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Fair relay selection method giving consideration to both rate and energy efficiency

A technology of energy efficiency and speed, applied in the field of communication, can solve the problem of not being able to optimize speed and energy, and achieve the effect of prolonging network survival time, improving performance and improving energy efficiency

Active Publication Date: 2016-09-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a fair relay selection method that takes both rate and energy efficiency into account in view of the comprehensive considerations that the rate and energy cannot be optimized in the prior art

Method used

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  • Fair relay selection method giving consideration to both rate and energy efficiency
  • Fair relay selection method giving consideration to both rate and energy efficiency
  • Fair relay selection method giving consideration to both rate and energy efficiency

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0035] The schematic diagram of the applicable system model of the present invention is as figure 1As shown, it includes a base station (Base station, BS) and L mobile stations (Mobile station, MS), all of which are equipped with a single antenna, and all users perform time division multiple access (TDMA) on the downlink broadcast channel Sharing, that is, the BS only sends data to one user in one transmission time slot, assuming that all MSs can serve as relay nodes to help other users forward data, and one relay can serve one user at most. Assuming that the system is in a working state of flat fading, both mobile users (Mobile station, MS) and relay nodes in the cell can obtain complete channel state information (CSI). Relay nodes use half-duplex communication. Each transmission slot (T S ) into α i (t)T S and (1-α i (t))T S Two parts, the cooperative method adopts decode and forward (DF), in α i (t)T S In the time slot, the BS sends data x to the relay k ; in (1-α ...

Embodiment 2

[0055] The fair relay selection method taking into account both rate and energy efficiency is the same as in embodiment 1, wherein, in step (3c), the MS k From BS to MS i The link rate and MS k with MS i The link rate, MS k Calculate and determine the time slot division factor α i The value of the time slot division factor α i Divide a transmission slot into two phases, in which, the first phase base station sends MS i Transmission data, the duration is α i T S , Phase II MS i to MS k Data transmission, the duration is (1-α i ) T S , T S is the length of a time slot:

[0056] When MS i When acting as a relay, the BS via the relay MS i To destination user MS k achievable speed Limited BS to MS i and MS i to MS k The poorer hop in the two-hop transmission, the poorer hop is also called the bottleneck of the link rate, and its expression is,

[0057] R k ...

Embodiment 3

[0065] The fair relay selection method taking into account the speed and energy efficiency is the same as the MS described in the embodiment 1-2, step (3d). k Get the MS according to the value of the slot division factor i When acting as a relay, the base station passes through the MS i to MS k The achievable transmission rate, the calculation steps of the achievable rate of the link are as follows:

[0066] When the bottleneck is eliminated, any formula in the following formula can be used to calculate the reachable rate of the link:

[0067] or

[0068] Among them, use h i,0 Indicates BS and MS i The channel state between (i∈Ω); use h k,i means MS i (i∈Ω) and MS k The channel state between; the transmit power of the base station is P T ;The power of relay forwarding data is P R ; N 0 Indicates the variance of Gaussian white noise; |·| 2 Represents the operation of finding the square of the modulus value; log 2 (·) means to find the base 2 logarithm operation...

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Abstract

The invention discloses a fair relay selection method which is used in a cooperative communication system and gives consideration to both rate and energy efficiency. The fair relay selection method comprises the steps that a destination user is selected; the destination user initializes a candidate relay set; the destination user traverses candidate relays and calculates the reachable rate when a base station transmits data to the destination user through the candidate relay; the destination user MSk calculates dispatching weights of all candidate relays and finally determines a selected relay; data transmission is carried out according to the selected relay; the destination user MSk directly receives data sent by the base station without relay cooperation; the destination user MSk adopts a proportional fairness algorithm to update the average transmission rate of all mobile users; and getting into the next transmission period at the completion of the current time slot, and repeating the above steps so as to complete fair relay selection. According to the invention, energy information is considered in relay dispatching weight, and nodes are prevented from excessively providing cooperation for the destination user, thereby improving the energy efficiency. Therefore, the life time of the system is enabled to be prolonged, and the method can be applied to relay selection in the cooperative communication system, and communication of users is ensured.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a fair relay selection method, in particular to a fair relay selection method taking into account speed and energy efficiency, which is used for relay selection in a cooperative communication system. Background technique [0002] In order to solve the limitations of traditional point-to-point wireless transmission in terms of system capacity, coverage and anti-multipath fading, and to make use of the space diversity provided by multi-antenna communication systems, cooperative communication (Cooperative communication) technology emerged as the times require. Using this technology, multiple single-antenna terminals cooperate with each other to form a virtual antenna array, thereby improving communication performance. Typical relay cooperation methods include Amplify-and-Forward (AF) and Decode-and-Forward (DF). [0003] In an actual cooperative communication system, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/30H04W48/06H04W48/20
CPCH04W36/30H04W48/06H04W48/20Y02D30/70
Inventor 李钊任晓慧肖丽媛丁汉清
Owner XIDIAN UNIV