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Method and device for restraining inter-cell interference of high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access)

A technology of OFDM-IDMA and inter-cell interference, which is applied in the field of inter-cell interference suppression and can solve problems such as performance fading

Inactive Publication Date: 2013-01-30
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Interference cooperation techniques such as partial frequency reuse, inter-cell power control, and resource allocation schemes can achieve good performance when the system is under light and medium loads, but in a fully loaded system, the performance will have a strong decline

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  • Method and device for restraining inter-cell interference of high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access)
  • Method and device for restraining inter-cell interference of high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access)
  • Method and device for restraining inter-cell interference of high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access)

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Embodiment Construction

[0061] A kind of interference suppression receiving method based on OFDM-IDMA that the present invention proposes, concrete steps are as follows:

[0062] 1. If figure 1 As shown, it is a cell edge user in a 7-cell cellular system. Assume that the current user is in cell A, and the interference it receives comes from base stations in other 6 cells. Assume that all base stations have the same transmit power, and the path loss is inversely proportional to the square of the distance. The number of OFDM subcarriers is , the number of virtual subcarriers , the length of the cyclic prefix , each frame has 3 OFDM symbols, using 1 / 2 rate turbo coding, the generation matrix is , and the number of soft demodulation iterations is 5.

[0063] 2. If figure 2 As shown, the The bits sent by the cell to the user are , after turbo encoding, the encoding sequence is , after spreading code after getting , through the interleaver Get the frequency domain signal , in each...

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Abstract

The invention belongs to the field of the wireless communication technology and particularly relates to a method and a device for restraining inter-cell interference of a high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access). The invention adopts an OFDM signal sending and receiving system model based on IDMA; after being interwoven by an interweaver, a signal of a transmitter is modulated; and prior information of a received signal is updated by an ESE (Elementary Signal Estimator) estimator and a DEC (Direct Energy Conversion) decoder so as to reduce the interference. The device provided by the invention comprises a transmitter and a receiver for restraining inter-cell interference based on OFDM-IDMA. The method and the device provided by the invention can improve the anti-jamming capability of cell edge users in a heaver loading system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and device for inter-cell interference suppression based on OFDM-IDMA high-order modulation signals. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is the main technology of the next generation of wireless communication due to its high spectrum utilization and the ability to resist multipath effects. In order to obtain a higher spectrum utilization rate, the frequency reuse coefficient of the OFDM-based cell system is usually 1. Therefore, for the user's downlink transmission, it will inevitably cause inter-cell interference (ICI) in the cellular system. To reduce transmission reliability, especially the interference from multiple cells received by cell edge users, how to improve the anti-interference ability of edge cells is the main research topic at present. [0003] Several current interference m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L27/26
Inventor 刘俊周小林
Owner FUDAN UNIV
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