Self-adapting fountain code multicast transmission system based on modulation

A technology of multicast transmission and fountain codes, which is applied in transmission systems, digital transmission systems, broadcast service distribution, etc., can solve problems such as feedback storms that are difficult to solve, cannot be ignored, and the complexity of forward error correction technology coding and decoding is large. The effect of reducing feedback, improving overall performance, and increasing throughput

Inactive Publication Date: 2009-10-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the feedback brought by ARQ technology cannot be ignored as the number of users increases. In severe cases, feedback storm proble...

Method used

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  • Self-adapting fountain code multicast transmission system based on modulation
  • Self-adapting fountain code multicast transmission system based on modulation
  • Self-adapting fountain code multicast transmission system based on modulation

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Embodiment Construction

[0033] Such as figure 1 As shown, the system of the present invention includes a base station 1 and user terminals 2.1, ..., 2.M, for the convenience of expression, the user terminals 2.1, ..., user terminals 2.M are collectively referred to as user terminals 2, and M is the number of user terminals , 2≤M≤500.

[0034] Such as figure 1 As shown, the base station 1 includes a base station data storage 11 , a fountain coder 12 , a user classification processor 13 , a superposition coder 14 , a modulator 15 , a base station duplex transceiver 16 and a feedback information processing module 17 .

[0035] The main function of the base station data memory 11 is to receive and store the original data packet to be sent from the upper layer, and to receive and store the ACK (acknowledgment character) from the feedback information processing module 17 . When the number of ACKs is greater than or equal to M and the number of original data packets is greater than or equal to K, the firs...

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Abstract

The invention discloses a self-adapting fountain code multicast transmission system based on modulation, which comprises a base station and a plurality of user sides. The base station comprises a base station data memory, a fountain coder, a user classification processor, a superposition coder, a modulator, a base station duplex transceiver and a feedback information processing module; and each user side comprises a terminal duplex transceiver, a serial interference cancellation decoder, a terminal data memory, a fountain decoder and a feedback generator. In a correcting and deleting channel, a mode of digital fountain codes is adopted for transmission so as to reduce the feedback in a multicast environment and improve the throughput rate of the system. According to a multi-user channel state, modulation modes are self-adaptively switched and selected. When the performance difference among the users is small, a common modulation mode is adopted; and when the performance difference among the users is large, superposition coding for different user information is carried out through power distribution so that the system still can keep good transmission performance. The combination of the digital fountain code and the superposition coding exerts the advantages of the digital fountain code and improves the performances.

Description

technical field [0001] The invention relates to wireless multicast transmission technology, in particular to a modulation-based adaptive digital fountain code transmission system in a multicast system. Background technique [0002] In multicast communication, in order to ensure the reliability of transmission and obtain the highest possible transmission rate, many schemes have been proposed, the most typical of which are forward error correction technology and ARQ (Automatic Repeat Request) technology. However, the feedback brought by ARQ technology cannot be ignored as the number of users increases. In severe cases, feedback storm problems that are not easy to solve will occur, and forward error correction technology also faces the problem of high coding and decoding complexity. [0003] Digital fountain codes are rateless codes suitable for erasure-correcting channels. Due to their very pronounced low-feedback properties, digital fountain codes have received increasing at...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04W28/04H04W88/08H04L1/00H04L1/16H04L1/18
Inventor 刘应状李姗孙俊王德胜林宏志葛晓虎朱光喜
Owner HUAZHONG UNIV OF SCI & TECH
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