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Cell same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof

A technology of IDMA and co-frequency networking, applied in transmission systems, digital transmission systems, baseband system components, etc., can solve problems such as inability to completely eliminate inter-cell interference, and avoid performance disadvantages, long space distances, The effect of rich resources of multiple addresses

Inactive Publication Date: 2011-02-09
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 same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof
  • Cell same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof
  • Cell same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof

Examples

Experimental program
Comparison scheme
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 OvCDMA+IDMA cells based on the three-color principle through the above-mentioned networking system, such as image 3 As shown, the steps are as follows:

[0032] (1) Three OvCDMA address codewords are generated by the OvCDMA codeword generator of the OvCDMA module. Based on the three-color principle of graph theory, three OvCDMA codes are used to form different-color cell networks; based on the coloring theorem of graph theory, three kinds of Different colors are used to distinguish adjacent cells, each cell is set as a regular hexagon, one of the cells is set as one color, and the six adjacent cells are arranged alternately with the other two colors to ensure Adjacent cells obtain different OvCDMA codeword resources; at this time, the multiplexing efficiency η of OvCDMA codeword OvCDMA =1 / 3, all cells are divided into 1 / η OvCDMA Group (color), each group is called a same-color cell group, which uses the same OvCDMA code word id...

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Abstract

The invention provides a cell same-frequency networking system combining an interleave division multiple access (IDMA) and an overlapped code division multiple access (OVCDMA) and a method thereof, belonging to the wireless communication network technical field. The system consists of a transmitting end and a receiving end. In the invention, neighboring cells are distinguished by means of orthogonality of an OvCDMA code word, and the homochromatic cells using the same OvCDMA code word are distinguished by an IDMA technology so as to eliminate homochromatic interference; and each cell can obtain the unique OvCDMA+IDMA cell exclusive code word, and the receiving end gives full play to the advantages of the IDMA and the OvCDMA by an iterative detection technology to eliminate the interference among the cells. In the invention, the interference between the neighboring cells is processed by the OvCDMA code word, thus achieving the purposes of eliminating the interference between the neighboring cells and simplifying the complexity of the OvCDMA technology; and the IDMA technology can help eliminate the interference among the homochromatic cells identified by the same OvCDMA code word and meet the networking demand of the homochromatic cells in larger quantity by means of the characteristics of rich multi-access resources of the IDMA technology.

Description

technical field [0001] The invention relates to a cell same-frequency networking system and method combining IDMA and OVCDMA, in particular to the same-frequency networking technology of a cellular cell, that is, a method and system for inter-cell interference elimination, 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 syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W16/14H04W16/18H04L25/02
Inventor 袁东风周晓天张海霞张彭
Owner SHANDONG UNIV
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