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Multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment

A cognitive radio and resource allocation technology, applied in wireless communication, electrical components, advanced technologies, etc., can solve problems such as low reachable rate for weak users, decoding failures, neglect of user fairness, etc. Fairness, the effect of improving spectral efficiency

Active Publication Date: 2019-07-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method ignores the fairness among users, which may lead to the low reachable rate of the weak user (WU), and then the decoding fails

Method used

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  • Multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment
  • Multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment
  • Multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment

Examples

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Embodiment 1

[0079] A multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment, operating in a multi-user relay communication system based on NOMA and SWIPT cognitive radio environment, such as figure 1 As shown, including a primary user PU, m relays R 1 ~R m , two secondary user senders ST 1 and ST 2 , and a secondary user receiving end SR, the primary user PU is always in the communication state;

[0080] Since there is no direct connection path from the secondary user’s sending end to the secondary user’s receiving end, the signal of the secondary user needs to be amplified and forwarded (AF) through the relay. During this process, the relay will perform dynamic power down the forwarding signal service. In actual scenarios, the sending end and the receiving end often have a fixed energy source. However, due to the characteristics of large number, wide distribution, complex working environment, and difficulty in charging in time, it is assumed that th...

Embodiment 2

[0121] According to the multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment described in Embodiment 1, the difference is that: within the first stage, two secondary user transmitting ends transmit radio frequency signals at the same time, and the relay receives radio frequency signals signal and perform energy harvesting; in the second stage, the relay forwards the remaining signal after energy harvesting in the first stage, and the energy used for forwarding is provided by the energy collected in the first stage; including Proceed as follows:

[0122] A. Transmission process: the first time period: in the first time period, the two secondary user senders ST 1 and ST 2 Simultaneously send signal, relay R i is activated and receives a signal, 1≤i≤m, which will cause interference to the PU during signal transmission. In order to highlight the main contradiction of the problem, we will simplify the problem appropriately. Ignore relay R us...

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Abstract

The invention relates to a multi-user resource allocation method based on NOMA and SWIPT cognitive radio environment. The method is operated in a multi-user relay communication system based on NOMA and SWIPT cognitive radio environment and comprises a main user PU, m relays R1 to Rm, two secondary user sending ends ST1 and ST2 and a secondary user receiving end SR, and the main user PU is in a communication state all the time; and the number of accessible system users is increased, and the frequency effect and the energy efficiency of the system are improved. A traversal optimal solution solving method is adopted, a complex non-convex problem is converted into a linear programming problem easy to solve, and finally the reachable rate of weak users in the secondary network is maximized.

Description

technical field [0001] The invention relates to a multi-user resource allocation method based on NOMA (simultaneous transmission of wireless information energy) and SWIPT (non-orthogonal multiple access) cognitive radio environment, and belongs to the technical field of communication systems. Background technique [0002] With the emergence of 5G, the demand for mobile device access is increasing geometrically, and the scarcity of spectrum resources is in conflict with users' greater demand for speed. NOMA can greatly improve spectrum efficiency, realize multiplexing in the power domain, increase the number of user access and reduce transmission delay, so it has received more and more attention. The basic idea of ​​NOMA is to use non-orthogonal transmission at the transmitting end, different users present different power differences at the receiving end, actively introduce interference information, and then use serial interference cancellation (SIC) to achieve correct demodu...

Claims

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Application Information

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IPC IPC(8): H04W72/08
CPCH04W72/541H04W72/542Y02D30/70
Inventor 周晓天程睿张海霞袁东风
Owner SHANDONG UNIV
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