Quadrature encoding method for multi-channel transmission for power frequency communication
A power frequency communication and orthogonal coding technology, which is applied in the field of communication, can solve the problems of low power frequency communication rate, no reduction in signal-to-noise ratio, and reduction of signal transmission power.
Active Publication Date: 2015-05-27
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
[0006] In view of the above problems, the object of the present invention is to provide a method for constructing an orthogonal code for multi-channel transmission in power frequency communication. Through multiple transmission technology, the problem of low power frequency communication rate can be well solved without reducing the signal. Reduce signal transmission power under noise ratio
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[0026] The embodiment of the present invention provides a method for modulation and encoding of power frequency communication multiplex transmission. In order to make the technical solutions of the embodiments of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] Please refer to figure 1 It is a flowchart of an embodiment of an orthogonal coding method for power frequency communication multiplex transmission according to the present invention. Described method specifically comprises:
[0028] Step 101: Obtain the relationship between the encoding method of the industrial frequency communication uplink signal and the detection vector of the industrial frequency communication uplink signal;
[0029] It is assumed that one-bit digital information of the uplink signal is represented by N (an integer of N>4) adjacent current cycles, and there are 2N zero-crossing mo...
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The invention provides a quadrature modulation and encoding method for multi-channel transmission for power frequency communication, which is used for increasing the transmission rate of power frequency communication uplink signals and reducing sending power of a power frequency communication sending device. The quadrature modulation and encoding method comprises the following steps: representing single-bit information by N (N is more than 4) neighboring current cycles; according to the modulation mode of the power frequency communication uplink signals and property of the detection vectors, deducing the relation between an encoding and modulation mode of the power frequency communication uplink signals and detection vectors of the uplink signals, and obtaining satisfaction conditions of the detection vectors of the uplink signals; constructing a 2N-order Hadamard matrix so as to obtain quadrature code blocks; selecting a code block meeting the condition of the detection vectors from the Hadamard matrix to be taken as the detection vectors of the power frequency communication uplink signals; obtaining the quadrature encoding and modulation mode of the uplink signals based on the detection vector; and finally realizing multi-channel transmission by the quadrature encoding mode.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to an orthogonal coding method for multiplex transmission in industrial frequency communication. Background technique [0002] The power frequency communication technology in the prior art uses the medium and low voltage distribution network as the channel, modulates the downstream voltage signal and the upstream current signal near the zero crossing point of the power frequency voltage, and uses the slight distortion of the power frequency voltage and current waveform of the power grid to carry information A special power line communication technology. Compared with the power line carrier communication technology, this technology has the characteristics of penetrating transformer transmission, long transmission distance, high reliability and low cost. It modulates the signal through different positions relative to the reference point (zero crossing point), expresses the digi...
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IPC IPC(8): H04J13/12H04J11/00H04L1/06
Inventor 刘国军李建岐钟丽梅王凯睿黄毕尧王智慧渠晓峰王立诚权楠
Owner CHINA ELECTRIC POWER RES INST