论文标题
延迟优化常规的非连锁差分CPM检测
Delay Optimization of Conventional Non-Coherent Differential CPM Detection
论文作者
论文摘要
连续相位调制（CPM）的常规非辅助差分检测对于通道障碍（例如相位和多普勒偏移）非常可靠。它的实现最为简单。它包括将接收到的基带信号乘以一个符号周期的共轭和延迟版本。但是，与最佳相干检测相比，它具有信噪比差距。在本文中，我们通过使用高于一个符号周期的延迟来提高常规差分检测的错误率性能。我们得出了格子描述以及分支机构和累积指标，这些指标考虑了$ k $符号周期的延迟。然后，我们根据两个差分信号之间的最小欧几里得距离得出$ K $的优化标准。我们最终确定了一些流行的CPM格式的优化延迟，其值通过错误率模拟确认。
The conventional non-coherent differential detection of continuous phase modulation (CPM) is quite robust to channel impairments such as phase and Doppler shifts. Its implementation is on top of that simple. It consists in multiplying the received baseband signal by its conjugate and delayed version of one symbol period. However it suffers from a signal-to-noise ratio gap compared to the optimum coherent detection. In this paper, we improve the error rate performance of the conventional differential detection by using a delay higher than one symbol period. We derive the trellis description as well as the branch and cumulative metric that take into account a delay of $K$ symbol periods. We then derive an optimization criterion of $K$ based on the minimum Euclidean distance between two differential signals. We finally determine optimized delays for some popular CPM formats whose values are confirmed by error rate simulations.
