embodiments of the present invention relate to a wireless communication system, and in particular to a method and device for determining an effective signal-to-noise ratio in this field. Background technique [0002] In OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, AMC (Adaptive Modulation and Coding, Adaptive Modulation and Coding) technology can dynamically select the most appropriate modulation and coding method according to the user's instantaneous channel quality and current resources , enabling users to achieve the highest possible data throughput rate. The user channel quality status is generally indicated by SNR (Signal to Noise Ratio, signal to noise power ratio). [0003] The OFDM system is designed so that multiple orthogonal sub-channels transmit user data simultaneously, and the quality status of each sub-channel may be different. The overall quality status of these sub-channels is ...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04L1/00
CPCH04L25/0228H04L25/0242
Inventor 焦飞李斌
Owner ZTE CORP
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