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Generation method of low-complexity pre-coding modulation matrix and pre-coding modulation method thereof

A modulation matrix, low-complexity technology, applied to the shaping network in the transmitter/receiver, baseband system components, preventing/detecting errors through diversity reception, etc., can solve the problem of no closed expression, low complexity, computationally complex issues

Active Publication Date: 2012-07-04
TSINGHUA UNIV
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Problems solved by technology

The mutual information of the modulation constraints and its gradient matrix relative to the precoding contain multiple integrals and no closed expressions, and the calculation is complex
So far, there is no better method that can provide a low-complexity, practical precoded modulation method that maximizes the mutual information of the modulation constraints

Method used

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  • Generation method of low-complexity pre-coding modulation matrix and pre-coding modulation method thereof
  • Generation method of low-complexity pre-coding modulation matrix and pre-coding modulation method thereof
  • Generation method of low-complexity pre-coding modulation matrix and pre-coding modulation method thereof

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Embodiment Construction

[0048] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0049] Such as figure 1 As shown, the low-complexity precoding modulation matrix generation method of the present invention includes the steps: a. The lower bound of the modulation constraint mutual information I L (P) Replace the modulation constraint mutual information I(P), which is difficult to calculate; b. Generate based on maximizing I L (P) Optimal precoding modulation matrix

[0050] Such as figure 2 As shown, consider having N t Transmitting antennas, N r MIMO system with two receiving antennas. Let x denote the input signal with zero mean unit covariance and H denote N r ×N t Channel matrix, n means that it satisfies CN(0,σ 2 I) distributed Gaussian noise, the received signal y can be expressed as

[...

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Abstract

The invention discloses a generation method of a low-complexity pre-coding modulation matrix and a pre-coding modulation method of the low-complexity pre-coding modulation matrix, wherein the generation method of low-complexity pre-coding modulation matrix comprises the steps of a, using a lower bound of modulation constraint mutual information to replace difficultly-computed modulation constraint mutual information; and b, generating an optimal pre-coding modulation matrix based on the maximum lower bound. In the invention, high data transmission capability is provided for a bandwidth wireless communication system with cognitive competence of electromagnetic environment and the demand of low computation complexity is met.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, and can be applied to a broadband wireless communication system with electromagnetic environment cognition ability, and particularly relates to a low-complexity precoding modulation matrix generation method and a precoding modulation method thereof. Background technique [0002] The great contribution of information theory is that it establishes the limit of the rate of information transmission with any low error probability in the communication channel. This limit is called the channel capacity. For a general multiple input multiple output (MIMO) system, the channel capacity is obtained under the condition that the transmitted signal is Gaussian. Affected by the research results of information theory, assuming that the transmitted signal has a Gaussian distribution, it has been a hot issue to study how to use precoding technology to increase the transmission rate of a communication sy...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L25/03
Inventor 陆建华曾维亮陶晓明肖承山
Owner TSINGHUA UNIV
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