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OFDM cooperative diversity transmission method and device

A technology of cooperative diversity and transmission method, which is applied in the field of communication, can solve the problems of providing reliable communication quality, etc., and achieve the effect of enhancing the ability to resist time-varying interference and impulse noise, providing communication quality, and improving time diversity

Active Publication Date: 2013-10-30
杭州信熵科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the object of the present invention is to provide an OFDM cooperative diversity transmission method and device applied to narrow-band low-voltage power lines, to solve the problem that in the prior art, reliable communication quality cannot be provided on the basis of fully utilizing the communication frequency band and the number of nodes. The problem

Method used

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  • OFDM cooperative diversity transmission method and device
  • OFDM cooperative diversity transmission method and device
  • OFDM cooperative diversity transmission method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Such as figure 1 As shown, it is an implementation flow chart of a cooperative diversity transmission method of OFDM (Orthogonal Frequency Division Multiplexing) applied to a narrowband low-voltage power line communication network disclosed in Embodiment 1 of the present invention, and the specific process is :

[0076] Step S101: Divide the time required for data transmission into several time slots, and set the available frequency band in the power line communication network including source node, relay node and destination node as N channels, where N is a positive integer, where each Each channel has a fixed bandwidth and is identified by the working frequency point.

[0077] In the process of executing step S101, the available frequency band in the power line communication network is set as N channels. In the specific execution process, each channel is usually marked with a working frequency point, that is, when data selection is performed in a certain channel Dur...

Embodiment 2

[0096] On the basis of the OFDM cooperative diversity transmission method applied to the narrowband low-voltage power line communication network disclosed in the present invention, the specific execution method is basically the same as that in Embodiment 1, and steps S102 to S104 are specifically disclosed in this embodiment. in the specific execution process.

[0097] Execute step S102 in the first embodiment above, and refer to the attached figure 2 ,mainly includes:

[0098] Step S1021: The source node performs channel coding and interleaving processing on the acquired original data at n operating frequency points to obtain processed data.

[0099] The channel coding is mainly performed based on Reed-Solomon RS code, convolutional code, Turbo code or rate-compatible erasure convolutional code RCPC code.

[0100] Interleaving methods mainly include block interleaving, diagonal interleaving, spiral interleaving, odd-even or random interleaving.

[0101] Step S1022: Map th...

Embodiment 3

[0120] For the OFDM cooperative diversity transmission method based on the idea of ​​cooperative diversity disclosed in the present invention, the cooperative diversity utilizes an idle node in the network as a relay node, and uses different nodes (source node, relay node and destination node) at different frequency points Sending the same raw data improves diversity. A specific example is given in this embodiment for further description.

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Abstract

The invention discloses a cooperative diversity transmission method and device which is based on OFDM and applied to a narrow band low voltage power line communication network. The method comprises the steps that available subcarriers are divided into a plurality of channels based on an OFDM modulation system, idle nodes in a low voltage power line carrier communication network are used as relays, and all nodes in the network can be made to participate in work through the fact that different nodes send the same raw information on different channels. Further, due to the fact that working channels of different nodes can be selected freely, the effects that node sending power is fully used and frequency diversity is improved are achieved, and therefore the capability for confronting frequency selective fading and colored noise is improved. In addition, different interleaving codes or different channel codes are used by different channels, time diversity can be improved, and the capability for confronting time varying interference and pulse noise is enhanced. Through the OFDM cooperative diversity transmission method and device, the effect that reliable communication quality is supplied under the premise that communication frequency bands and the amount of nodes are used is achieved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a cooperative diversity transmission method and device of OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) applied to narrowband low-voltage power lines. Background technique [0002] PLC (Power Line Communication, power line communication technology) is a communication method that uses power lines to transmit data and signals. As the transmission medium of the power line network, it has the characteristics of low cost and low construction difficulty. Therefore, the power line carrier communication is widely used in the fields of automatic control and wide access. Low-voltage power line carrier communication is a kind of power line carrier communication. Compared with high-voltage and medium-voltage power line carrier communication, it has the widest coverage and the most abundant applications. Among them, there are bro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04B7/04H04B7/06
Inventor 刘义臣
Owner 杭州信熵科技有限公司
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