On a serial concatenated code using an LT code and its iterative decoding algorithm

LT码是一种码长和维数可以任意选择的无码率码。它已被证明，他们提供了相当好的性能，通过使用消息传递解码。然而，它们对于噪声信道不能实现良好的误差性能。然后提出了一种采用外LT码和内常规纠错码的级联码及其译码算法，该译码算法分别对内码和外码进行迭代有界距离译码和软判决LT译码。仿真结果表明，该方案比传统的级联编码方案更有效。

LT codes are rate less codes whose code length and dimension can be arbitrarily chosen. It has been shown that they provide considerably better performance by using a message-passing decoding. However, they are not able to achieve good error performance for a noisy channel. Then we propose a concatenated code using outer LT and inner conventional error correcting codes, and its decoding algorithm in which an iterative bounded-distance decoding and soft-decision LT decoding are performed to the inner and outer codes, respectively. The simulation results have shown that the proposed scheme is more effective than a conventional concatenated coding scheme.