哈尔滨工业大学工学硕士学位论文
Abstract
The construction of space information network (SINs) is an international scientific frontier and strategic height, which plays an important role in navigation positioning, ocean-going voyages, emergency rescue, relay communication, air transport, aerospace measurement and control, real-time transmission, and space exploration. The space nodes in SINs have features of complex topological structure, sparse nodes and poor controllability, which lead to long and dynamic propagation, randomly interrupted link and divided network. Recently, distributed/virtual multiple-input multiple-output (MIMO) technology over satellites have attracted considerable research interest due to the development of high throughput satellites (HTS) and SINs. In this paper, a novel performance analysis framework is proposed for MIMO with orthogonal space-time block coding (OSTBC) under Licklider transmission protocol (LTP) for emerging SINs, and the closed solutions of the related performance indexes are derived.
First, considering the reliability and effectiveness between two nodes in SINs, we characterize the operation and performance of LTP-HARQ scheme in SINs and establish the signal model based on OSTBC-MIMO system. From the perspective of information theory, we give the performance metrics of LTP-HARQ protocol such as transmission delay, the mean number of transmission rounds, throughput and energy consumption in the system model. Also, the classification methods of different HARQ and different fading modes are clarified and the mathematical tool of Laplace transform used in this paper is defined.
Based on the definition in system model, we use the Laplace Transform to obtain the closed expression of performance metrics for lossless HARQ, truncated HARQ and ARQ mechanism. Monte Carlo simulation and evaluation are carried on the performance metrics over different fading channel with Matlab, and the performance comparison about the mean number of transmission rounds and throughput are shown over the Nakagami-m fading channel. The analysis shows that the capacity and throughput under OSTBC-MIMO system are improved obviously by adopting the LTP-HARQ transmission mechanism. The minimum unit information energy exists which means we can obtain the least energy consumption if the unit information data is transmitted successfully.
Last, we give the performance analysis model for HARQ-IR mechanism in terms of the theoretical expressions and simulation results and obtain the definition of reliability for the transmission mechanism including HARQ-IR, HARQ-RR, truncated HARQ and ARQ. We prove that only HARQ-IR and HARQ-RR mechanism
哈尔滨工业大学工学硕士学位论文
are reliable for the red data transmission in LTP. To make the result more universal, the theoretical expression of each performance metric under Nakagami-m fading is given, and the simulation results are given.
In order to achieve the high capacity transmission of point to point communication in SINs, we adopt the OSTBC-MIMO system and analysis the transmission mechanism performance over different fading channels. For the requirements of reliability and effectiveness, we propose the LTP-HARQ mechanism. The maximum/minimum problems of throughput and unit information energy are discussed, and five theorems are obtained about, which provides the performance framework in point to point communication and reference for the reality of high capacity, high speed, high reliability, low delay and low power consumption in SIN.
Keywords:space information networks, licklider transmission protocol, hybrid automatic repeat request, multiple-input multiple-output, fading channel