Spectrum spread communication system

Abstract

Disclosed is a spectrum spread communication system which is hardly influenced by a noise, and can identify a frame structure at the reception side if a frame synchronization signal is not transmitted. A spread code generator (42) switches spread codes (Scai, Scbi) for each frame, and outputs to a spread / modulation unit (41). The spread / modulation unit (41) spreads and modulates transmission data and transmits to a direct current power line (2). A reference code generator (44) generates reference codes (Scai, Scbi) at the same code phase. Spread / demodulation units (43a, 43b) spread and demodulate the received signal using the reference codes (Scai, Scbi), and output to a selection unit (47). A frame synchronization detection unit (46) identifies a frame structure on the basis of the switching of synchronization states of the code phase in a code phase synchronization detection unit (45). The selection unit (47) outputs reception data by selecting the spread / demodulated data output from the phase-synchronized spread / demodulation unit among the spread / demodulation units (43a, 43b).

Description

technical field [0001] The present invention relates to a communication system for spreading and modulating transmission data in a frame structure. Background technique [0002] Figure 7 It is a block configuration diagram showing a conventional solar power generation system. [0003] In the figure, 1a to 1f are solar panels, 2a to 2f are DC power lines, and 3 is a power conditioner. The solar cell panels 1a to 1f are plate-shaped products that obtain required voltage and current by connecting a plurality of solar cells in series and parallel, and are also called solar cell modules. [0004] A plurality of solar cell panels 1 a to 1 f are connected in series or in parallel via DC power lines 2 a to 2 f , and DC power generated by solar power in the solar cell panels 1 a to 1 f is supplied to loads via a power conditioner 3 . The DC power is converted into AC power by the power conditioner 3 . [0005] Among the renewable energies introduced to realize a low-carbon societ...

AI Technical Summary

Problems solved by technology

[0011] Therefore, frame synchronization is performed by inserting a frame synchronization signal at the beginning of a frame, or distributing and distributing frame synchronization signals into transmission data within a frame for transmission (refer to Patent Document 1, but this technology does not use a spread spectrum communication method)

[0012] However, when the frame length is short, when the frame synchronization signal is inserted into the transmission data, the transmission efficiency decreases

For example, when a 16-32-bit frame synchronization signal is inserted into a 64-bit frame, there is a problem that the transmission efficiency is greatly reduced

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