Power Allocation Algorithm for UAV Relay System Based on Energy Efficiency Optimal Criterion
A relay system and distribution algorithm technology, applied in radio transmission systems, power management, transmission systems, etc., can solve the problems of high computational complexity, difficult to obtain closed-form solutions, etc., achieve high energy efficiency, reduce algorithm complexity, The effect of improving performance
Active Publication Date: 2021-06-11
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
A multi-objective algorithm [7] is proposed to implement a user selection and power allocation scheme, so as to minimize the transmit power while ensuring the maximum throughput. The problem of maximizing the total energy efficiency of the weight is studied. By solving the system carrier and the Power allocation can maximize the energy efficiency of weights, and two algorithms of optimal and suboptimal are proposed [8], but this algorithm only obtains the lower boundary of maximizing the objective function through the greedy algorithm
Therefore, we see that the current power allocation algorithms [5]-[8] are mainly based on the optimal iterative algorithm, which has high computational complexity and is difficult to obtain closed-form solutions
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[0118] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0119] like figure 1 As shown, the present invention provides a power allocation algorithm based on the optimal criterion of energy efficiency for the unmanned aerial vehicle relay system, comprising the following steps:
[0120] Step 1: Establish a UAV-based relay transmission system model;
[0121] In the first time slot, the transmitting end S transmits the transmitted signal x(t) through beamforming, and the signal received at the relay end R can be expressed as
[0122]
[0123] P 1 is the signal transmission power of the transmitter S, formula h H The superscript H in is the conjugate transpose operator, w 1 =[w 1,1 w 1,2 …w 1,M ] T is the transmit beamforming weight vector of M×1, satisfying || || F Represents the Frobenius norm, x(t) is the transmitted signal and satisfies E(|x(t)| 2 )=1, n 1 with mean equal to 0 and variance equal to...
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The invention discloses a power distribution algorithm for a UAV relay system based on an optimal energy efficiency criterion. First, on the basis of a double-hop amplifying and forwarding relay transmission model, an optimal model for power distribution is established, and the power distribution problem is transformed into Solve an optimization problem for maximum system energy efficiency. In the process of solving the optimal power allocation, we first fix the transmitted signal power to obtain the beamforming optimization scheme; then, through the interval approximation of the large signal-to-noise ratio, the original non-convex optimization problem is transformed into a convex optimization problem; finally, using the KKT condition, The calculation yields the closed-form solution for the power distribution scheme. Simulation experiments show that the closed-form solution obtained by the algorithm disclosed in the present invention is close to the loop iteration method, thereby reducing the complexity of the algorithm.
Description
technical field [0001] The invention belongs to the field of unmanned aerial vehicle relay communication, relates to the energy efficiency of relay communication, power distribution, beam forming, convex optimization in the optimization method, and can be used in practical engineering fields such as unmanned aerial vehicle battlefield reconnaissance and environmental monitoring. Background technique [0002] In recent years, wireless relay technology has received sufficient attention and development. Compared with the traditional single-hop communication, the multi-hop communication technology of relay-assisted transmission can significantly expand the coverage of the communication network, improve the reliability of the communication system and increase the communication capacity of the system. Although communication satellites can realize relay communication functions, they are expensive, have large transmission delays, long construction periods, high maintenance costs, an...
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IPC IPC(8): H04W16/28H04W52/24H04W52/30H04W52/34H04W52/46H04B7/185
CPCH04B7/18504H04W16/28H04W52/241H04W52/30H04W52/34H04W52/46
Inventor 严晓琴颜俊朱卫平
Owner NANJING UNIV OF POSTS & TELECOMM
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