Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system

A resource allocation, multi-user technology, applied in multi-frequency code systems, wireless communications, electrical components, etc., can solve the problems of limiting system performance, not making full use of idle sub-carrier spectrum resources, and reducing computational complexity.

Inactive Publication Date: 2012-10-10
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In addition, all these joint resource allocation schemes are based on the assumption of traditional relay cooperation, that is, the second time slot only allows relay nodes to forward transmissions, but since in DF relay cooperative netwo...

Method used

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  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system
  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system
  • Union resource distributing method of improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding-forwarding) system

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[0149] figure 1 In the improved OFDM DF relay channel with multiple users, the relay R assists the source S to send the signal to the user D by first decoding and then forwarding the received signal. k (k=1,...,K) transmission signal. The system completes a complete signal transmission in two time slots. The specific steps are as follows:

[0150] (1) Based on the instantaneous state information, the central unit of the system obtains the optimal resource allocation strategy that can be obtained by the current channel state by solving the optimization problem of the end-to-end throughput of the system And use this to judge and switch the relay mode of the system;

[0151] (2) In the first time slot, S broadcasts information to all other nodes according to the current optimal resource allocation strategy, and R and K users receive it at the same time;

[0152] (3) In the second time slot, the system switches the relay mode according to the current optimal resource allocatio...

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Abstract

The invention discloses a union resource distributing method of an improved-type multi-user OFDM (orthogonal frequency division multiplexing) DF (decoding forwarding) system, wherein a relay station assist information source with a DF (decoding-forwarding) mechanism communicates with a plurality of users; the union resource distribution of the system is realized through a dual-time-clearance transmission mode, comprising system subcarrier matching, subcarrier pair-user distribution as well as subcarrier power distribution; based on the analysis of channel state information by a pivot control unit, the system working mode switching is realized; and when a certain subcarrier of the system is in the idle mode, an idle subcarrier of an information source second time clearance is allowed to be transmitted additionally. Compared with the traditional OFDM based multi-user relay cooperative system, the method provided by the invention effectively overcomes the defect that a relay subcarrier of the traditional OFDM system can not be fully utilized at the second time clearance and obviously improves the frequency spectrum frequency.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to an improved multi-user OFDM DF system joint resource allocation method, that is, a multi-user downlink joint resource allocation technology based on OFDM modulation and improved DF relay cooperation. Background technique [0002] With the rapid development of wireless technology and the continuous popularization of wireless applications, people's demands and expectations for diversified communication services are also increasing day by day. In order to make wireless communication systems have higher reliability and higher spectrum Non-ideal characteristics such as fading and intersymbol interference caused by communication range and more complex and diverse communication environments are particularly important. The direct solution is to use wireless transmission technology with higher spectrum efficiency and stronger anti-multipath interference ability in the wireles...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04W72/04
Inventor 刘永陈文
Owner SHANGHAI JIAO TONG UNIV
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