Power allocation method for asymmetric two-way relay channel based on outage probability analysis

A two-way relay and probability analysis technology, applied in power management, location diversity, wireless communication, etc., can solve the problems of two-way relay amplification and forwarding protocol interruption probability performance that have not been reported.

Inactive Publication Date: 2017-03-22
HARBIN ENG UNIV
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Problems solved by technology

However, the outage probability performance of bidirectional relay-amplify-and-forward protocols for asymmetric channel conditions has not been reported

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  • Power allocation method for asymmetric two-way relay channel based on outage probability analysis
  • Power allocation method for asymmetric two-way relay channel based on outage probability analysis
  • Power allocation method for asymmetric two-way relay channel based on outage probability analysis

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Embodiment Construction

[0081] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0082] refer to figure 1 , the present invention realizes steps as follows:

[0083] Step 1: Establish a traditional three-node two-way relay communication system model, and initialize the information of each node;

[0084] (1.1) Firstly, the traditional three-node two-way relay communication system model is given. The relay node adopts the amplification and forwarding protocol. The system modeling is as follows: figure 2 . In the figure, it is assumed that the two user nodes do not have a channel for direct communication, and the user node S 1 with user node S 2 The signals are transmitted to each other through the relay R. Node S 1 The signal broadcast to the other party is x 1 , node S 2 The signal broadcast to the other party is x 2 . Assuming that the channel has reciprocity, h and f are S 1 -R channel with S 2 - The...

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Abstract

The invention provides a power allocation method for an asymmetric two-way relay channel based on outage probability analysis. The method comprises the following steps: 1) establishing a conventional three-node two-way relay communication system model, and carrying out initialization on each node power; 2) introducing asymmetric factors into the conventional three-node model, and having four kinds of asymmetric situations; 3) calculating system outage probability under the four kinds of asymmetric situations, and making comparison; 4) carrying out segment processing on the outage probability of the system under the downlink asymmetric situation; and 5) with the system outage probability serving as an objective function, and total power serving as constraint conditions, carrying out adaptive power resource allocation according to a power allocation scheme, where the objective function is minimum. The method can allocate power values of the user nodes according to channel state information; the power allocation value is a segmented function related to the asymmetric factors; and the nodes can adjust transmitting power adaptively according to change of the channel states, thereby improving outage performance of the asymmetric channel communication system.

Description

technical field [0001] The invention designs a power distribution method in the technical field of wireless communication, and in particular relates to a power distribution method of an asymmetric two-way relay channel. Background technique [0002] Cooperative relay technology, as an extension of multi-antenna technology, has become a research hotspot through the formation of virtual MIMO technology to obtain cooperative diversity and expand the range of signal transmission. Two relay protocols, amplify-and-forward (AF) and decode-and-forward (DF), have shown that sharing user antennas through relay can increase system capacity and reduce system variation with channel sensitivity. However, due to the half-duplex limitation of practical communication systems, cooperative relay also brings about the loss of spectrum efficiency while improving wireless transmission performance. For this reason, a two-way relay transmission scheme that only needs two time slots to complete in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34H04W52/44H04W52/46
CPCH04W52/346H04B7/026H04W52/44H04W52/46
Inventor 国强孙嘉遥
Owner HARBIN ENG UNIV
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