Joint resource optimization method based on underwater acoustic OFDM-NOMA (Orthogonal Frequency Division Multiplexing-Non-Orthogonal Multiple Access) system downlink

An OFDM-NOMA, downlink technology, applied in the field of downlink joint resource optimization algorithm based on underwater acoustic OFDM-NOMA system

Active Publication Date: 2019-04-12
ZHEJIANG UNIV
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Problems solved by technology

[0006] Aiming at the problem that there is currently no feasible non-orthogonal multiple access network resource allocation mechanism in harsh environments such as underwater, the present invention proposes a combination of subcarriers and power based on the d

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  • Joint resource optimization method based on underwater acoustic OFDM-NOMA (Orthogonal Frequency Division Multiplexing-Non-Orthogonal Multiple Access) system downlink
  • Joint resource optimization method based on underwater acoustic OFDM-NOMA (Orthogonal Frequency Division Multiplexing-Non-Orthogonal Multiple Access) system downlink
  • Joint resource optimization method based on underwater acoustic OFDM-NOMA (Orthogonal Frequency Division Multiplexing-Non-Orthogonal Multiple Access) system downlink

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[0019] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

[0020] Such as Figure 1-3 As shown, this embodiment provides a joint resource optimization method based on OFDM-NOMA downlink, including the following steps:

[0021] S1. Establish an underwater wireless communication system based on OFDM-NOMA downlink.

[0022] The system includes a BS and K anchor nodes. collection for anchor nodes express. Each OFDM symbol contains N effective data subcarriers, with the set express. h k,n and p k,n are the power gain and transmit power of anchor node k on subcarrier n, respectively, and the environmental noise is additive white Gaussian noise N(0,σ 2 ). The channel SNR of anchor node k on subcarrier n can be expressed as:

[0023]

[0024] Using the two-stage superposition coding technique as the NOMA method, ...

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Abstract

The invention provides a joint resource optimization method based on an underwater acoustic OFDM-NOMA (Orthogonal Frequency Division Multiplexing-Non-Orthogonal Multiple Access) system downlink and isused for solving a problem that in the prior art, no underwater non-orthogonal multiple access network resource allocation mechanism with high feasibility exists. An underwater acoustic wireless communication system based on OFDM-NOMA is established. A base station (BS) and K anchor nodes are deployed in the system. A channel information state of each anchor node is known. A constraint conditionis given. The constraint condition comprises a total transmitting power Pt of the base station and a constraint of subcarrier allocation number. A system rate sum is taken an objective function. In order to solve a joint resource optimization problem, the provided optimization problem is finished step by step. Subcarrier allocation is carried out through adoption of a greedy algorithm with relatively low algorithm complexity, so a system subcarrier allocation optimization objective is satisfied. For power allocation, an optimization objective is converted from a transmitting power to a communication rate, a power allocation model is converted into a strict convex optimization problem, and an optimum value is solved through adoption of a GP (Geometric Programming) algorithm. The method is scientific and reasonable, is low in algorithm complexity and is applicable to an underwater bad communication environment.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an underwater acoustic OFDM-NOMA system-based downlink joint resource optimization algorithm. Background technique [0002] Underwater acoustic channels are considered to be one of the most challenging communication channels. It has a series of characteristics such as fast time variation, large transmission attenuation, limited communication bandwidth, Doppler effect and serious multipath delay expansion, and large propagation delay. This brings great challenges to underwater wireless sensor networks, especially physical layer multi-user underwater acoustic communication. Multi-user underwater acoustic communication is divided into two modes: uplink communication and downlink communication. In the uplink, the base station receives multiple signals from different users at the same time; in the downlink, the base station sends signals to each user in th...

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Application Information

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IPC IPC(8): H04L5/00H04W72/04H04W72/08
CPCH04L5/0008H04L5/0057H04L5/006H04L5/0073H04W72/0453H04W72/0473H04W72/541
Inventor 刘妹琴陈肇邦樊臻张森林郑荣濠
Owner ZHEJIANG UNIV
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