一种新型面向分组Turbo码的研究

Research on a new type of block-oriented Turbo code

传统Turbo码在接近山侬限仍具有优异的纠错性能,但其译码延迟较大,不能满足通信系统实时性的要求.为了降低延迟,适应通信系统的实时性要求,该文提出一种以分组码为子码,构造新型的Turbo码的编译码方法,并对这种新型Turbo码进行了大量的性能仿真.仿真结果表明,在交织长度较短的条件下,该新型Turbo码随迭代次数增加收敛较快,大大提高了Turbo码译码速度.这种新方法能够有效地降低Turbo码的译码延迟,它的出现能够进一步满足通信系统实时性的需要,从而扩展Turbo码的应用范围.

Traditional Turbo codes can achieve low bit error rates (BER) at signal to noise ratios (SNR) very close to the Shannon limit. But they can also produce a long decoding delay, limiting the use of Turbo codes in real-time communication systems. In order to decrease the decoding delay and meet the demand of real-time communication system, a method to construct a new type of block-oriented Turbo code is proposed, and shows simulations that under the condition of small interleaving size this Turbo code has much more quick convergence and better performance. This method can decrease the decoding delay of Turbo codes, so that Turbo codes can be used in real-time communication system. This method also extends the use of Turbo codes.