Research Of Interference Mitigation Schemes In TD-LTE

Wireless communication is one of the most developed technologies in recent years. The past 20 years has witnessed the exponential developing for cellular mobile telecommunication. The development of mobile telecommunication accelerates the combination of broadband wireless access and mobile telecommunication. Based on the trend of broadband for mobile telecommunication and threat from WiMAX technology,3GPP launches the project of LTE which adopts OFDM, MIMO, HARQ, AMC, RRM and other advanced technologies. LTE enhances the ability of air interface and can support more high-speed services.China takes an important role about TD technology. Therefore, the TD-LTE system is widely accepted as the next generation wireless telecommunication in China. Resource Block consists of time domain and frequency domain is used to transmit data, and LTE gets flexible time slots configuration. Based on the above characteristic, the scheduling of TD-LTE will be obviously different from conventional scheduling method.In the fast development of mobile telecommunication, from 1th to 4th generation, there is always a serious problem that the interference depresses the system's performance. Usually, the interference can be sort into two types:inter-system and intra-system interference. At the same time, intra-system still could be classified for inter-cell and intra-cell interference. Due to the characteristic of OFDM, and sufficient guard interval, intra-cell interference is almost ignored compared with other two types. However, the interference from the same frequency becomes more serious. Especially, for the cell edge users, if no some interference mitigation scheme, they will suffer grievous influence. What's more, with the limited frequency resource and increasing service, there will exists maybe two or more different mobile telecommunication system. Because' the non-perfect transmitter and receiver make the inter-system interference more harmful, it is significantly to research the frequency deploy and inter-system interference mitigation schemes.This paper discusses the LTE system interference which can be sort for three kinds mentioned above. First, we introduce intra-cell interference. And with the OFDM applied, this kind of interference is not the key one for research. Then, we make a deep research for inter-cell interference. From lots of detail paper research and analysis, a novel inter-cell interference mitigation scheme is proposed. And system level simulation is made to verify the scheme's improvement. At last, inter-system interference is analyzed and researched between TD-SCDMA and TD-LTE. Besides, a resource scheduling scheme is proposed to reduce inter-system interference in the non-full load system. Finally, the evaluation of coexistence between evolution system of LTE which is LTE-Advanced and TD-SCDMA is proposed.