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Relay selection method and device for full-duplex relay system

A relay system, full-duplex technology, applied in the direction of electrical components, wireless communication, etc., can solve problems such as inability to guarantee user service quality, affect system performance, and fail to meet the requirements of full-duplex relay system relay selection, etc. Achieve the effect of improving system performance and user service quality, improving system performance, and reducing channel state information

Inactive Publication Date: 2017-09-01
BEIJING HUITONG JINCAI INFORMATION TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the relay selection can also be realized by using the AF protocol, the AF relay node only amplifies the received signal according to a specific coefficient and forwards the amplified signal without any other processing on the signal, so the amplified signal of the relay node not only contains valid signals , also contains a certain amount of noise, this part of the amplified noise signal will affect the performance of the system together with the noise received by the next hop
In DF relay, although it is assumed that the self-interference is constant fading simplifies the analysis process, the actual self-interference is constantly changing, and the output of the relay node is a Rayleigh distribution for the input self-interference channel link fading coefficient Random process, cannot guarantee the user's service quality
Obviously, the existing technologies based on the AF protocol and the DF protocol can no longer meet the requirements of relay selection in a full-duplex relay system

Method used

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  • Relay selection method and device for full-duplex relay system
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  • Relay selection method and device for full-duplex relay system

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Embodiment 1

[0048] see figure 1 It is a schematic flowchart of a relay selection method for a full-duplex relay system provided in Embodiment 1 of the present invention, and see figure 2 A schematic structural diagram of a full-duplex relay system provided by an embodiment of the present invention, the full-duplex relay system includes a source node S, a destination node D, multiple relay nodes R, and a link between the source node and the relay node channel link h SR , the channel link h from the relay node to the destination node RD and the relay node self-interference channel link h RR .

[0049] Specifically, in a full-duplex relay system, it includes a source node (Source), a destination node (Destination) and N DF relay nodes (R k ,k∈{1,2,…,N}). Because the direct link between the source node and the destination node is subject to strong fading, the signal can only be transmitted through relay forwarding. Among them, the source node and the destination node are equipped with ...

Embodiment 2

[0062] Referring to embodiment one of the present invention and figure 1 The specific process of steps S11 to S14 described in the above, in Embodiment 2 of the present invention, the relay selection method of the full-duplex relay system further includes:

[0063]After determining the relay selection scheme of the actual full-duplex relay system, the actual full-duplex relay system is adjusted by setting different relay numbers in the actual full-duplex relay system The outage probability is analyzed, the number of relays corresponding to the minimum outage probability is determined, and corresponding relay deployment is performed on the actual full-duplex relay system according to the number of relays.

[0064] It can be understood that by setting different numbers of relays in the same scene to analyze the interrupt performance, find the optimal number of relay selection N, because when the number of relays is greater than N, the interrupt performance does not increase furt...

Embodiment 3

[0137] Corresponding to the relay selection method of the full-duplex relay system disclosed in Embodiment 1 and Embodiment 2 of the present invention, Embodiment 3 of the present invention also provides a relay selection device for a full-duplex relay system, see Figure 5 A schematic structural diagram of a relay selection device for a full-duplex relay system provided in Embodiment 3 of the present invention, the device includes:

[0138] The preset module 1 is configured to preset four relay selection schemes based on the DF protocol and according to the channel state information of the channel link in the full-duplex relay system, wherein the four relay selection schemes include One optimal relay selection scheme and three suboptimal relay selection schemes;

[0139] Calculation module 2 is used to analyze and calculate the four kinds of relay selection schemes according to the system outage performance theory of the independent and identically distributed Rayleigh fadin...

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Abstract

The invention discloses a relay selection method and device for a full-duplex relay system. The method comprises the steps of: on the basis of a DF protocol, pre-setting an optimal relay selection scheme and three sub-optimal relay selection schemes according to channel state information in the full-duplex relay system; performing analytical calculation of the four relay selection schemes, so that the interruption probabilities corresponding to the various relay selection schemes are respectively obtained; performing simulated analysis of simulation factors by adopting a computer, so that the performance states of the four relay selection schemes under the practically measured channel environment are obtained; and, selecting one sub-optimal relay selection scheme, the performance state of which is closet to the performance state of the optimal relay selection scheme in the three sub-optimal relay selection schemes, as the practical relay selection scheme in the full-duplex relay system. The purposes of effectively improving the system performance and the user service quality and saving the equipment cost can be achieved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a relay selection method and device for a full-duplex relay system. Background technique [0002] In recent years, collaborative communication technology has received extensive attention from researchers all over the world. Cooperative communication is a new type of space diversity technology, which can be regarded as a communication principle similar to MIMO (Multiple Input Multiple Output technology). Using the broadcast characteristics of wireless communication channels, users cooperate with each other to achieve distributed transmission and Information processing constitutes a virtual distributed antenna array to obtain higher system capacity and spectrum utilization efficiency while expanding coverage. In a collaborative communication system, due to the advantages of low component cost and flexible layout, relay technology is usually used to achieve h...

Claims

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Application Information

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IPC IPC(8): H04W40/12H04W40/22
CPCH04W40/12H04W40/22
Inventor 王俊生李丽丽何清素徐彧崔九鑫
Owner BEIJING HUITONG JINCAI INFORMATION TECH
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