PSSS based wireless communication for latency critical ultra-reliable communication in factory automation

在生产自动化中，传感器、执行器和控制系统之间的通信需要非常高的可靠性（BER≤10-9）和非常短的周期时间（< 0.1 ms）。100Mb/s的中等数据速率通常就足够了。无线网络是理想的，提供灵活性，移动性和易于安装。目前，还没有合适的解决方案可以实现所需的参数。在申请的项目中，需要考虑到目前很少被关注的平行序列扩频（Parallel-Sequence Spread Spectrum， PSSS）的概念，在此基础上研究是否有可能解决。工业无线电信道具有强反射的特点，这导致了信道传递函数的深衰减。这些可以通过高带宽PSSS系统（50-100MHz）与适当的系统参数选择相结合来补偿。本项目将研究与调制、错误保护、同步和信道均衡相关的研究问题，以及PSSS在编码不完全正交性和传输信道非线性影响下的具体特性。目的是开发一种解决方案，即使在上述关键的传播条件下也能提供所需的性能。获得了关于PSSS方法的基本知识，该方法也可以应用于无线电通信的其他应用。将与OFDMA方法进行比较。研究任务将在申请人工作小组之间明确界定的分工中进行，因此，从以前的联合项目中共同开发的结果，特别是BMBF项目ParSec，提供了一个很好的起点，因为这里已经有了较小带宽的PSSS系统的第一次经验，对周期时间和数据速率的要求明显较低。

Communication between sensors, actuators and control systems in production automation requires very high reliability (BER≤ 10-9) with very short cycle times (< 0.1 ms). Moderate data rates of 100Mb/s are usually sufficient. Wireless networking is desirable to provide flexibility, mobility and ease of installation. At present, there are no suitable solutions that can achieve the required parameters. In the project applied for, the concept of Parallel-Sequence Spread Spectrum (PSSS), which has so far received little attention, shall be taken up in order to investigate whether a solution is possible on this basis. The industrial radio channel is characterized by strong reflections, which lead to deep fades in the channel transfer function. These can be compensated by a high bandwidth PSSS system (50-100MHz) in combination with a suitable choice of system parameters. The research questions related to modulation, error protection, synchronization and channel equalization will be investigated in this project as well as specific properties of PSSS with respect to the imperfect orthogonality of the codes and the influence of nonlinearities of the transmission channel. The aim is to develop a solution that can provide the required performance even under the critical propagation conditions mentioned above. Basic knowledge about the PSSS method is gained, which can also be applied to other applications of radio communication. A comparison with OFDMA approaches will be performed.The research tasks will be carried out in a clearly defined division of labour between the working groups of the applicants, whereby the jointly developed results from former joint projects, in particular the BMBF project ParSec, offer a good starting position, since here already first experiences with a PSSS system of smaller bandwidth for significantly lower requirements concerning cycle time and data rate are available.