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Method and device for realizing OFDM (orthogonal frequency segmentation multiplexing) sidelobe suppression based on pre-coding

A sidelobe suppression and precoding technology, which is applied in the direction of multi-frequency code system, modulated carrier system, baseband system components, etc., can solve the problems of reducing spectrum utilization and increasing system complexity, so as to increase implementation complexity and suppress Interference, to achieve the effect of side lobe suppression

Inactive Publication Date: 2015-03-04
ZHEJIANG UNIVIEW TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing sidelobe suppression method will reduce the spectrum utilization rate and increase the system complexity, and provide a method and device for realizing OFDM sidelobe suppression based on precoding

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  • Method and device for realizing OFDM (orthogonal frequency segmentation multiplexing) sidelobe suppression based on pre-coding
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  • Method and device for realizing OFDM (orthogonal frequency segmentation multiplexing) sidelobe suppression based on pre-coding

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Embodiment Construction

[0042] QPSK / 16QAM mapping is performed on the source data, and inverse Fourier transform is performed. Assume that the source generates M mutually independent and memoryless source vectors, denoted as c, namely:

[0043] c=[c 0 ,...,c M-1 ] T

[0044] Denote the source vector after the precoding module as d, namely:

[0045] d=Gc

[0046] In the formula, G is an N×M precoding matrix. The problem to be solved by the present invention is to obtain the precoding matrix G.

[0047] After inverse Fourier transform and cyclic prefix insertion, an OFDM symbol can be expressed as:

[0048] s=[s 0 ,...,s K-1 ] T

[0049] In the formula, K represents the number of OFDM subcarriers contained in one OFDM symbol, so any element in s can be expressed as:

[0050] S k = 1 N Σ n = 0 N c ...

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Abstract

The invention discloses a method and a device for realizing OFDM (orthogonal frequency segmentation multiplexing) sidelobe suppression based on pre-coding. The method comprises the following steps: firstly, determining an interference matrix corresponding to a target frequency range according to the Fourier transform matrix corresponding to the target frequency range set by a user; then, determining a pre-coding matrix after performing singular value decomposition on the interference matrix, and pre-coding information source data according to the pre-coding matrix to realize sidelobe suppression. The method disclosed by the invention can be used for realizing generating a frequency spectrum groove which is deep enough on the target frequency range on the condition of not lowering the frequency range utilization rate and not increasing the hardware, so that the interferences of a secondary user on a master user is suppressed to the greatest extent.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for realizing OFDM sidelobe suppression based on precoding. Background technique [0002] In recent years, with the continuous growth of wireless services, spectrum resources have become increasingly scarce. In order to effectively utilize precious spectrum resources and improve spectrum utilization, cognitive radio and spectrum pool technologies are introduced. Combining cognitive radio technology with some digital communication technology can enhance the utilization of vacant frequency bands and effectively alleviate the problem of spectrum resource shortage. The OFDM technology has the advantages of high spectrum utilization rate and strong anti-multipath fading ability. Therefore, the combination of OFDM technology and cognitive radio technology can effectively improve spectrum utilization. However, due to the presence of adjacent channel interfe...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
CPCH04L27/2628H04L27/2691
Inventor 肖海林许旻胡静贺栋梁胡立坤侯嘉
Owner ZHEJIANG UNIVIEW TECH