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

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(误码率≤为10-9)和非常短的周期(&lt；0.1ms)。100Mb/S的中等数据速率通常就足够了。需要无线网络来提供灵活性、移动性和安装简便性。目前，还没有合适的解决方案可以达到所需的参数。在申请的项目中，应采用到目前为止很少受到关注的并行序列扩频(PSSS)的概念，以调查在此基础上是否有可能解决问题。工业无线电信道的特点是强反射，这导致了信道传递函数的深度衰落。这些可以通过高带宽PSSS系统(50-100 MHz)和适当选择的系统参数来补偿。本项目将研究与调制、差错保护、同步和信道均衡有关的研究问题，以及关于码的不完全正交性和传输信道的非线性的影响的PSSS的特殊性质。其目的是开发一种解决方案，即使在上述关键传播条件下也能提供所需的性能。掌握了PSSS方法的基本知识，也可应用于其他无线电通信领域。将与OFDMA方法进行比较。研究任务将在申请者的工作组之间明确界定的分工中进行，因此，以前联合项目，特别是BMBF项目PARSEC共同开发的成果提供了一个很好的起点，因为在这方面已经有了PSSS系统的第一次经验，该系统的带宽更小，对周期时间和数据速率的要求要低得多。

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.