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A method and device for iteratively suppressing interference between neighboring cells

A technology of inter-cell interference and adjacent cell interference, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve problems such as large limitations and performance fading, and achieve the effect of reducing interference and improving anti-interference ability.

Inactive Publication Date: 2018-07-27
FUDAN UNIV
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Problems solved by technology

When using interference cancellation, the adjacent cells need to maintain synchronization, and the target cell must know the pilot structure of the interfering cell in order to perform channel estimation on the interfering signal, which has great limitations
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

Method used

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  • A method and device for iteratively suppressing interference between neighboring cells
  • A method and device for iteratively suppressing interference between neighboring cells
  • A method and device for iteratively suppressing interference between neighboring cells

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Embodiment Construction

[0050] A kind of interference suppression receiving method based on OFDM-IDMA that the present invention proposes, concrete steps are as follows:

[0051] Such as 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.

[0052] The OFDM-IDMA receiver with BPSK code is used for Monte Carlo simulation to compare the performance of the system under Gaussian white noise channel conditions. First consider that the transmit power of each base station is the same, and the channel fading is inversely proportional to the square of the distance. When the user is at the edge of the cell, consider the bit error situation generated when it receives signals with different signal-to-noise ratios for simulation. The signal-to-...

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Abstract

The invention belongs to the technical field of wireless communication, in particular to an iterative inter-cell interference suppression method and device based on optimal Bayesian. The method and the device employ an OFDM (Orthogonal Frequency Division Multiplexing) signal transmission and receiving system model based on IDMA (Interleave-Division Multiple Access), signals are interleaved and modulated by an interleaver in a transmitter and then transmitted, prior information of the received signals are updated by an optimal Bayesian detection algorithm via an MUD (master user directory) and DEC (data exchange control) decoder in a receiver, the interference reduced, and soft demodulation of the signals is achieved. The device comprises an iterative inter-cell interference suppression transmitter and a receiver based on the optimal Bayesian. The method and the device can improve interference resistance of users at the edge of a cell in a heavier load system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and a device for iterative adjacent cell interference suppression based on optimal Bayesian. Background technique [0002] OFDM is Orthogonal Frequency Division Multiplexing, a type of multi-carrier modulation, and a powerful transmission technology under Raleigh fading channels. The basic principle of OFDM is to divide a broadband channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. The transmission bandwidth is divided into a series of orthogonal subcarrier resources, and different subcarrier resources are allocated to different users to realize multiple access. Because the subcarriers are orthogonal to each other, there is no interference between users in a single cell. However, signals of the same frequency are multipl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/00H04B1/10
CPCH04L27/2691
Inventor 许翰周小林
Owner FUDAN UNIV
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