Flexible Resource Allocation for SC-FDMA in LTE

• Main Authors: Zong-Han Cai, 蔡宗翰
• Other Authors: Hwang-Cheng Wang
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/38243545534684735889

碩士 === 國立宜蘭大學 === 電子工程學系碩士班 === 100 === The purpose of this thesis is the discussion and comparison of different allocation schemes of resource blocks in a frequency division multiple access system. Orthogonal frequency division multiple access (OFDMA) has been selected as the downlink access scheme for LTE and WiMax, whereas single carrier frequency division multiple access (SC-FDMA) and OFDMA are chosen as the uplink access schemes for LTE and WiMax, respectively. Resource allocation results will affect the quality of service offered to individual users. Most of the resource allocation methods in literature only apply to the case when the number of resource blocks is an integral multiple of the number of users. In reality, such situations are rare. For example, the probability of the number of resource blocks being a multiple of 64 users is only 1/64. Therefore, we propose dynamic resource block allocation schemes for situations in which the number of resource blocks is not divisible by the number of users. Consequently, the number of resource blocks assigned to individual users is not necessarily equal. The three methods proposed in the thesis are Maximum Fairness Greedy, Compensatory Worst Resource Avoidance, and Compensation Enhanced Greedy. The steps involved in each method are described and illustrated with examples. The time complexity of various methods is analyzed and compared against each other. Simulation results show that the proposed methods are superior to existing methods in fairness, capacity, bit error rate, and flexibility.