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Limiting feedback precoding interference suppression method of multi-antenna multi-cell system

An interference suppression, multi-cell technology, applied in diversity/multi-antenna system, radio/induction link selection arrangement, space transmit diversity, etc., can solve the problem of transceiver synchronization, high complexity of base station optimal joint coding, disadvantageous system, etc. question

Inactive Publication Date: 2008-04-09
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Although base station cooperation can improve the spectral efficiency of the system, due to the extremely high complexity of the optimal joint coding between base stations, the synchronization between transceivers is very difficult; and the base station needs to know the channel information of all users, when the number of users in the cell is large Requires high feedback information, which is not conducive to the practical implementation of the system

Method used

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  • Limiting feedback precoding interference suppression method of multi-antenna multi-cell system
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  • Limiting feedback precoding interference suppression method of multi-antenna multi-cell system

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Embodiment Construction

[0033] As shown in FIG. 1 , this embodiment considers a multi-cell system, and the frequency reuse factor of the cell is 1. At most one mobile user communicates with the base station in each cell at each moment, assuming that the interference signals received by users in the cell mainly come from the base stations of three adjacent co-frequency cells, and each base station uses a precoding matrix to suppress its interference Interference generated by three adjacent co-frequency cells. The number of antennas configured for each base station is M=8, and the number of antennas for each user is N=2. Codebook set for each base station and user Both sizes are 32. The channels between all transmit and receive antenna pairs are flat Rayleigh fading. The implementation process of an interference suppression algorithm using limited feedback precoding technology is as follows:

[0034] (1) Establish the codebook set of the base station and the user end

[0035]All base stations and...

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Abstract

The invention discloses a limited-feedback precoding interference-suppression method in a multi-antenna multi-cell system. The transmitting terminal has a base station, the receiving terminal has a mobile user, and both the base station and the user are equipped with an identical codebook collection; at the receiving terminal, the mobile user firstly measures the interference channel between the mobile user-self and the co-frequency base station of the adjacent cell, then qualifies the interference channel by using the codebook collection, and feedbacks the qualified data to the base station of the adjacent cell; at the transmitting terminal, the base station of the adjacent cell uses the feedback data to perform the precoding processing, generates a percoded matrix, and then suppresses the interference to other cells caused by the adjacent cell; when all the base station in the multi-cell system use the same processing method, the co-frequency interference in the system will be effectively suppressed. The invention uses the precoding technology of the receiving terminal to suppress the interference to other adjacent cells caused by the base station, at the same time, uses the limited codebook collection to realize the limited information feedback, achieving the goals of suppressing interference, enhancing system performance and increasing system capacity.

Description

technical field [0001] The invention belongs to the technical field of multi-antenna and multi-cell interference suppression in mobile communication, and in particular relates to the problem of suppressing same-frequency interference of adjacent cells in a multi-cell communication environment in a multiple-input multiple-output (MIMO) system using multi-antenna technology. Background technique [0002] The MIMO system uses multiple antennas at both the transmitting end and the receiving end. In a rich scattering environment, information theory has proved that the MIMO system can obtain a very high channel capacity. An effective method to improve the transmission rate and spectrum utilization. With the emergence and maturity of broadband wireless communication systems such as broadband wireless access system (IEEE802.16) and China's third-generation wireless communication system (FUTURE Beyond3G), how to successfully apply MIMO technology to actual multi-cell wireless communi...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04Q7/36
Inventor 刘乃金邱玲朱近康
Owner UNIV OF SCI & TECH OF CHINA
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