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Resource distribution method of multi-user OFDM (Orthogonal Frequency Division Multiplexing) system

A system resource and allocation method technology, applied in multi-frequency code system, wireless communication, electrical components, etc., can solve problems such as huge calculation amount, no consideration of user needs, and inapplicability, so as to reduce bit error rate and improve throughput Quantity and spectral efficiency, the effect of increasing the total rate

Inactive Publication Date: 2013-01-23
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, most of the previous studies did not consider the needs of different services among users.
The Hughes-Hartogs algorithm mentioned in some inventions is recognized as the optimal algorithm for bit loading, but its huge amount of calculation is not applicable in practice and can only be used as a theoretical basis; some inventions consider the differences between different users. The rate constraints of the business are different, but it uses an idealized linear water injection algorithm, which cannot adaptively modulate the bit allocation

Method used

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  • Resource distribution method of multi-user OFDM (Orthogonal Frequency Division Multiplexing) system
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  • Resource distribution method of multi-user OFDM (Orthogonal Frequency Division Multiplexing) system

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Embodiment Construction

[0045] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0046] figure 1 It is a flowchart of the present invention, and the present invention comprises the following steps:

[0047] S1: Obtain the user channel gain, and set the rate ratio constraint matrix between each user;

[0048] The rate ratio constraint matrix is ​​the ratio relationship matrix between user rates; in this paper, the first user is used as the default by default, and the rate of other users is how many times its rate. For example, assuming that the rates of four users are 50bps, 100bps, 150bps, and 200bps respectively, the rate constraint ratio constraint matrix should be [1,2,3,4].

[0049] S2: Allocate subcarriers to users according to the rate ratio c...

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Abstract

The invention discloses the technical field of communication, and in particular relates to a resource distribution method of a multi-user OFDM (Orthogonal Frequency Division Multiplexing) system. The resource distribution method comprises the steps of: firstly, obtaining user channel gain, setting a rate proportion constraint matrix among users; then distributing subcarriers to the users according to the rate proportion constraint matrix; and further distributing bits for the subcarriers. According to the invention, the rate proportion constraint is considered, after primary distribution is completed by adopting loop iteration of a genetic algorithm, secondary distribution is carried out by adopting a greedy algorithm, the constraint requirement is achieved, the total rate of the system is increased, the error rate is lowered, and the effects of improving throughput capacity of the system and increasing the frequency spectrum efficiency are achieved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a resource allocation method for a multi-user OFDM system. Background technique [0002] With the development of 3G services and the rise of the mobile Internet, users can perform services on mobile terminals that can only be performed on PCs, such as online video and online games. However, while enriching the user experience, it also brings data expansion, which makes the precious frequency resources more tense, and brings great challenges to traditional cells. How to increase the system throughput and spectrum utilization while ensuring the rate ratio constraints of different services for each user has become another hot issue. Because the OFDM system has the characteristics of high spectrum efficiency, adaptive modulation, good resistance to multipath fading, and strong frequency band expansion, it can effectively solve the problem of resource shortage and frequency in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04W72/04
Inventor 毛识博李巍海俎云霄侯宾刘刚陈自强李喆宋梅高婧钟昕城张健明蒋于岸
Owner BEIJING UNIV OF POSTS & TELECOMM
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