IEEE 802.16m擁有高傳輸速度與高頻寬的優點，因此在未來它將在無線通訊系統中扮演著重要的角色，在IEEE 802.16m裡我們時常在二維Resource Block中的某些位置上插入pilot，並且去估測出這些pilot的通道頻率響應，使用這些估測出的通道頻率響應來估測出Resource Block中的其他位置的通道頻率響應，本論文在插入這些pilot時考慮了三個議題，在Resource Block中使用最小的pilot數量以便於放置最多的傳輸資料，但它仍需要有足夠的pilot數量來準確地估測出通道的頻率響應，同時，這些pilot必須能夠在適當的場所減少行動台的使用者與基地台間之干擾，本論文中提出設計的程序在於如何去估計pilot與pilot之間的干擾，如何計算pilot在Resource Block中的佔有率，如何放置pilot的位置可以產生最低的干擾；在通道頻率響應的估測中我們使用了最小平方差以及最小均方差兩種方法，基於我們所提出的pilot設計方式，我們提出了一幾個2x2 MIMO系統中pilot放置的例子，並且對模擬這些例子對於系統的干擾程度並且使用MMSE估測出通道頻率響應，使用這些模擬的結果來證實我們的設計理念與模擬的演算法是否正確。 For IEEE 802.16m system it possesses the advantages of high transmission speed and broad bandwidth it will play an important role in the future wireless communication services. In IEEE 802.16m system it usually inserts pilot tones in certain locations of the two dimensional Resource Block to estimate the channel impulse responses at those locations and then uses certain interpolation techniques to find the channel responses at other locations. Three issues need be considered in the insertion of these pilots. It needs to use a minimum number of pilot tones so as to reserve maximum number of resources for data transmission, but it needs to have enough pilot numbers so as to generate accurate estimate of the channel impulse responses and meanwhile it needs to insert these pilots at proper locations to minimize the possible interferences from outer base stations and mobile users. In this thesis we propose the design procedures of how to measure the interference between pilots, how to calculate the pilot occupancy percentage, and how to insert pilot locations to generate possible minimum interferences. In the channel impulse response estimation both the least square (LS) and the Minimum Mean Square Error (MMSE) are considered. Based on our pilot design principle we propose the number and locations of pilots in 2 x 2 systems, and to simulate the resulting system interference levels and to find the resulting MMSE in the channel impulse response estimation. It will use the simulation results to validate our design principle and simulation algorithm.
