Comprehensive relay node selection method based on multiple factors in two-hop system with multiple relays
A relay node and relay system technology, applied in the direction of advanced technology, access restrictions, electrical components, etc., can solve problems such as the superiority of the relay selection algorithm
Inactive Publication Date: 2013-02-06
BEIJING UNIV OF TECH
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[0004] In "Research on Diversity Transmission of Broadband Cooperative Communication" and "Performance Analysis of Two-Hop Multi-point Cooperative Relay Communication System" and other related documents, there are more in-depth introductions to the relay cooperative communication method, but the previous literature is on each node. The power of all adopts the scheme of equal distribution, which affects the superiority of the relay selection algorithm
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[0046] The technical solution of the relay node selection method of the source node cooperative communication cooperative relay based on LTE uplink SC-FDMA is realized according to the following process:
[0047] In step (1), the channel between the source user and the base station cannot communicate directly, and a relay user needs to cooperate with the source user to transmit information. Among them, the number of potential idle relays in the network is assumed.
[0048] Step (2), calculating the theoretical value of end-to-end capacity in the network with relay cooperation. Proceed as follows:
[0049] Step (2.1), calculate the channel capacity between the source user and the relay user, each user is assigned a unique orthogonal multiple access channel, adopt the DF relay cooperation mode, and all relay nodes work in half-duplex model. In the process of completing a complete cooperative communication, it is divided into two stages: in the first stage, the source node use...
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A comprehensive relay node selection method based on multiple factors in a two-hop system with multiple relays is used in the technical field of 3GPP (The 3rd Generation Partnership Project) long term evolution uplink oriented cooperative communication systems, and is characterized in that carrying capacity of a channel between a source node and a relay node is calculated one after another; the minimum value of the carrying capacity calculated one after another is taken as the total capacity of a system simultaneously using M spare nodes; and then calculation by using Lagrange multiplication is carried out under the condition of guaranteeing the maximized capacity of a second hop to perform power matching optimization, so as to obtain the optimum power distribution coefficient of each relay node by calculating. The invention has the advantages that system capacity maximization method is used to comprehensively consider capacity changes among the relays, the matching of the system capacity is achieved, and the objective optimization of the power distribution among the relay nodes are ensured.
Description
technical field [0001] The invention relates to a multi-relay selection method based on decoding and forwarding (DF) and other multi-factor cooperative capacity maximization, and belongs to the related field of LTE uplink cooperative communication relay selection research in wireless communication. Background technique [0002] Mobile communication has developed rapidly in recent decades, and user demands are constantly increasing, prompting the evolution of wireless communication systems from 2G and 3G to B3G and 4G. transformation. At the same time, mobile multimedia services have higher and higher requirements on bandwidth, and "broadband" has become the development trend of mobile communication technology. 3GPP Long Term Evolution (LTE), as a project related to the improvement of UTRAN (Universal Terrestrial Radio Access Network) and SAE (System Architecture Evolution) after the third generation mobile communication system, has become a challenge to broadband access tec...
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IPC IPC(8): H04W48/20H04W72/04
CPCY02D30/70
Inventor 孙恩昌李萌黄鑫张延华
Owner BEIJING UNIV OF TECH