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Fast bit loading method for single user in broadband power line ofdm system

A broadband power line, bit loading technology, applied in distribution line transmission systems, multi-frequency code systems, etc., can solve the problems of complex and complicated loading process, and achieve the effect of reducing transmission power, reducing computational complexity, and optimizing the distribution results.

Inactive Publication Date: 2016-12-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The performance of this algorithm is excellent, but iterative calculation is required to determine the available subcarriers of the system, which is more complicated
[0007] Considering that the existing bit loading method has a relatively complicated loading process, the present invention proposes a relatively simple fast bit loading method after improving the above method

Method used

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  • Fast bit loading method for single user in broadband power line ofdm system
  • Fast bit loading method for single user in broadband power line ofdm system
  • Fast bit loading method for single user in broadband power line ofdm system

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Embodiment Construction

[0028] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0029] Embodiments are implemented in a typical power line channel environment. The parameters are set as follows: set the number of subcarriers of one OFDM symbol in the power line OFDM system N=128, the bandwidth range is 0~20MHz, the upper limit of the system power spectrum is -50-0.8f (dBm / Hz), and the bit error rate is 10 -4 , assuming that the maximum number of allocated bits on each subcarrier is 6. It should be noted that the above parameters do not affect the generality of the present invention.

[0030] The flow of the resource allocation method of the present invention is as follows: figure 1 , the detailed flow chart is as figure 2 .

[0031] (1) Divide subcarrier channel quality levels

[0032] Sele...

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Abstract

The invention discloses a resource allocation method which is based on an OFDM system and belongs to the technical field of broadband power line communications. The technical scheme is to propose a single-user quick bit loading method for a broadband power line OFDM system. The method includes six steps of dividing subcarrier channel quality grades, selecting an available subcarrier set, calculating an initial load threshold, carrying out fast bit loading, determining whether the loading is over and updating a bit loading threshold. The single-user quick bit loading method for the broadband power line OFDM system can reduce the transmission power as much as possible with an optimal allocation result while guaranteeing a required rate by the system, and can also reduce the computational complexity of the system since the method is capable of batch loading of multiple bits.

Description

technical field [0001] The invention belongs to the technical field of broadband power line communication, and in particular relates to single-user bit loading of broadband power line communication based on OFDM system. Background technique [0002] Broadband Power Line Communication (B-PLC) is a communication method that uses power lines to transmit data and media signals. Because the power line has the advantages of wide coverage, no need to re-plan the wiring, and low construction costs, the power line communication has become one of the solutions to solve the "bottleneck" of the communication access network. However, power lines are not designed for communication. There are many problems in using power lines to realize information communication, such as strong noise interference, obvious multipath fading, frequency selectivity, and time variability. Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in power line communication due to its high da...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B3/54
Inventor 陆俊黄倩龚钢军钱明霞孙毅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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