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Signal-space-alignment-based common-channel multi-user interference suppression method

A multi-user interference and signal space technology, which is applied in the field of wireless communication, signal space alignment optimization based on multi-user interference suppression, can solve the problem of signal space occupied by interference signals, low wireless network capacity and efficiency, and limited freedom of the system. problem, to achieve the effects of suppressing the impact on decoding, improving bandwidth utilization, and reducing decoding complexity

Inactive Publication Date: 2011-08-17
XIDIAN UNIV
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Problems solved by technology

This algorithm solves the problem of multi-user interference suppression under co-channel conditions, but because the interference signal occupies part of the signal space, the available degree of freedom of the system is limited; in a collaborative wireless network, signal interference greatly restricts the advantages of network coding, resulting in Low capacity and efficiency in wireless networks

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[0024] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] refer to figure 1 , in the existing multi-user MIMO system K-way relay channel, each of the K communication nodes has M antennas, and the relay node has N antennas. In the multiple access MAC stage of the first time slot, the i A communication node sends an independent information flow W to the relay node i , i ∈ [1, K], and in the BC phase of broadcast transmission in the second time slot, the signal sent by other communication nodes to the i-th communication node is received by the relay node j∈[1, K], j≠i; at a certain moment, information may be exchanged among all communication nodes.

[0026] Technical solution of the present invention uses figure 1 The above-mentioned existing wireless network, but different from the signal transmission method in the prior art, in the embodiment of the present inventio...

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Abstract

The invention discloses a signal-space-alignment-based common-channel multi-user interference suppression method, which mainly aims to solve the problem of common-channel multi-user interference. The method comprises that: in a multiple access stage in a first timeslot, a communication node transmits independent signals to other receiving communication nodes by a collaborative relay node, simultaneously receives signals from the other communication nodes, and performs signal space alignment on the signals expected to be subjected to network coding to reduce the number of independent information streams received by the relay node; and in a broadcasting transmission stage in a second timeslot, the collaborative relay node broadcasts and transmits the network coded signals, and each communication node eliminates interference signals in the broadcast signals by utilizing interface suppression beam forming, and decodes the network coded signals by utilizing own transmitted signals to obtain an estimated value of the signals expected to be received. By the method, the interference suppression technical advantages of the signal space alignment and the network coding are effectively fused, network capacity is increased, and bandwidth utilization rate is increased; and the method can be used for distributed transmission networks.

Description

technical field [0001] The invention belongs to the technical field of wireless networks, relates to signal space alignment and network coding technology, in particular to a signal space alignment optimization method based on multi-user interference suppression in a multi-user multi-antenna system, which can be used for wireless communication. Background technique [0002] The nodes in the wireless network have mobility and portability, which makes the establishment of the wireless network convenient and flexible, and has been widely used. The link of the wireless network has broadcast characteristics, that is, a node in the wireless network can broadcast information to other nodes, and similarly, a node in the wireless network can also receive information from other nodes. Due to the broadcast characteristics of nodes, if multiple nodes in the network broadcast at the same time, the multiple signals broadcast by multiple nodes will mix with each other in the free space of p...

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Application Information

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IPC IPC(8): H04L1/00H04L25/03
Inventor 王勇李晖张跃宇朱辉李小青张卫东王子龙李学俊党岚君吕锡香樊凯李凤华
Owner XIDIAN UNIV
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