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D-OFDMA (Dual-Orthogonal Frequency Division Multiple Access) cellular system based on angular multiplexing

A cellular system, angle division technology, applied in multi-frequency code system, baseband system components, shaping network in transmitter/receiver, etc.

Inactive Publication Date: 2013-05-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these technologies fundamentally solve the problem, but only improve the communication quality of cell edge users by sacrificing frequency domain resource utilization or sacrificing central user performance.

Method used

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  • D-OFDMA (Dual-Orthogonal Frequency Division Multiple Access) cellular system based on angular multiplexing
  • D-OFDMA (Dual-Orthogonal Frequency Division Multiple Access) cellular system based on angular multiplexing
  • D-OFDMA (Dual-Orthogonal Frequency Division Multiple Access) cellular system based on angular multiplexing

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Embodiment Construction

[0109] Below in conjunction with accompanying drawing and example the present invention is further described.

[0110] According to the discussion of the content of the invention above, in conjunction with the following figure 1 and figure 2 The specific implementation of the D-OFDMA cellular system based on FrFT angle division multiplexing is summarized as follows. In order to focus on the implementation of the key parts involved in the present invention, in the following description, we still describe the equivalent baseband system, omitting links such as radio frequency modulation and sampling in the actual system. At the same time, for the convenience of illustration, it is assumed that the target user accesses the cell 1 .

[0111] For the D-OFDMA cellular system based on FrFT angle division multiplexing, first determine the number of FrFT angles (that is, select several FrFT angles to allocate between cells) when performing network planning, and then follow (34) or (...

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Abstract

The invention provides a D-OFDMA (Dual Orthogonal Frequency Division Multiple Access) cellular system based on angular multiplexing, aiming at a root reason for forming ICI (Inter-Cell Interference) in a traditional OFMDA cellular system, which is that all cells have identical modulation basis functions on the same subcarrier. The invention provides the D-OFDMA cellular system based on FrFT (Fractional Fourier Transform) angular multiplexing and realizes the orthogonality of the modulation basis functions on different subcarriers in the cells and the approximate orthogonality of the modulation basis functions of adjacent cells on the same subcarrier by optimally distributing an FrFT angle as a resource in all the cells in the cellular system. Accordingly, a target user receiving end can carry out MMSE (Multiuse Mission Support Equipment) balance and relative detection in an FrFT domain of a corresponding angle of each service cell to effectively suppress the ICI and improve the cell margin throughput.

Description

Technical field: [0001] The invention relates to the technical fields of multi-carrier communication, inter-cell interference elimination and coordination, and the like. Background technique: [0002] With the increasing transmission rate requirement in wireless communication, multi-carrier transmission technology is being researched and applied more and more in recent years. Multi-carrier technology transmits data by dividing a high-speed data stream into several parallel bit streams, so that each channel has a much lower bit rate, and the data on each sub-channel is modulated by a different carrier. Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier modulation technology with equally spaced frequency overlap. OFDM technology itself and the technology combined with other communication systems have become one of the most important development directions and technologies in the field of high-speed data transmission technology in the future. trend. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 王会琦吕王勇寸红强马洪钟苏川彭皓
Owner SICHUAN UNIV