信息工程学院本科毕业论文(2025 届)题 目基于 LDPC 码的编码协作通信讨论系通信工程专 业通信工程班 级08093412学 号08934237学生姓名余磊石指导老师郭锐完成日期2025 年 1 月摘 要 采纳空间分集的方法可以有效地对抗无线信道中的衰落。由于受到体积、重量、成本等因素的限制,在无线通信系统的用户终端上实现多天线技术较为困难。 而在单天线的无线用户间通过协作,共享天线,可以实现虚拟的多天线。协作通信方式是解决通信系统容量不断增加的重要方法,协作通信系统中采纳LDPC 码,可以有效改善中继节点处的差错传播带来的系统性能下降。 低密度奇偶校验(LDPC) 编码是一种性能优良的线性分组码,利用其码字内码元间固有的相关性,通过不同的用户发送码字的不同部分,可以实现虚拟的多发送天线,获得发送分集增益,在不增加系统带宽和发射功率、系统复杂度也不会明显增加的情况下能显著地提高系统性能。本文给出了 LDPC 码的基本编解码原理,阐述了基于 LDPC 码的协作通信系统的分析模型,给出相应的仿真结果和分析。关键词:衰落;协作通信;分集;多天线; LDPC 编码;编码协作ABSTRACTSpatial diversity is an effective method to resist fading effect in wireless channel. Due to the limitation of size weight and cost, it is difficult to use the multi antenna technique on the terminal of wireless communication. Cooperative communication allows the mobile terminals with a single antenna to share their antennas. Thus virtual multi antenna can be created to realize transmitting diversity. Cooperative communication is an important scheme to meet the increasing requirement of capacity of communication system .Performance degradation due to the error propagation on the relay node can be improved effectively by using LDPC codes in the cooperative communication system. LDPC code is a good linear block code. Because of the intrinsic coherence among the bits of the code word, we can create virtual multi antenna and obtain diversity gain by making different users transmit different parts of the c...