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Fountain码的无速率特性使得它可以在信道删除率未知的删除信道下高效传输信息。但是由于传统的Fountain码(主要是LT码和Raptor码)在译码过程中未对差异信息进行处理,丢失了部分可以被译出的信息,从而增加了译码代价。针对传统Fountain码这方面的缺点,提出一种利用消除度数为2的校验单元来处理差异信息的Fountain码译码的改进方法。仿真结果验证,采用该方法不但保证了Fountain码的无速率特性,而且提高了信息利用率和译码效率。
The speed-free nature of the Fountain Code allows it to efficiently transfer information on deleted channels with unknown channel deletion rates. However, since the traditional Fountain Code (mainly LT codes and Raptor codes) does not process the difference information in the decoding process, some of the information that can be decoded is lost, thereby increasing the decoding cost. Aiming at the shortcomings of traditional Fountain Code, this paper proposes an improved method of decoding Fountain code by using checkout unit with degree of 2 elimination to process difference information. Simulation results verify that this method not only guarantees the ratelessness of the Fountain code, but also improves the information utilization and decoding efficiency.