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Broadband power line OFDM subcarrier bit loading method based on curve fitting

A technology of bit loading and curve fitting, applied in electrical components, digital transmission systems, transmission systems, etc., can solve the problems of high computational complexity, achieve good subcarrier power requirements, reduce the amount of calculation, and speed up the processing speed

Inactive Publication Date: 2016-08-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although the performance of this algorithm is excellent, it needs to look up the table every time a bit is loaded, and the computational complexity is high
[0004] Aiming at the high computational complexity of the traditional bit-loading method, this paper proposes a curve-fitting broadband power line OFDM subcarrier bit-loading method

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  • Broadband power line OFDM subcarrier bit loading method based on curve fitting
  • Broadband power line OFDM subcarrier bit loading method based on curve fitting
  • Broadband power line OFDM subcarrier bit loading method based on curve fitting

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Embodiment Construction

[0027] 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.

[0028] The examples are implemented in a typical power line channel environment. The parameter setting is: 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 maximum allocation on each subcarrier is set The number of bits is 8. It should be noted that the above parameters do not affect the generality of the present invention. figure 1 is the overall flowchart of the bit loading method based on curve fitting proposed by the present invention, figure 2 Schematic diagram of the proposed curve-fitting-based bitloading method for the present invention. by figure 2 As an example...

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Abstract

The invention discloses a broadband power line OFDM subcarrier bit loading method based on curve fitting, and belongs to the technical field of broadband power line communication. According to the method, first of all, on the basis that subcarrier channel quality of an OFDM system is calculated, a subcarrier set is determined according to a minimum power criterion so that subcarriers whose power consumption satisfies requirements are determined; then according to the subcarrier quality, a subcarrier partition number and a partition subcarrier set are determined, and each partition two-dimensional space of the subcarriers is established so that subsequent curve fitting operation can be carried out; secondly, a bit curve is loaded in a fitting mode and a subcarrier bit loading quantity of each partition is determined; and finally, according to the curve fitting subcarrier loading bit quantities, loading operation is performed on the subcarriers, and thus resource distribution is completed. By use of the method, under the conditions of certain power consumption and a system rate, it can be ensured that the calculation complexity of bit loading resource distribution is effectively reduced and a bit resource distribution result is quite excellent.

Description

technical field [0001] The invention relates to the technical field of broadband power line OFDM communication system transmission, and particularly focuses on the method of subcarrier power allocation and bit loading. Background technique [0002] Broadband power line communication has many problems when using power lines to realize information communication, and OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) technology has high data transmission rate, strong resistance to multipath interference and narrowband interference, and high spectrum utilization. Advantages, widely used in power line communication. The OFDM system can make use of multi-user diversity and channel fading characteristics, and adaptively allocate resources according to channel gain, which can obviously improve performance such as system throughput. Resource allocation in OFDM system involves the joint optimization of several resources such as subcarrier po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26
Inventor 陆俊刘振宇朱炎平彭文昊孙毅刘向军
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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