Improve Transmission Capacity Research Articles

Performance evaluation of split transmission in multihop wireless networks

Multimedia applications in multihop wireless networks have great market potential. Multiple channels and multiple radios are commonly used for exploring multimedia transmissions in multihop wireless networks. Split transmission allows multiple channels attached to different radios simultaneously to be used, and so to achieve a fundamentally improved transmission capacity. The goal of this paper is to present a theoretical background to justify the improved performance of the split transmission. We theoretically study and prove that, by using the split transmission, the worst-case delay is decreased to $\frac{\sigma\rho_{k-1}}{LC_{m-1}C_{k-1}}$ of that without using the split transmission, the average throughput is increased to $\frac{1}{1-\prod_{j=0}^{k-1}\alpha_j}$ of that without using the split transmission, and the average delay jitter is decreased to $\frac{C_{k-1}C_{\rho}}{C_{m-1}[C_{\rho}+L(\rho+C)]}$ of that without using the split transmission. We believe that this is the first attempt to consider split transmission in theory. We also evaluate the performance of the split transmission in ns-2 simulations. The observed results show that the split transmission achieves shorter worst packet delays, higher average throughput, and smaller average delay jitter as compared to the performance achieved without the split transmission.

The use of interactive graphics in exploration and mine planning

Underwater wireless optical communication (UWOC) is an emerging and feasible underwater communication technology and has developed rapidly in recent years. Building a high-performance and practical UWOC system requires comprehensive consideration and optimization design from the device to the system, as well as from the internal modulation to the external environment. This paper provides an overview of the recent developments in UWOC systems, covering aspects about the system transmitters and receivers, advanced modulation formats and underwater channels. Some key technologies to improve transmission capacity of UWOC are classified and summarized to provide guidance for system design. The main challenges and perspectives to achieve a reliable UWOC system are also mentioned. The summary and analysis of these advances and techniques will shed light on the future development of UWOC technology and assist in the construction of the internet of underwater things.