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Method for composing multidimensional quadrature pseudo-random matrix

A pseudo-random and matrix technology, applied in the field of mobile communication, can solve complex and cumbersome engineering applications

Inactive Publication Date: 2009-04-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Different sequence generators are used for the address code and scrambling code of a DS-CDMA communication system; it will be complicated and cumbersome in engineering applications

Method used

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  • Method for composing multidimensional quadrature pseudo-random matrix
  • Method for composing multidimensional quadrature pseudo-random matrix
  • Method for composing multidimensional quadrature pseudo-random matrix

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Embodiment Construction

[0035] specific implementation plan

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] The method for forming the multi-dimensional pseudo-random matrix of the present invention is to combine primitive polynomials to form a pseudo-random matrix through group transformation. A device for constructing a multi-dimensional orthogonal pseudo-random matrix, consisting of n registers A i (i=1~n), convolution device, register B, shift register, multiplier, modulo 2 adder, memory, counter, converter.

[0038] First, the coefficients of the primitive polynomials are placed in registers, and n primitive polynomials are represented by n registers Ai. Connect n registers to the input of the convolution device; the convolution device realizes the convolution operation, and the output is placed in register B; the output of register B is connected to the input of the shift register; the highest bit of the shift re...

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Abstract

The invention discloses a constructive method of a multi-dimensional orthogonal paseudorandom matrix, which is applied to spread spectrum of a CDMA system. The steps of the method are as follows: primitive polynomials, f1, f2, L, fn are screened and combined according to requirements, and fn representation sequences after being screened and assembled are constructed into orthogonal paseudorandom matrix M through group translating in a buffer memory; threshold values are set, then through row comb filters and column comb filters, mutual orthogonal excellent code blocks are selected out from the matrix as permissible codes, and remaining forbidden codes are filtered. The multi-dimensional orthogonal paseudorandom matrix of the invention is characterized by simple method and circuit structure. Sequence sets in the matrix have good orthogonal property, paseudorandom property and ultra-large scale property. The multi-dimensional orthogonal paseudorandom matrix M is applied in the CDMA, which uses column vectors as channel coding; code division multiple access is applied in the CDMA, and row vectors are used as user codes. Simultaneously, the invention can also be used in Ad Hoc, and the matrix is used for dividing base stations and the column vectors and the row vectors in the matrix are used as the channel coding and user codes in every base station simultaneously.

Description

technical field [0001] The invention relates to a method for forming a spreading code-multidimensional orthogonal pseudo-random matrix applied in a DS-CDMA communication system, and belongs to the technical field of mobile communication. Background technique [0002] There are four types of interference to CDMA systems: local interference, intersymbol interference, multiple access interference, and adjacent channel interference. In addition to local noise, the other three types of interference can be reduced or even eliminated by selecting spread spectrum sequences with excellent correlation characteristics. In general, the better the correlation properties of the sequence set, the less interference the system will have. The capacity of the CDMA system is mainly limited by interference, and has the characteristics of soft capacity and large capacity. This is different from the traditional wireless multiple access technology TDMA and FDMA. The system capacity of the latter t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/04H04J13/12
Inventor 赵华殷奎喜吴游闾国年张羽
Owner NANJING NORMAL UNIVERSITY
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