摘要
本論文研究針對IEEE 802.16e行動終端上鏈對基地台的同頻干擾，利用MATLAB程式運算出IEEE 802.16e上鏈同頻干擾相鄰區域基地台的干擾狀況，提供了因系統間干擾所引起的IEEE 802.16e系統性能下降分析結果，進一步比較同頻干擾影響的程度。在頻譜資源有限的情況之下，本研究整理出可能造成干擾的情況，透過計算同頻干擾值和基地台佈建方向、基地台距離、用戶多寡的關係；並分析增加基地台之間的距離、頻率規劃與最大用戶數上限設定等等調整干擾情境，以及模擬出總干擾對整體通訊系統的影響程度。
從模擬結果得知，經過修正後的COST-231 Hata路徑損失模式，計算出可接受的路徑損失，再算出可接受的細胞範圍為250公尺，而終端與基地台間距則以20~250作亂數分配。不論是單層或雙層基地台終端干擾，若在QPSK 1/2調變方式下，基地台半徑在250公尺，終端功率限制在最大功率200mW時，終端上鏈運用同頻率訊號進行傳輸時，總系統覆蓋率皆可達九成以上，此調製方式可以滿足同頻率重覆使用的需求。在多基地台雙層干擾終端的情況下，16QAM 1/2調變系統中用戶數多寡為影響容量的顯著因素，且雙層基地台終端同頻干擾較單層基地台終端干擾嚴重，隨著基地台終端用戶人數越多，同頻干擾程度越大。

Abstract
This research concerns about how the uplink of MSs (Mobile Stations) interfere with a victim BS (Base Station) using the same frequency channel in IEEE 802.16e system. The uplink co-channel interference scenarios proposed by our work are simulated within the adjacent area and the same frequency bands by MATLAB. The numerical results also indicate the overall IEEE 802.16e system performance declines due to intra-system interference. Owing to the limitation of radio frequency resources, we analyze the situation with the proposed interference scenarios, which are mainly differentiated by the network deployment, separation distances of BSs and the number of users. Also, we further analyze the performance by adjusting such interference-related terms including the distance between the BSs, the frequency planning, and the maximum number of users. Then the total interference effect for the communication system can be obtained.

A revised COST-231 Hata model is used to get the acceptable path loss, and then the acceptable range of a cell is calculated. In the simulations, the distance between the mobile and the base station is set to the random distribution in the range of 20-250 meters. The simulation results show that the total system capacity can reach over 90 percent under the following conditions: QPSK modulation with 1/2 code rate, the BSs radius of 250 meters, the MSs at the maximum radiation power of 200mW, and radiation under the same frequency. Moreover, in the situation of two-tier interfering and 16QAM modulation with 1/2 code rate, the number of users is the most significant factor affecting the system capacity. And the situation of co-channel interference in the two-tier interfering MSs has greater capacity loss than the one-tier interfering MSs. Finally, when the amount of users that served by the specific BS increases, the effect caused by co-channel interference will even more serious.

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