文档介绍：毕业设计(论文) 摘要在数字通信系统中, 通常采用差错控制编码来提高系统的可靠性。自P. Elia s 首次提出卷积码编码以来,这一编码技术至今仍显示出强大的生命力。目前,卷积码已广泛应用在无线通信标准中,如 GSM , CDMA2000 和 IS-95 等无线通信标准中。针对 N-CDMA 数据传输过程中的误码问题, 本文论述了旨在提高数据传输质量的维特比译码器的设计。虽然 Viterbi 译码复杂度较大,实现较为困难,但效率高,速度快。因此本文着重分析和讨论了 1/2 速率的( 2,1,9 )卷积码编码和其 Viterbi 译码算法。深入研究卷积码编码原理和 Viterbi 算法原理后,提出了( 2,1,9 )卷积码编码以及 Viterbi 算法的初始化、加—比—选和回溯设计方案,运用查表的方法,避免了大量繁琐计算,使得译码简洁迅速,译码器的实时性能良好。并充分利用 TMS320 C54X 系列 DSP 芯片,用汇编语言完成了( 2,1,9 )卷积码编码和 Viterb i 译码的程序。关键词:差错控制编码、卷积码、 Viterbi 译码、 TMS320C54X 、DSP 毕业设计(论文) Abstract In munication systems, error control coding is usually used to improve system reliability. Since put forward the convolutional coding the first time, the coding is still showing strong vitality.,has e widely used in munications, munications and many munication systemsas a kind of channel coding method. such as GSM, CDMA2000 and has been a munication standards of IS-95. In view of the error problem in the process of N-CDMA data transmission, this paper discusses the aims to improve the quality of data transmission of victor design than the decoder. Although Viterbi plexity is bigger, more difficult to achieve, but high efficiency and fast speed. So this article emphatically analyzed and discussed the 1/2 rate (2,1,9) convolution code coding and its Viterbi decoding algorithm. In-depth study on principle of convolution code coding and Viterbi algorithm, proposed the convolution code coding and Viterbi algorithm (2,1,9) initialization, add - than - choose and back design, using look-up table method, to avoid a large amount of tedious calculation, the decoding and quick, good real-time performance of the decoder. Make full use of the series of TMS320C54X DSP chip, using assembly language plete the ( 2,1,9 ) convolution code coding and Viterbi decoding process. Keywords: error control coding, convolutional code, Viterbi decoding, TMS320C54X 毕业设计(论文) 目录摘要...........................................................................................................