| 摘要: |
| 本文以传统单正交码扩频技术为基础，提出了一种双多进制正交码扩频 4DPSK的复合调制方式，以进一步提高频谱利用率。首先给出了复合调制方案以及采用最大后验概率(MAP)准则的最佳非相干接收方法，其次提出了适合Turbo乘积码(TPC)SISO(软输入软输出)译码的软判决信息提取算法，最后测试了系统在高斯白噪声信道下的误比特性能。仿真表明该系统可以获得比传统正交扩频系统更高的抗噪声干扰能力，引入TPC编码技术后性能有较大改善。 |
| 关键词: 双多进制正交码扩频 解扩 非相干接收 Turbo乘积码 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:国家973计划项目，国家自然科学基金资助项目(60272079) |
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| Performance Analysis of a TPC Coded Dual M-ary Orthogonal Code Spread Spectrum System |
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| Abstract: |
| This paper investigates a hybrid system with dual orthogonal code spread spectrum and 4DPSK to improve the spectrum efficiency. Firstly, the noncoherent reception method based on the MAP criterion is discussed. Secondly, a soft decision output algorithm that can be employed by the TPC (Turbo Product Code) SISO(Soft in Soft out) decoding is proposed. Finally, the bit error rate is measured in AWGN channel. The result of simulation shows that the hybrid system has excellent performance especially with the TPC coding. |
| Key words: Dual orthogonal code spread spectrum,Despreading,Noncoherent reception,Turbo product code |
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