Parameter adjusting method in MIMO intelligent reflecting surface transmission system
A parameter adjustment and transmission system technology, applied in the transmission system, radio transmission system, electrical components, etc., can solve the problems of not considering the influence of flow number performance and less research in multi-cell scenarios, and achieve the effect of high attainable rate
Active Publication Date: 2021-10-01
SOUTHEAST UNIV
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[0003] The purpose of the present invention is to provide a parameter adjustment method in a MIMO intelligent reflective surface transmission system to solve the problem of joint optimization of precoding and phase shift angle in the prior art, and to model and solve the problem under a fixed number of streams Yes, the performance impact brought by the number of flows is not considered, and there are few technical issues in the multi-cell scenario.
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[0085] In order to better understand the purpose, structure and function of the present invention, a parameter adjustment method in a MIMO intelligent reflective surface transmission system of the present invention will be described in further detail below with reference to the accompanying drawings.
[0086] like figure 1 As shown, BS i represents the base station of the ith cell, User K represents the Kth user in the cell, and the specific parameters given in the present invention are as follows: the number of cells M=2, the number of users in each cell K=5, the number of users in each cell The number of receiving antennas N for each user r = 4, the number of smart reflector reflection units M = 20, the base station transmit power P l,max =1W, the channel noise variance σ 2 =-174dBm, training interval J=5, parameter assignment interval T=10.
[0087] In the base station measurement, the base station of the lth cell pairs the signal s sent to the kth user of the lth cell ...
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The invention provides a parameter adjusting method in an MIMO intelligent reflecting surface transmission system. The method comprises the following steps: firstly, establishing a total reachable rate maximization model, then converting the model into an equivalent optimization model, and splitting the equivalent optimization model into two sub-models, namely a precoding and phase shift angle model and a fluxion optimization model; for the fluxion optimization model, using a multi-agent DQN learning method to obtain fluxion; in combination with the fluxion, using an iteration method for solving the precoding and phase shift angle model, and in the iteration process, updating a precoding matrix by using a KKT condition and updating a phase shift angle by using an MM algorithm. By using the method provided by the invention, a larger total reachable rate can be obtained under the same transmitting power and the same number of reflecting units of the intelligent reflecting surface (RIS).
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a parameter adjustment method in a MIMO intelligent reflective surface transmission system. Background technique [0002] At present, most of the existing research on the parameter adjustment method in the MIMO intelligent reflector transmission system is aimed at the joint optimization of precoding and phase shift angle, and the problem is modeled and solved under a fixed number of streams, without considering the stream. The performance impact brought by the number of data, and the research on the multi-cell scenario is also less. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a parameter adjustment method in a MIMO intelligent reflective surface transmission system, so as to solve the problem that the prior art is the joint optimization of precoding and phase shift angle, and the modeling and solution of the pr...
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IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456
Inventor 陈明范鸣
Owner SOUTHEAST UNIV