Task: Question Answering
Input (English): Context: Cross - Layer Adaptive Feedback Scheduling of Wireless Control Systems . ( arXiv:0809.4924v1 [ cs . NI ] ) There is a trend towards using wireless technologies in networked control systems . However , the adverse properties of the radio channels make it difficult to design and implement control systems in wireless environments . 
Question: What may be the purpose of the post ?
Output (English): To describe technology.