Method for selecting transmitting antenna in amplification forwarding distribution type cooperative system
A technology of amplifying and forwarding and cooperative systems, applied in the field of communication, can solve the problems of high computational complexity, large amount of transmitted information, large feedback overhead, etc., and achieve the effects of high reliability of feedback information, high execution efficiency, and low noise superposition.
Inactive Publication Date: 2014-12-03
XIDIAN UNIV
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Problems solved by technology
The disadvantage of the patent applied by ZTE Corporation is that for the different selection methods in the source node antenna selection method, it is impossible to obtain a trade-off between the feedback overhead, computational complexity and performance of the system, not the system The overall feedback overhead is large and the computational complexity is high, which means that the performance obtained by the system is poor
The disadvantage of this method is that the amount of information transmitted from the relay node to the destination node is large, and the calculation complexity is high. The feedback information is fed back through the two links of the destination node-relay node and the relay node-source node, resulting in noise. The superposition of the transmitting node makes the wrong antenna selection, which makes the system performance degrade
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[0039] The present invention will be further described below with reference to the accompanying drawings.
[0040] refer to figure 2 , the network structure diagram of the present invention consists of a transmitting node S, N relay nodes R 1 to R N and a destination node D, and the transmitting node is equipped with N T The root transmitting antenna, the relay node and the destination node are equipped with only one antenna. Antenna selection is implemented from the transmitting node N T Only one root transmit antenna is selected as the transmit antenna to send information to all relay nodes. The solid line in the figure represents the channel through which the data to be sent passes, and the dotted line represents the channel between the transmitting antenna of the unselected transmitting node and the receiving antenna in the relay node. The working mode of the relay node is half-duplex mode, and the amplifying and forwarding cooperation protocol is adopted. The trans...
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The invention discloses a method for selecting a transmitting antenna in an amplification forwarding distribution type cooperative system, to solve the problems in the prior art that the feedback information is large in quantity and the antenna selection efficiency is low. The method comprises the specific steps that: (1) all transmitting antennas and relay nodes are numbered; (2) a channel vector matrix of a transmitting node to a relay node is estimated and fed back to each transmitting node by each relay node; (3) an antenna selection model value matrix is obtained according to the information fed back; (4) each row of elements in the antenna selection model value matrix are compared so as to obtain a minimum channel gain matrix; and a maximum element in the matrix is selected so as to obtain the antenna to be selected; (5) the information is broadcast to all relay nodes by the selected antenna, and the relay node carries out space-time coding on the received information and subsequently amplifies and forwards the information; and (6) whether the communication is accomplished is judged, if so, the communication is ended, otherwise, the method turns to the step (2). The method has the advantages that system feedback information is little and execution efficiency is high.
Description
technical field [0001] The invention belongs to the technical field of communication, and further relates to a transmitting antenna selection method in an amplifying and forwarding distributed space-time cooperative communication system in the field of multiple input and multiple output. The invention can be used to improve the transmission performance of the cooperative communication system. Background technique [0002] The antenna selection technology is to select the antenna or antenna group corresponding to the node with the best channel quality for signal transmission according to the channel state information between the nodes of the system, so as to improve the performance of wireless transmission. In order to realize antenna selection at the transmitting end of the amplifying and forwarding distributed cooperative system, feedback of channel state information is required separately or simultaneously between the receiving node and the transmitting node, between the r...
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IPC IPC(8): H04L1/06
Inventor 李勇朝尤爱华李丹萍张海林刘毅李蕾
Owner XIDIAN UNIV