Turbo码性能分析与仿真

纠错编码技术可有效地提高或改善移动通信的可靠性,在通信系统中得到了广泛地应用.在详细分析Turbo码编译码结构、译码算法的基础上,对Turbo码的性能进行了仿真.结果表明:Log-MAP算法比SOVA算法运算量大、费时更多;相同迭代次数下,Log-MAP算法比SOVA算法误码率性能好;同一算法下,迭代次数越大,误码率性能越好;帧长越大,误码率性能越好.因此,为了保证通信的可靠性和实用性,应对算法、迭代次数、帧长进行权衡.

Performance Analysis and Simulation of Turbo Code

The technique for error-correcting encoding can be used to promote and im-prove the stability of mobile communication, which is widely used in communication system. On the basis of analyzing the decoding structures and its algorithm of Turbo code, the Turbo performance is simulated. The result shows that the Log- MAP algorithm is more operational and time consumptive than that of SOVA algorithm. Under the same iterative numbers, the error rate of Log-MAP is better than SOVA. Under the same al-gorithm, the higher the iterative number is , the better the error code performance will be, the bigger the frame length is, the better the error code performance will be. Therefore in order to protect the reliability, the algorithms, iterative numbers and frame length shall be considered integratedly.