连续相位调制系统的扩频码
Spread Spectrum Codes for Continuous-Phase Modulated Systems
摘要：
本文研究了二进制连续相位调制信号在类重复码下解调和译码的组合方法的理论性能。这种技术的动机是需要在高噪声状态下传输分组化或成帧的数据突发，在高噪声状态下，许多强大的短长度码是无效的。在强噪声的信道中，我们从数学上研究了这种组合方法的渐近比特出错率，并量化了随着码率的增加，分别执行解调和解码的性能改善。在这种情况下，我们还讨论了一个简单的变体的重复编码涉及伪随机码字，基于直接序列扩频方法，保留了频谱密度的编码信号，以保持抗窄带干扰。我们描述了数值模拟，证明了这种方法的优点，作为一个内部的代码，可以在现代编码方案下，在高噪声环境中使用。
英文摘要：
We study the theoretical performance of a combined approach to demodulation and decoding of binary continuous-phase modulated signals under repetition-like codes. This technique is motivated by a need to transmit packetized or framed data bursts in high noise regimes where many powerful, short-length codes are ineffective. In channels with strong noise, we mathematically study the asymptotic bit error rates of this combined approach and quantify the performance improvement over performing demodulation and decoding separately as the code rate increases. In this context, we also discuss a simple variant of repetition coding involving pseudorandom code words, based on direct-sequence spread spectrum methods, that preserves the spectral density of the encoded signal in order to maintain resistance to narrowband interference. We describe numerical simulations that demonstrate the advantages of this approach as an inner code which can be used underneath modern coding schemes in high noise environments.
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