Multi-cell zero-forcing interference suppression method

An interference suppression, multi-cell technology, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve the problem that the interference of multi-cell mobile communication systems cannot be completely eliminated, and is not suitable for large-scale application in actual communication systems. , the complexity of the tedious algorithm, etc., to achieve the effect of easy implementation, suppression of interference, and simple algorithm

Inactive Publication Date: 2013-03-20
SHANTOU UNIV
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Problems solved by technology

[0003] A solution in the prior art considers the problem of linear coordinated beamforming of downlink multi-cells, establishes a weighted sum rate function under the condition of satisfying the power constraints of the base station, derives the optimal beam structure and proposes a corresponding algorithm to solve the problem of beamforming vector, thereby suppressing the interference in the communication system; however, this technical solution is too cumbersome and involves a high degree of algorithm complexity, which is not suitable for large-scale application in actual c

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  • Multi-cell zero-forcing interference suppression method

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Embodiment 1

[0040] In this embodiment, taking the 4-cell cooperative system as an example, the channel fading factor β between the base station and the user is ik Both are set to 0.8, and the SNR of the system is defined as the average SNR of each receiving antenna at the user end, namely: where P represents the transmit power of each base station, Represents the noise variance; because each subcarrier is generally allocated to one user in the cell at a certain moment, the number of users can be set to be equal to the number of cells; the antenna pairs between the base station and the user are (8, 2), respectively.

[0041] A multi-cell zero-forcing interference suppression method as shown in Figure 1 in the flow chart mainly includes steps:

[0042] S1. Extract all channel information of the multi-cell communication system; in this embodiment, users send pilot signals to all base stations, and the base stations estimate and obtain all channel information according to the pilot signals...

Embodiment 2

[0072] In this embodiment, the coordinated system of 6 cells is taken as an example, and the channel fading factor β between the base station and the user is set ik Both are set to 0.6, and the antenna pairs between the base station and the user are (12, 2) respectively; other settings and operation steps are the same as those in Embodiment 1.

[0073] image 3 It is a performance comparison chart of the system and rate obtained by the method of the present invention and the technical solution based on singular value decomposition under the above circumstances; it can be seen that the method of the present invention is obviously better than the technical solution based on singular value decomposition, especially at low signal-to-noise ratio The gain is greater.

[0074] In summary, the present invention first uses the obtained channel information set at the base station to construct a joint matrix, uses singular value decomposition of the matrix to obtain the eigenvector set ...

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Abstract

The invention relates to the technical field of cooperative multipoint communication, in particular to a multi-cell zero-forcing interference suppression method. According to the multi-cell zero-forcing interference suppression method, a singular value decomposition method in the prior art is combined with rectangular projection transformation of a matrix, so that an optimal pre-coding matrix among various base stations and object users of the base stations is obtained, and the interference in a multiuser communication system is suppressed. Compared with a technical scheme based on beam forming, the multi-cell zero-forcing interference suppression method has the advantages of simple algorithm and easiness in realization; compared with a technical scheme based on singular value decomposition, the multi-cell zero-forcing interference suppression method increases the velocity of the system communication, and achieves very high communication quality even in an area with a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of coordinated multipoint communication, in particular to a multi-cell zero-forcing interference suppression method. Background technique [0002] The fourth-generation mobile communication system (LTE-A, Long Term Evolution Advanced) puts forward higher requirements in terms of communication system capacity, instantaneous peak data rate, cell edge user throughput, and delay. The main disadvantage of the traditional network topology is that there are problems such as interference and coverage quality degradation at the junction of the base station, resulting in poor performance of each terminal at the cell handover site; specifically, the performance of a multi-cell mobile communication system is usually affected by the inter-user Limitation of interference becomes an interference-limited system, especially when the user is at the edge of the cell. In order to meet the requirements of the LTE-A communicatio...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 周雯范立生王军李旭涛
Owner SHANTOU UNIV
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