Based on the constellation diagram of the different modulations, a novel S and Π-decision rule is designed for the analog demapper of the orthogonal frequency-division multiplexing (OFDM) systems. The dedicated short...Based on the constellation diagram of the different modulations, a novel S and Π-decision rule is designed for the analog demapper of the orthogonal frequency-division multiplexing (OFDM) systems. The dedicated short-range communications (DSRC) system is chosen as an OFDM platform to compare the performance among the proposed S and Π-decision decoder, hard-decision and soft-decision decoders. Simulation results demonstrate that both the complexity and performance of S and Π-decision demapper used for M-ary quad-rature amplitude modulation (QAM) OFDM system can be greatly improved. The number of decisions be-tween the received symbol and constellation points can be simplified to look up table times for M-ary QAM OFDM system.展开更多
首先阐述了车联网的一些概念,车联网是一种物联网,是在道路交通网络中的具体应用,并从车联网的三个层次,感知层、网络层和云平台进行阐述。接着介绍了车载专用短程通讯技术(Dedicated Short Range Communication,DSRC)中的IEEE802.11p...首先阐述了车联网的一些概念,车联网是一种物联网,是在道路交通网络中的具体应用,并从车联网的三个层次,感知层、网络层和云平台进行阐述。接着介绍了车载专用短程通讯技术(Dedicated Short Range Communication,DSRC)中的IEEE802.11p协议和IEEE1609标准,其中IEEE802.11p是从IEEE802.11协议扩充来的,IEEE1609标准为车载网络提供了有效的存取方式。最后针对交通路口的事故频发的问题,提出了一种基于DSRC技术的智能交通路口模型的车联网解决方案。展开更多
文摘Based on the constellation diagram of the different modulations, a novel S and Π-decision rule is designed for the analog demapper of the orthogonal frequency-division multiplexing (OFDM) systems. The dedicated short-range communications (DSRC) system is chosen as an OFDM platform to compare the performance among the proposed S and Π-decision decoder, hard-decision and soft-decision decoders. Simulation results demonstrate that both the complexity and performance of S and Π-decision demapper used for M-ary quad-rature amplitude modulation (QAM) OFDM system can be greatly improved. The number of decisions be-tween the received symbol and constellation points can be simplified to look up table times for M-ary QAM OFDM system.
文摘首先阐述了车联网的一些概念,车联网是一种物联网,是在道路交通网络中的具体应用,并从车联网的三个层次,感知层、网络层和云平台进行阐述。接着介绍了车载专用短程通讯技术(Dedicated Short Range Communication,DSRC)中的IEEE802.11p协议和IEEE1609标准,其中IEEE802.11p是从IEEE802.11协议扩充来的,IEEE1609标准为车载网络提供了有效的存取方式。最后针对交通路口的事故频发的问题,提出了一种基于DSRC技术的智能交通路口模型的车联网解决方案。
