Very-High-Throughput Millimeter-wave Wireless Sensor Communication Network

Very-High-Throughput Millimeter-wave Wireless Sensor Communication System (VHT-MSCN) based on millimeter-wave technique and optical fiber communication technology is one of representative perspectives for Wireless Sensor Network. VHT-MSCN provides more intuitive sensing information than traditional ones and is a potential candidate to meet the requirement of system safty monitoring. This dissertation is supported by National Natural Science Foudation of China under Grant No.60736003. In this dissertation, system characteristics and realizations of VHT-MSCN are particularly studied. The main innovations are listed as follow:(1) The architecture configuration of novel VHT-MSCN is particularly established for Very-High-Throughput information collecting and transporting based on MM-wave RoF techniques. The objective of this research is to seamlessly deliver multi-gigabit high-speed sensing data through the integration of MM-wave and optical fiber subnets. Fundamental specifications on various network nodes, including SM, RM, RAU, OLT and DCC, are discussed in detail. Especially, Functionality designs on SM and RM frameworks are presented with module platforms. The hybrid communication interfaces and interconnetions for proposed optical-wireless integrated network are also studied in our work. According to the evolution of MM-wave CMOS technics, road maps on system structure, interfaces and throughput are specifally clarified for next decade. To enhance system energy efficieny, power management that involves internal energy streaming of MM-wave nodes are also illustrated by using EHM.(2) A novel mathimatical energy models for both SM and RM are proposed for calculating power consumption in no-contention system. MM-wave multiple access techniques based on TDMA, FDMA/OFDMA and FD-TDMA are studied. Compared to other two proposed schemes, FD-TDMA shows its comprehensive potential on cost and energy efficiency for proposed VHT-MSCN by simulation results. Refer to ECMA387 which is the first standard around 60 GHz with a 8.64GHz bandwidth, a specific FD-TDMA access scheme with high energy efficiency is presented for different network topologies including 1:32 (RM:SM), 1:64 and 1:128. The energy consumption and battery lifetime of SM and RM in this scheme are investigated by using our proposed energy calulating models. FD-TDMA(3) MAC protcols based on TDMA, FDMA/OFDMA and FD-TDMA multiple access techniques are also specifically designed. A high energy-efficient Superframe and operation state shiftings of SM and RM in MAC protocol are specially studied. FD-TDMA is proved with its superorities both in operating energy efficency and realizing complexity.(4) The proof-of-concept experimental testbeds of proposed VHT-MSCN up and down-link transmission are partiucularly estabilished and demonstrated for future applications. In uplink,1.8Gbit/s high-speed sensing data from different SMs are aggregated to RM by using FDM. After relayed to RAU by RM, collected data go into optical fiber subnets and finally reaches DCC; In downlink, DCC send configuration information (10Gbit/s) to every nodes through the optical-wireless network by using 60GHz RoF techniques.(5) To achieve low-cost 60 GHz RoF system for potential VHT-MSCN applications, two advanced methods are proposed and demonstrated in this dissertation:?Polymer optical fiber (POF) is adopted as the low-cost short-distance transmission media of optical 60GHz RoF signal. Meanwhile, to overcome the multi-mode dispersion from POF, multi-carrier modulation such as OFDM is investigated as ideal carrier format in 60 GHz RoPOF system.?The optical mm-wave generation with two free-running lasers at transmitter and electrical down-conversion with reflective self-mixing effect at receiver are proposed and investigated to simplize the mm-wave generation scheme to dispense with LO and OPLL and lower the cost of 60GHz RoF system.(6) According to the transmission characteristics of 60GHz MM-wave, the method to reduce OFDM signal transmision overhead induced by pilot and training sequency is discussed detailly.60 GHz OFDM-ROF experimental platform provides a comparison with other schemes, especially the frequence selected loss of 60GHz radio signal, to prove that when transmittng data with the same length, the phase shiftting accumulation of 60GHz radio signal is not serious enough to cause sever deterioration. In contrast, excrescent pilot suffers from random noise which can induce unexpected deep distortion in the following frequency equalization.(7) To ehanced the energy efficiency of proposed VHT-MSCN, error correcting codes including Convolutional code and Low Desity Parity Check (LDPC) code are adopted to discrease the transmitting power for both optical and wireless subnets:?In 60GHz RoF experimental demonstration,16QAM-OFDM data precoded by convolutional code is delivered through optical fiber and air-link with a lower transmitting power than without coding to achieve the same BER performance, which can significantly conserve the energy in SM or RM's battery to extend their working lifetime.?In optical subnet, LDPC code performance is investigated by using 100G high-speed optical transmission testbed and proved to reach a identical transmission with lower power consumption of optical transmitter, which leads a great improvement on energy efficiency for VHT-MSCN.