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Decode-and-forward relaying resource allocation method for orthogonal frequency division multiplexing (OFDM) system

A technology of resource allocation, decoding and forwarding, which is applied in the field of resource allocation and can solve the problem that the cooperative OFDM system cannot be directly applied.

Active Publication Date: 2011-11-09
NAT UNIV OF DEFENSE TECH
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  • Description
  • Claims
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Problems solved by technology

As a classic subcarrier power allocation algorithm, the traditional Lagrangian water filling algorithm cannot be directly applied to a cooperative OFDM system, and is only suitable for a single-hop OFDM system (that is, an OFDM system in which the source node and the destination node communicate directly)

Method used

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  • Decode-and-forward relaying resource allocation method for orthogonal frequency division multiplexing (OFDM) system
  • Decode-and-forward relaying resource allocation method for orthogonal frequency division multiplexing (OFDM) system
  • Decode-and-forward relaying resource allocation method for orthogonal frequency division multiplexing (OFDM) system

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Embodiment Construction

[0088] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0089] figure 1It is a schematic flowchart of a resource allocation method applicable to multiple relay node DFs in a coordinated OFDM system under the condition that the total system power is limited. As shown in the figure, the whole process of resource allocation is completed by sequentially performing subcarrier matching and relay node selection, power allocation of subcarrier pairs, and power allocation between subcarriers within a subcarrier pair.

[0090] figure 2 It is a schematic flowchart of a resource allocation method applicable to a single relay node DF in a cooperative OFDM system under the condition that node power is independently limited. As shown in the figure, the whole process of resource allocation is completed by sequentially performing subcarrier matching, initial power allocation, adjusting the power on each subcarrier of the relay node, an...

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Abstract

The invention provides a resource allocation method for a relay node adopting decode-and-forward transmission mode in a collaborative orthogonal frequency division multiplexing system. A first technical scheme is applied to total system power restraint conditions, and specifically comprises the following steps of: 1, sub-carrier matching and relay node selection; 2, the power allocation of sub-carrier pairs; and 3, the power allocation between the sub-carriers in each sub-carrier pair. By the first technical scheme, the execution of the power allocation is simplified. A second technical scheme is applied to node power independently-restrained conditions, and specifically comprises the following steps of: 1, the sub-carrier matching; 2, initial power allocation; 3, the power regulation of each sub-carrier of the relay node; and 4, the recovery of surplus power of a source node. By the second technical scheme, the total power consumption of a system is minimized on the basis of ensuring the maximum of system capacity so as to fulfill the aim of prolonging the time to live of the node.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a resource allocation method when a relay node in a cooperative OFDM (Orthogonal Frequency Division Multiplexing) system adopts a DF (Decode-and-Forward, decoding and forwarding) transmission mode . Background technique [0002] The main idea of ​​OFDM technology is to divide the channel into several orthogonal sub-carriers, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-carrier for transmission. The system using OFDM technology is called OFDM system. Cooperative relay technology is to use the broadcast characteristics of wireless communication to obtain space diversity gain through the cooperation of multiple spatially separated relay nodes. AF (Amplify-and-Forward, amplification and forwarding) and DF are two main transmission modes for implementing cooperative relay technology. In the AF mode, the relay no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04L27/26
CPCY02B60/50Y02D30/70
Inventor 魏急波王丽洁马东堂王欣唐艺赵海涛习勇黄勤飞
Owner NAT UNIV OF DEFENSE TECH
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