Wireless Communication Link To The System Simulation Mapping Method

As an important component of the future communication techniques, wireless commnication technique, especially the mobile communication technique has become the most spectacular one in recent years in the communication techniques market. At present, WiMAX(Worldwide Interoperability for Microwave Access), which supports broad-band wireless access has gained wild attention. WiMAX is a broad-band wireless technique based on wireless MAN IEEE802.16. It can provide high speed data, voice and video transmission service in fixed and mobile environment. It features advantages of mobility,broad-band and IP technique. It is a promising technique with much developing potential in the future.Among many key techniques of IEEE802.16, Space-Time Coding is an important optional one. It induces space and time correlation at the transmitter side. The space division provides division gain. The space multiplex speeds up the transmission. It can make OFDM system behave much better. MIMO-OFDM is a great breakthrough in wireless mobile communication field. It can multiple the channel capacity and the frequency efficiency. Besides, it can strongly resist frequency-selective fading from channel. It is a key technique in the future.In order to evaluate a system's performance, the most important way is to simulate in system level. It is a simulation of the actual user and the system's action. In mobile communication, this simulation includes mobile station call, mobile station switch, base station acception, change of transmission environment, etc. Through simulation, we can get a vivid result about throughput. But this kind of simulation requires a hugh amount of calculation. This requirement narrows its actual application. Another commonly used way is to use an interface at the link layer. It defines an interface of the link level to the system level. Using a mapping function, we can estimate the system's performance through the link level simulation. It is a very useful engineering technique. Among many link level interface techniques, Exponential Effective SNR Mapping(EESM) is the most popular one. EESM is a link-to-system interface mapping function. It calculates the system's effective SINR to estimate its current performance. At present, 3GPP have already applied it to OFDM successfully.In this thesis, we mainly focus on the mapping way in the MIMO-OFDM system. We study the EESM(Exponential Effective SINR Mapping) application in OFDM, MIMO and MIMO-OFDM. The novel point in this thesis is that we point out MMSE-EESM way to calculate the effective SINR in MIMO system when it uses non-linear detection algorithm. We provide the corresponding simulation results and conclusion.The content in each chapter is shown as following.Chapter 1: Introduce the value of this project.Chapter 2: Introduce some physical level techniques in wireless communication, such as MIMO, OFDM. Then we can discuss the application of EESM in MIMO-OFDM.Chapter 3: Introduce the principle of EESM, analyze its application requirement.Chapter 4: Introduce the application of EESM in OFDM.Chapter 5: Introduce the application of EESM in MIMO. Point out MMSE-EESM way to calculate the effective SINR in MIMO system when it uses non-linear detection algorithm.Chapter 6: Introduce the application of EESM in MIMO-OFDM.At last, we provide the conclusion and furthur work.