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Frequency hopping fountain code system and transmission method thereof

A fountain code and fountain coding technology, applied in the transmission field of the frequency hopping fountain code system, can solve the problems of increasing the complexity of system coding and decoding, reducing the information transmission rate, and the bit error rate cannot meet the actual needs, so as to achieve enhanced reliability. , the effect of improving the bit error rate performance and improving the security

Inactive Publication Date: 2014-01-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
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AI Technical Summary

Problems solved by technology

Although the Raptor fountain code using low bit rate LDPC code as precoding has a certain error correction capability, the bit error rate of the system transmission cannot meet the actual needs under certain circumstances
Using error-correcting codes such as convolutional codes can reduce the bit error rate of the system, but it will increase the complexity of system coding and decoding, and at the same time, because it will bring new redundancy, it will inevitably reduce the transmission rate of information

Method used

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  • Frequency hopping fountain code system and transmission method thereof
  • Frequency hopping fountain code system and transmission method thereof
  • Frequency hopping fountain code system and transmission method thereof

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Embodiment

[0035] figure 1 with figure 2 is a schematic diagram of the structure of a frequency-hopping fountain code system, composed of figure 1 with figure 2 It can be seen that the bit information sent from the source is first encoded with fountain codes. In this embodiment, the type of fountain code is Raptor code, and LDPC code is used for precoding. Subsequently, the encoded signal is interleaved through a bit interleaver, and the interleaved bit information is sent to a modulator to generate a transmission modulation symbol, and then radio frequency modulation is performed through a frequency hopping modulator and sent to a wireless channel. In the process of frequency hopping modulation, it is first necessary to synthesize the corresponding frequency carrier according to the predetermined frequency hopping frequency table, and then modulate the information on the carrier. At the receiving end, the receiver first needs to perform frequency hopping synchronization, then synt...

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Abstract

The invention relates to a frequency hopping fountain code system and a transmission method thereof, in particular to a transmission method of a frequency hopping fountain code system introduced by using a novel interweaving technology, and belongs to relevant technical fields of wireless communication systems, communication signal processing, channel coding and decoding and the like. The frequency hopping fountain code system can be used for transmitting data under the condition that a part of frequency points are blocked completely under the action of interference, so that the reliability of a communication system in a severe channel environment is enhanced. A bit-interleaved coded modulation technology is adopted, so that the bit error rate performance of the system is improved. Meanwhile, the redundancy is not increased, so that the rate of information transmission is not influenced. A bit-level interleaver is adopted, and can be used for encrypting under the condition that an interleaving rule cannot be obtained by an enemy, so that the safety of information transmission is enhanced.

Description

technical field [0001] The invention relates to a frequency-hopping fountain code system and a transmission method thereof, in particular to a transmission method of a frequency-hopping fountain code system introduced by a new interleaving technology, and belongs to the related technical fields of wireless communication systems, communication signal processing, and channel coding and decoding. Background technique [0002] In today's increasingly fierce electronic warfare environment, how to transmit data safely and effectively in a complex and harsh channel environment interfered by the enemy is one of the hot spots in military communication research. The frequency hopping communication technology enables the radio frequency to hop in random order and speed. When the enemy cannot grasp the hopping rules, the transmitted information can be effectively prevented from being intercepted. For blocking broadband interference, some frequency points are interfered and cannot transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B1/713
Inventor 卜祥元卢继华张序琦
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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