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Random multiple access method based on fountain coding

A fountain coding and access method technology, which is applied in the field of random multiple access based on fountain coding, can solve the problems of error correction and detection, unfavorable bit error information, uncertainty of critical access probability, etc., and achieves simple implementation and good throughput. performance effect

Inactive Publication Date: 2018-11-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the original information is directly transmitted to the channel without any encoding, which is not conducive to error correction and error detection, which greatly reduces the throughput performance of the system.
In addition, the multi-user iterative detection decoding algorithm also has limitations, that is, the decoding performance will drop sharply under higher access probability
This leads to the need to find the critical access probability to optimize the system throughput performance, and the critical access probability is uncertain under different numbers of active users

Method used

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  • Random multiple access method based on fountain coding
  • Random multiple access method based on fountain coding
  • Random multiple access method based on fountain coding

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The random multiple access method based on fountain coding of the present invention comprises steps:

[0023] (1) Fountain encoding is performed on the original information of each user according to the degree distribution, and the encoded symbols are transmitted in blocks;

[0024] Such as figure 1 As shown, the random multiple access model based on fountain coding, assuming there are K potential active users, the original information frame x of each user k (k=1,2,...,K) k It consists of W bits, and after fountain coding in each time slot m (m=1, 2,..., M), the coded data frame c is obtained k,m =x k ·G k,m , and then modulated to obtain the modulated data frame tx k,m , where M is the total number of transmission slots, G k,m Generate a matrix for encoding of user k in the mth time slot. The block transmission ...

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Abstract

The invention discloses a random multiple access method based on fountain coding (FC), comprising the following steps: on the basis of an NC-RMA method, carrying out the fountain coding on raw information of users at a transmitting terminal, and carrying out block transmission on coded symbols; and based on the fountain coding, decoding all the users by adopting a simple random multiple access belief propagation decoding method at a receiving terminal. The FC-RMA method disclosed by the invention obviously realizes higher throughput performance and effectively solves the problem that throughput performance of the existing NC-RMA method is degraded sharply at high access probability.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a random multiple access method based on fountain coding. Background technique [0002] Multiple access allows multiple users to share common radio resources to meet their individual transmission needs. Due to the simplicity and distribution of its implementation, random multiple access has been used by almost all communication networks. The traditional ALOHA protocol is simple and flexible to implement. However, when multiple users transmit at the same time, the ALOHA protocol cannot make good use of the collision information between users, and encounters a great limitation in the system throughput performance. [0003] Different from traditional erasure codes, digital fountain codes can independently generate any number of codewords according to a certain probability distribution, and have the characteristics of unlimited code rate or no code rate (rateless). T...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W74/08H04B17/345H04B17/382H04B17/391H04L1/00
CPCH04L1/0006H04L1/0057H04W72/0446H04W74/0833H04B17/345H04B17/382H04B17/391
Inventor 邓昭徐大专
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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