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信道编码技术是保证移动通信传输质量的关键技术。卷积Turbo码(简称CTC)是很灵活的码字,帧长和码率的变化范围很大,这也是选它做为WiMAX(World Interoperability for Microwave Access)标准中的信道编码方案之一的主要原因。它采用递归系统卷积码作为子码,相对于经典Turbo码,它具有编码效率高,相同复杂度译码器下纠错性能好以及译码时延小等优点。本文将首先介绍卷积Trurbo码的基本编译码原理,并在多径衰落环境下,对WiMAX系统中的卷积Trurbo码性能进行了仿真验证。
Channel coding technology is to ensure the quality of mobile communication transmission of key technologies. The Convolutional Turbo Code (CTC) is a very flexible codeword with a wide range of frame lengths and bit rates, which is why it is chosen as one of the channel coding schemes in the World Interoperability for Microwave Access (WiMAX) standard the reason. It uses the recursive system convolutional code as the sub-code, compared with the classical Turbo code, it has the advantages of high coding efficiency, good error correction performance under the same complexity decoder and decoding delay. This paper will first introduce the basic coding and decoding principle of convolutional Trurbo codes and verify the performance of convolutional Trurbo codes in WiMAX systems under the conditions of multipath fading.