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1、Final Project for the BUPT QMUL Joint Programme ee05b127 Page1 4 27 2009 Undergraduate Project Report Inter cell interference cancellation in OFDMA network Name Geng Ziwei Programme Telecommunication Engineering with Management Class 05B05 Student No ee05b127 052862 Supervisor Liang Dong 2009 4 26 F
2、inal Project for the BUPT QMUL Joint Programme ee05b127 Page2 4 27 2009 北北 京京 邮邮 电电 大大 学学 本科毕业设计 论文 任务书本科毕业设计 论文 任务书 Project Specification Form 学院 School International School 专业 Programme Telecommunications Engineering with Management 班级 Class 05B05 学生姓名 Name Geng Ziwei 学号 Student No 052862 ee05b127
3、 班内序号 No in Class 23 指导教师姓名 Supervisor Liang Dong 职称 Academic Title Dr 设计 论文 题目 Project Topic Inter cell interference cancellation in OFDMA network Research 题目分类 Scope 1 工程实践类 研究设计类 1 2 类中各选一项在 内打 1 Implementation Research 2 软件 硬件 软硬结合 非软硬件 2 Software only Hardware only both N A 主要任务及目标 Main task an
4、d target Build up a mathematic model of the cancellation in OFDMA network and simulate it with Matlab to achieve the target that getting the balance of the ICI mitigation and spectral efficiency decrease the cancellation and improve the spectral efficiency as much as possible 主要内容 Project descriptio
5、n OFDMA orthogonal frequency division multiplex access is a future broadband wireless multiple access technique It has a merit to hold intra cell orthogonality in addition to the advantages of compensating the frequency selectivity which inherits from orthogonal frequency division multiplexing OFDM
6、Since OFDMA systems use frequency division multiplexing the appropriate frequency reuse factor is required for multi cell environments If two neighboring cells use the same subcarrier the transmission in one cell interferes with that in the other cell called as ICI problem So the project aim is that
7、 find a appropriate way to cancel the Inter cell interference as much as possible the system can employ techniques like spectrum spreading and multiple receiver based interference suppression The most famous way for handling ICI is to design the frequency reuse factor such that the two neighboring c
8、ells allocate subcarriers exclusively However since the exclusive usage of sub band for each cell decreases spectral efficiency the better efficient strategy is required to increase total system throughput by balancing ICI mitigation and spectral efficiency This project is focused on this problem 主要
9、参考文献 Main references 1 Hang Lizhu Wang Hua Matlab electronic simulation and implementation National Defence Industry Press 2 Wu Deben Li Huimin Introduction of Telecommunications Technology Posts the low part is the receiver link The transmitter converts the digital signal to the mapping of the sub
10、carrier s range and phase and begins Invert Discrete Fourier Transform Convert the frequency domain to the time domain IFFT and IDFT is similar in function but with high computing efficient and applied to all systems The receiver is the invert and transmitter operation Mix the Radio Frequency signal
11、 and base band signal Then use FFT to convert and decompose the frequency signal the range and phase are converted to the digital signal IFFT and FFT are inverse transform Because of the FFT operation is similar to the IFFT Then the transmitter and receiver can use the same hardware equipment My pro
12、ject is focus on the Soft frequency Reuse Scheme the Power allocation is the factor of my consideration in my project I will choose the optimal Power Allocation ratio to increase the SINR in the cell and improve the capacity of this system The final project paper is organized as Abstract Introductio
13、n Background Design Result and Discussion Conclusion Final Project for the BUPT QMUL Joint Programme ee05b127 Page5 4 27 2009 CHAPTRER 2 Background knowledge 2 1 Frequency reuse strategy With the GSM900MHz digital communication network s rapidly developing in many areas the frequency resource become
14、 more and more scarce In order to satisfy the requirement of the telecommunication business some cities have already expanded the GSM frequency bandwidth to 12 2MHz Even though the frequency resource is still deficient In the condition of the analog network can not dismiss the frequency bandwidth It
15、 becomes the most attractive problems that concerned by the mobile telecommunication operators and many manufacturers The frequency reuse is that adjacent cells assigned different frequencies to avoid interference or crosstalk it covers the different region the whole or part of the region with secto
16、r antenna served by a base station by using the single frequency bandwidth These regions which used the same the frequency should separated by a certain distance to satisfy that the interference caused by a same frequency is reduced in a certain range In the mobile telecommunication systems the bandwidth is limited and valuable so we should enhance the frequency reuse efficiency to the best of our abilities I will introduce a kind of frequency reuse strategy which based on OFDMA Figure 2 Example
