A joint resource allocation method in a two-way multi-relay ofdm system

A technology of joint allocation and resource, applied in wireless communication, electrical components and other directions, can solve the problems of high computational complexity and insufficient resource utilization, and achieve the effect of improving system performance, simplifying computational complexity, and improving capacity

Active Publication Date: 2019-03-12
CERTUS NETWORK TECHNANJING
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Problems solved by technology

[0005] Technical problem: The present invention aims at the disadvantages of the traditional two-way OFDM multi-relay system resource allocation method, such as high computational complexity and insufficient resource utilization, and provides a resource allocation method in a two-way OFDM multi-relay system with superior performance and low complexity. joint allocation method

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  • A joint resource allocation method in a two-way multi-relay ofdm system
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  • A joint resource allocation method in a two-way multi-relay ofdm system

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with embodiment and accompanying drawing:

[0023] 1. Two-hop bidirectional multi-relay OFDM system model

[0024] The two-hop bidirectional multi-relay OFDM system model to be studied in this chapter is as follows: figure 1 As shown, two user nodes S 1 with S 2 Communication is carried out through K bidirectional relay nodes, and the transmission bandwidth is divided into N subcarriers, and each subcarrier shares the system bandwidth equally and experiences independent Rayleigh fading. All relay nodes adopt half-duplex AF relay mode, and can obtain instantaneous channel information of all subcarriers. The communication process of the system is divided into two time slots. In the first time slot, all relay nodes receive 1 with S 2 The transmitted signal is broadcasted and the received signal is combined; in the second time slot, all relay nodes amplify the received signal, and then forward it to t...

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Abstract

The invention discloses a resource joint allocation method in a two-way multi-relay OFDM system. In the two-way relay OFDM system, all relays are allowed to forward the same subcarrier pair to improve the diversity gain of the system. Based on this, A joint method of power allocation and subcarrier pairing with the goal of maximizing system capacity is proposed. In order to simplify the computational complexity of the optimization problem, a new power allocation method based on Cauchy's inequality and dichotomy is proposed, which prioritizes the internal power allocation of fixed subcarrier pairs, and transforms the optimization model into a typical two-dimensional optimization problem. Then solve it by Hungarian algorithm and subgradient algorithm. The combined resource allocation algorithm proposed by the invention is superior to the traditional optimal relay selection algorithm and the algorithm without space diversity gain in terms of system capacity performance.

Description

technical field [0001] The invention discloses a resource joint allocation method in a two-way multi-relay OFDM system, belonging to the technical field of wireless communication. Background technique [0002] There are many new problems in the wireless network that are not found in the wired network, such as the problem of fast and slow fading of the signal, the problem of multi-path propagation of the signal, and the problem of mobile communication. Transmission rate. However, the wireless communication network has a large number of users, and different users have different and rich service requirements, all of which require better communication quality and higher information transmission rate. Therefore, the current wireless communication technology needs to seek continuous innovation and change to meet the increasing service requirements of users. The traditional wireless communication technology adopts end-to-end signal direct transmission, which has reached the Shann...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04
CPCH04W72/0453H04W72/53
Inventor 朱琦梁轩伟
Owner CERTUS NETWORK TECHNANJING
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