Construction device of multi-dimensional similar-orthogonal pseudo-random extended matrix

An extended matrix, pseudo-random technology, used in multiplexing communications, code division multiplexing systems, electrical components, etc.

Inactive Publication Date: 2010-06-23
NANJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

Due to the limited size of the H matrix (n≤200), the number of users is limited in multiple access technology, that is, the number of users cannot exceed 200, which limits the number of channels and users to a large extent

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  • Construction device of multi-dimensional similar-orthogonal pseudo-random extended matrix
  • Construction device of multi-dimensional similar-orthogonal pseudo-random extended matrix
  • Construction device of multi-dimensional similar-orthogonal pseudo-random extended matrix

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Embodiment Construction

[0061] specific implementation plan

[0062] The device of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0063] Such as figure 1 As shown, the device for constructing the multi-dimensional orthogonal quasi-pseudo-random extended matrix is ​​composed of a multi-dimensional quasi-orthogonal pseudo-random matrix constituting unit and an expanding unit.

[0064] The multi-dimensional orthogonal pseudo-random matrix constitutes a unit, consisting of n coefficient registers A i (i=1, 2,..., n), coefficient convolution device, polynomial register, group conversion shift register, multiplier, modulo 2 adder, memory, counter, matrix converter and numerical converter constitute; The n coefficients of the original polynomial are respectively stored in the coefficient register A i Middle; n coefficient registers A iRespectively connected to the input of the coefficient convolution device; the coefficie...

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Abstract

The invention relates to a construction device of a multi-dimensional similar-orthogonal pseudo-random extended matrix, which consists of multi-dimensional similar-orthogonal pseudo-random matrix construction units and an extension unit; a multi-dimensional similar-orthogonal pseudo-random matrix consists of the multi-dimensional similar-orthogonal pseudo-random matrix construction units; then a similar-orthogonal PN matrix after filtration and a completely orthogonal PN' matrix are constructed by a first-stage comb filter of the extension unit, the direct product operation is further carried out by a PN-PN' direct product operation device, and a PN-PN' matrix is constructed; and completely orthogonal column vectors or row vectors are finally filtered out by a second-stage comb filter. The adoption of the device can realize simple circuit structure and simple construction method of an MSPE matrix, and the constructed MSPE matrix has excellent similar-orthogonal property, pseudo-random property and a wide range of applications. The column vectors of the PN-PN' matrix after extension can be taken as channel codes, and the row vectors can be taken as user codes in a CDMA communication system. An application in AdHoc uses the MSPE matrix for differentiating a base station, and the column vectors and the row vectors in the matrix are simultaneously applied as the channel codes and the user codes for each base station.

Description

technical field [0001] The invention relates to a device for forming a multi-dimensional orthogonal pseudo-random spreading matrix. The multi-dimensional orthogonal pseudo-random spreading matrix is ​​a spreading code applicable to a CDMA communication system and belongs to the technical field of mobile communication. Background technique [0002] For the CDMA system, it mainly has four kinds of interferences: local interference, intersymbol interference, multiple access interference, and leading channel interference. Generally speaking, when the correlation characteristics of the spread spectrum sequence in the CDMA system are better, that is, the autocorrelation of the sequence is stronger and the cross-correlation is weaker, the less interference the system receives. Among the above four types of interference, except for local interference, the rest of the interference can be reduced or even eliminated by selecting a spread spectrum sequence with relatively good correlati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/04
Inventor 查艳芳殷奎喜吴游刘学军
Owner NANJING NORMAL UNIVERSITY
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