Problem Solving 101 with Xu Zhu

At Artech House, we ask our authors what problems their books can help readers solve. In this series, we share what our authors aim to do in their writing. Read on to find out what Xu Zhu, who wrote Hybrid Wireless-Power Line Communications for Indoor IoT Networks, had to say:

The book introduces a novel communication system for an IoT network named as white space- broadband power line communication (WBPLC), which combines broadband power line communication (BPLC) and TV white space (TVWS) wireless communications in very high frequency (VHF) band. Amendments to current BPLC standards are suggested to organize sharing the VHF band between BPLC and TVWS. With WBPLC the following problems are solved.

  • The interference problem between BPLC and TVWS in an IoT network is solved as the two techniques share the same frequency band. The allowed transmission power of BPLC is raised without causing any further interference to wireless communication.
  • The coverage area of BPLC is extended, with TVWS as an effective complementary solution. The system throughput is also enhanced.

The book also investigates the performance improvement in terms of network lifetime in the hybrid wireless-PL sensor networks for in-door IoT in ultra high frequency (UHF) band through cross-layer design.

  • Maximization of the network lifetime limited by battery energy supply to wireless sensors is studied through joint design of physical (PHY), medium access control (MAC) and network layers. Closed-form expressions of the globally optimal solution for lifetime maximization of the hybrid sensor network are derived for the linear topology. Such closed-form solutions give insights in factors that are significant to the network lifetime when designing the hybrid sensor network. Impacts of different network configurations such as source rate, sensor node densities, etc., on the hybrid network lifetime are investigated. The impact of different transmission strategies of PL nodes on the effectiveness of the network is studied.
  • A hybrid video sensor network which comprises both battery-powered wireless sensor nodes and PL sensor nodes is proposed to maximize the network lifetime. The joint design of video encoding rate, aggregate power consumption, channel access control, along with link rate allocation is studied for maximizing the hybrid network lifetime. A distributed algorithm is proposed for the network lifetime maximization problem. The distributed algorithm divides the computational burden among all nodes with much lower communication overhead. The impact of dynamic network change and network scalability is studied.

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