rt of the characters of self-organization, relay, multihop, and recon- figuration; and easy-to-develop and -apply new services and support of service convergence. The FuTURE mobile communication system will meet the users' requirements of communication with anyone, anywhere, in any way, and at any time, and the user will obtain versatile services, such as virtual reality, videoconferencing, accu- rate positioning, and high-definition real-time pictures. A lot of advanced tech- nologies, including OFDM, MIMO, and distributed network structure, will be adopted in the 4G system, and a new air interface will be provided to bring better experiences for terminal users. 2.1.3 FDD and TDD Branches of FuTURE Project The FuTURE project is composed of two branches: the FuTURE FDD system and FuTURE TDD system, both of which are investigating and demonstrating advanced techniques for systems to meet the application requirements around the year 2010. The two branches will be evaluated on a uniform trial platform. For both TDD and FDD, the trial platform contains six access points (APs) and 12 dis- tributed antenna arrays; each AP is equipped with two spaced antenna arrays. With excellent radio transmission performance, high-definition reactive video services © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3GPP LTE Radio and Cellular Technology have been performed and demonstrated on FuTURE trial systems. Although both TDD and FDD have their own advantages and disadvantages, TDD has some superiority in supporting asymmetry services and multihop functions. 2.2 FuTURE TDD System Beijing University of Posts and Telecommunications (BUPT) is responsible for the uplink design and trial system integration of the FuTURE TDD system. The univer- sity has finished the work of researching and developing China's first 4G TDD mobile communication system with the cooperation of the UESTC (University of Electronic Science and Technology of China), the HUST (Huazhong University of Science and Technology), and the SJTU (Shanghai Jiaot