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Cell co-frequency networking method combining IDMA and OVCDMA

A technology of IDMA and co-frequency networking, which is applied in the direction of digital transmission system, baseband system components, error prevention, etc., can solve the problem that the inter-cell interference cannot be completely eliminated, and achieve the effect of eliminating interference and improving spectrum efficiency

Active Publication Date: 2013-04-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

IDMA uses an interleaver as a multiple access resource, with rich code resources and a relatively simple decoding method. It can be used as a multiple access solution between cells in large-scale networking, but IDMA cannot completely eliminate inter-cell interference.

Method used

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  • Cell co-frequency networking method combining IDMA and OVCDMA
  • Cell co-frequency networking method combining IDMA and OVCDMA
  • Cell co-frequency networking method combining IDMA and OVCDMA

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 of the present invention such as Figure 1-2 As shown, it is composed of a sending end and a receiving end. The sending end is connected in sequence by a channel coding and modulation module 1, an IDMA module 2, an OvCDMA module 3 and a radio frequency transmitting module 4, wherein the IDMA module 2 includes an interleaving pattern generator 21 and an interleaving pattern generator 21. Device 22; OvCDMA module 3 includes OvCDMA codeword generator 31 and OvCDMA spreader 32; Receiver includes radio frequency receiving module 5, channel estimator 6, OvCDMA likelihood decoder 7, IDMA signal estimator 8, IDMA deinterleaving Device and interleaver group 9,10 and channel decoding and demodulation module 11, wherein radio frequency receiving module 5, OvCDMA likelihood decoder 7, IDMA signal estimator 8, IDMA deinterleaver and interleaver group 9,10 and channel The decoding and demodulation module 11 is sequentially connected, and the channel estimator 6 is respec...

Embodiment 2

[0027] A method for transmitting information between the sending end and the receiving end of the above-mentioned system, the steps are as follows:

[0028] (1) Sending end: the user signal is channel-coded and modulated by the channel coding and modulation module 1 to obtain a modulated complex signal; the interleaving pattern generator 21 generates an interleaving pattern, and the modulated signal is interleaved through the interleaver 22 using the interleaving pattern to obtain an interleaving signal; The OvCDMA code word generator 31 generates the OvCDMA address code word, and the interleaved signal utilizes the OvCDMA address code word to implement spreading by the OvCDMA frequency spreader 32 to obtain the final transmitted signal chip; the transmitted signal chip is transmitted to the wireless channel through the radio frequency transmission module 4 ;

[0029] (2) receiving end: radio frequency receiving module 5 obtains received signal from wireless channel, and throu...

Embodiment 3

[0031] A method for co-frequency networking of the OvCDMA+IDMA community based on the 4-color principle by the co-frequency networking system of the above-mentioned united IDMA and OvCDMA, the steps are as follows:

[0032] (1) Generate 4 OvCDMA address codewords by the OvCDMA codeword generator of the OvCDMA module, based on the 4-color principle of graph theory, use 4 OvCDMA codes to carry out heterochromatic cell network design; based on the coloring theorem of graph theory, for each A network composed of regular hexagons, one of which is set in one color, and the six adjacent areas are set in the other three colors, and the two adjacent areas on the symmetrical side The color of is the same color, can guarantee to distinguish adjacent sub-districts with 4 kinds of colors like this; At this moment, the multiplexing efficiency η of OvCDMA code word OvCDMA =1 / 4, all cells are divided into 1 / η OvCDMA Group (color), each group is called a same-color cell group, which uses the ...

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Abstract

A cell co-frequency networking method combining IDMA and OVCDMA belongs to the technical field of the wireless communication network. The system of the invention consists of a sending end and a receiving end. The invention utilizes the orthogonality of the OVCDMA code word to distinguish neighboring cells, the IDMA technology is used to distinguish same-color cells using the same OVCDMA code word and perform same-color interference elimination; each cell can obtain the special code word for the OVCDMA-IDMA cell; and the receiving end utilizes the iterative detection technology so as to make full use of the advantages of the OVCDMA and IDMA and eliminate the interferences between cells. In the method of the invention, the OVCDMA code word is adopted to process the interferences of the neighboring cells, thus eliminating the interferences between cells and simplifying the complexity of the OVCDMA technology; and the IDMA technology is utilized to process the interferences of same-color cells identified by the same OVCDMA code word, thus eliminating same-color interferences, utilizing the characteristic of rich multiple access resources and meeting the networking requirements of a large number of same-color cells.

Description

technical field [0001] The invention relates to a cell same-frequency networking method combining IDMA and OVCDMA, in particular to the same-frequency networking technology of a cellular cell, that is, a method and system for eliminating inter-cell interference, and belongs to the technical field of wireless communication networks. Background technique [0002] The cellular system is the most common networking structure for wireless mobile communications, and is widely used in the first to third generation wireless communication standards. In this system, according to the coverage capability of the base station, the entire wireless service area is divided into multiple connected small areas, and each cell is served by a base station. Theoretically, the cell is constructed as a hexagon to minimize the number of base stations covering the entire service area. The shape of this system is like a honeycomb, so it is called a cellular system. Of course, in actual system design, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7107H04L1/00H04L25/02
Inventor 张海霞周晓天袁东风张彭
Owner SHANDONG UNIV
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