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Digital communication method based on combination of DSSS dispreading operation and LDPC decoding

A combination of digital communication and technology, applied in the field of digital communication based on the combination of DSSS despreading operation and LDPC decoding, can solve the problems of losing prior information, affecting decoding results, unsuitable performance, etc.

Inactive Publication Date: 2016-03-23
DALIAN UNIV OF TECH
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Problems solved by technology

This method is simple to implement, but after the DSSS hard decision, some prior information required for error control decoding will be lost, thus affecting the decoding result, and it is not suitable for LDPC decoding with excellent performance.

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  • Digital communication method based on combination of DSSS dispreading operation and LDPC decoding
  • Digital communication method based on combination of DSSS dispreading operation and LDPC decoding
  • Digital communication method based on combination of DSSS dispreading operation and LDPC decoding

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Embodiment Construction

[0039] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0040] Such as figure 1 — Figure 4 Shown is a digital communication method based on the combination of DSSS despreading operation and LDPC decoding, specifically comprising the following steps:

[0041] S1: The sender extracts the data frame to be sent;

[0042] S2: The sending end encodes the above-mentioned extracted data information, and the method adopted is the LDPC encoding method;

[0043] S3: The sending end spreads the coded data, and the method adopted is the direct sequence spread spectrum method;

[0044] S4: The sending end sends the spread-spectrum data to the receiving end through the power line;

[0045] S5: The receiver processes the received data in the following way: ...

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Abstract

The invention discloses a digital communication method based on combination of DSSS spreading operation and LDPC decoding. The method comprises the following steps that S1) a sending end extracts a data frame that needs sending; S2) the sending end codes the extracted data information in an LDPC coding manner; S3) the sending end spreads the spectrum of the coded data in a DSSS manner; S4) the sending end sends data after spectrum spreading to a receiving end via a power line; and S5) the receiving end processes the received data. To enable LDPC decoding to obtain a more accurate initialization probability, reduce the cost, and prevent memory from processing floating points, related operation is carried out on the received DSSS signals via LDPC encoding and local PN codes after 1-bit A / D conversion, a result serves as input of an LDPC decoder without hard decision, and a final result is output via decoding and soft decision. The communication method has the advantages of high DSSS anti-interference feature, high LDPC error correction capability, simple circuits and low cost.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a digital communication method based on the combination of DSSS despreading operation and LDPC decoding. Background technique [0002] DSSS technology is widely used in digital communication systems. The transmitting circuit uses PN sequence to spread the baseband digital signal spectrum, and the receiving circuit uses the same PN sequence to despread and restore the baseband digital signal. It has the advantages of strong anti-narrowband interference ability, low spectral density, easy realization of multiple access communication, and simple circuit realization. In digital communication systems, error control technology is a commonly used method to improve communication reliability. LDPC code is a kind of error control code with good performance, which can approach the Shannon limit and has low decoding complexity, so it is widely used in many fields. [0003] In the transmit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L1/00
CPCH04B1/707H04B3/542H04L1/0057H04L1/0058
Inventor 魏东兴王国亚
Owner DALIAN UNIV OF TECH
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