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Dynamic resource allocation method for orthogonal frequency division multiple access (OFDMA) system

A dynamic resource allocation and allocated technology, applied in multi-frequency code systems, advanced technologies, electrical components, etc., can solve problems such as high method complexity, high algorithm complexity, and high complexity

Inactive Publication Date: 2014-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The existing resource allocation methods basically only focus on the improvement of spectral efficiency, while ignoring energy efficiency, and the existing method of OFDM energy efficiency and spectral efficiency compromise is too complex, and it is necessary to continuously iteratively approximate the search to obtain the optimal power allocation.
The Greedy algorithm is the earliest proposed algorithm for maximizing spectral efficiency under power constraints. The algorithm has a simple idea, and the performance of the algorithm reaches Optimal, but the algorithm is too complex and does not consider the energy efficiency; X.Cong et al. proposed a JIDO algorithm using interval search, although the algorithm can handle spectrum efficiency and energy efficiency well Effective compromise, but due to the need to find the optimal power allocation in a large range, the complexity is still too high in actual channel conditions

Method used

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  • Dynamic resource allocation method for orthogonal frequency division multiple access (OFDMA) system
  • Dynamic resource allocation method for orthogonal frequency division multiple access (OFDMA) system
  • Dynamic resource allocation method for orthogonal frequency division multiple access (OFDMA) system

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Embodiment Construction

[0033] Specific embodiments of the present invention will be given below in conjunction with the accompanying drawings.

[0034] Before elaborating the specific implementation, first introduce the mathematical model used therein:

[0035] The mathematical model used in the method of the present invention is: take maximizing each user's energy efficiency (EE) and the problem as an example, assuming that the base station can accurately obtain the channel state information (CSI) of each user in each sub-channel, and the channel is a frequency selective fading channel , the mathematical model of the optimization problem can be described as:

[0036] max N k ∈ N , P k U = Σ k = 1 K ...

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Abstract

The invention discloses a dynamic resource allocation method used in an OFDMA system, comprising: (1) a parameter initialization step; (2) a subcarrier scheduling step; (3) a power allocation step. The method of the invention can solve the optimal power without a large number of stepwise approximation searches, effectively reducing the computational complexity. When the spectral efficiency meets the system requirements, the energy efficiency is taken as the main consideration at this time, and the method of the present invention can be used to obtain the minimum energy consumption of the transmission unit bit, and can obtain a good balance between the spectral efficiency and the energy efficiency, further improving Energy efficiency makes communications more energy-efficient and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of wireless and mobile communication, and in particular relates to a dynamic resource allocation method in an OFDMA system. Background technique [0002] With the widespread rise of data services and the rapid development of the mobile Internet, future wireless communication technologies will have higher data transmission rates to meet the needs of more users. Among the current wireless solutions, Orthogonal Frequency Division Multiplexing (OFDM) has been widely valued for its advantages of high spectrum utilization and strong anti-interference ability. However, in traditional OFDMA systems, the performance of the system is limited by the worst sub-channel. In order to reduce this limitation and make full use of system resources (bandwidth and power), dynamic self-adaptation technology can be used. The existing resource allocation methods basically only focus on the improvement of spectral efficiency, whil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04L27/26
CPCY02B60/50Y02D30/70
Inventor 郑正广冀秋月但黎琳武刚李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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