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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, avoid performance disadvantages, eliminate interference, overcome The effect of sparse codewords

Inactive Publication Date: 2012-10-31
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] Example 1 of the present invention Figure 1-2 As shown, it consists of a transmitting end and a receiving end. The transmitting end is composed of a channel coding and modulation module 1, an IDMA module 2, an OvCDMA module 3, and a radio frequency transmitting module 4, which are connected in sequence. The IDMA module 2 includes an interleaving pattern generator 21 and an interleaving The OvCDMA module 3 includes an OvCDMA codeword generator 31 and an OvCDMA spreader 32; the receiving end includes a radio frequency receiving module 5, a channel estimator 6, an OvCDMA likelihood decoder 7, an IDMA signal estimator 8, an IDMA deinterleaving And channel decoding and demodulation module 11, including 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 modules 11 are connected in sequence, and the channel estimator 6 is connected to the OvCDMA likel...

Embodiment 2

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

[0028] (1) Transmitting 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 by the interleaver 22 using the interleaving pattern to obtain an interleaving signal; The OvCDMA code word generator 31 generates OvCDMA address code words, and the interleaved signal is spread by the OvCDMA spreader 32 using the OvCDMA address code words to obtain the final transmitted signal chip; the transmitted signal chip is transmitted to the wireless channel through the radio frequency transmitter module 4 ;

[0029] (2) Receiving end: The radio frequency receiving module 5 obtains the received signal from the wireless channel, and through the down-conversion processin...

Embodiment 3

[0031] A method of co-frequency networking of OvCDMA+IDMA cells based on the 3-color principle through the above 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, using three OvCDMA codes for heterogeneous cell networking; based on the coloring theorem of graph theory, three types are used Different colors distinguish adjacent cells, each cell is set to a regular hexagon, one of the cells is set to one color, and the six adjacent cells are set in alternate two colors to ensure that Adjacent cells obtain different OvCDMA codeword resources; at this time, the OvCDMA codeword reuse efficiency η 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 identification; assuming a wireless communication system wit...

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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 cellular cells, that is, a method and system for eliminating inter-cell interference, belonging to the technical field of wireless communication networks. Background technique [0002] Cellular systems are the most common networking structure for wireless mobile communications, and are widely used in the first to third generations of wireless communication standards. In this kind of system, the entire wireless service area is divided into multiple connected small areas according to the base station coverage capability, and each cell is served by a base station. In theory, 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 the actual system de...

Claims

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Application Information

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