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Resource allocation method in multi-user cooperative relay system on basis of power minimization

A technology of multi-user cooperation and relay system, which is applied in the field of resource allocation based on power minimization, and can solve problems such as too simple description

Inactive Publication Date: 2014-01-01
NINGBO UNIV
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Problems solved by technology

At present, most of the literature only studies the downlink resource allocation problem of OFDMA system, and there are few literatures that study the uplink resource allocation problem, and its description is too simple

Method used

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  • Resource allocation method in multi-user cooperative relay system on basis of power minimization
  • Resource allocation method in multi-user cooperative relay system on basis of power minimization
  • Resource allocation method in multi-user cooperative relay system on basis of power minimization

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] figure 1 The model system of the uplink in the multi-user cooperative relay system is given, and on this basis, the present invention proposes a resource allocation method based on power minimization in the multi-user cooperative relay system, which includes the following steps:

[0022] ①Assume that there are K users and M relays in the uplink of the multi-user cooperative relay system, and each user and each relay is equipped with only one antenna, and each user has several sub-carriers in N sub-carriers Data is transmitted to the base station through several relays on the carrier, where K≥1, M≥1, and N≥1. Here, there is no direct link between the user and the base station due to the long distance and significant fading.

[0023] Assume that the process of any user transmitting data to the base station is divided into two stages: th...

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Abstract

The invention discloses a resource allocation method in a multi-user cooperative relay system on the basis of power minimization. According to the method, by means of equivalent channel gain, a two-hop link in the system is converted into a virtual direct-transmission link, then the joint optimization problem related to subcarrier allocation, relay selection and power allocation is decomposed into the following three sub-problems that firstly, the number of subcarriers occupied by users is determined by means of a power minimization rule according to average channel gain and the target rate of the users; secondly, on the principle that the channel condition is optimal, the target rate of the users is taken into consideration at the same time, subcarrier allocation is carried out in the mode that the subcarriers are used for selecting the users and a relay, so that the situation that one subcarrier is allocated to multiple users is avoided, and computation complexity is reduced; thirdly, by means of combination of a water-filling algorithm and channel environment, power allocation is carried out, and the fact that the total power of the system is minimum is guaranteed. Besides, in the processes of subcarrier allocation and relay selection, energy loaded on the subcarriers is minimum, and therefore energy consumption of the system is reduced.

Description

technical field [0001] The present invention relates to a resource allocation technology in a multi-user cooperative relay system, in particular to a resource allocation method based on power minimization in a multi-user cooperative relay system. Background technique [0002] With the improvement of the quality of life, people have higher and higher requirements for wireless communication services, and the existing third-generation mobile communication system (3G) has been unable to meet people's requirements. Therefore, researchers are working on the fourth generation mobile communication system (4G) represented by LTE-A (LTE-Advanced). As one of the key technologies of the 4G system, OFDMA (Orthogonal Frequency Division Multiple Access) access technology is a typical representative of multi-carrier modulation technology applied to the wireless communication environment. OFDMA access technology can effectively reduce inter-symbol interference (Inter-symbol Interference, IS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04L5/00
CPCY02B60/50Y02D30/70
Inventor 李有明陈斌吴耀辉刘小青邹婷
Owner NINGBO UNIV
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