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題名 | PACS個人通信服務系統同頻干擾模擬研究=A Study of PACS Personal Communication Service System Co-Channel Interference |
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作 者 | 蔡育仁; 廖宏祥; | 書刊名 | 電信研究 |
卷期 | 26:3 1996.06[民85.06] |
頁次 | 頁421-434 |
分類號 | 448.815 |
關鍵詞 | PACS; 個人通信服務系統; |
語文 | 中文(Chinese) |
中文摘要 | 個人進接通信系統(PACS)已經被接受為美國1.9GHz個人通信服務(PCS)的標準之 一,交通部電信研究所目前除研發此系統雛型外,亦正進行此系統的試用計畫。頻率重複使 用參睥在行動電話系統中,是一個相當重要的參數,此參數的選取將影響到同頻干擾量的大 小(即通話品質)及系統容量,因此必須在此二者之間尋求平衡,取得適當的頻率重複使用 參數。同頻干擾的大小除了受到頻率重複使用參數的影響之外,尚受到傳播環境之遮蔽效應、 天線分集、功率控制及通道佔用率等因素的影響。本文以模擬的方式來探討這些因素對PACS 訊號品質的影響,並尋求適切的頻率重複使用參數。由模擬結果可以發現,遮蔽效應將大幅 度的降低訊雜比,而功率控制及天線分可以有效的改善系統效能。在訊號品質及系統迥量的 考量下,頻率重複使用參數等於16似乎是較佳的選擇。 |
英文摘要 | PACS (Personal Access Communications System) has been accepted as one of the 1.9GHz PCS standards in North America. TL (Telecommunication Laboratories) is currently implementing PACS prototype including handset, radio ports, radio port control units and network technology; meanwhile, the pre-commercial trial on PACS in DGT (Directorate General of Telecommunications) is under processing by TL. In mobile cellular communication systems, frequency reuse factor is a critical parameter and will influence the co-channel interference (i.e. signal quality) and system capacity. In order to keep an acceptable signal quality and maximize the system capacity is also influenced by shadowing effect, antenna diversity, power control and channel occupancy. In this article, the performance of PACS is evaluated via computer simulations, and all the influencing factors are considered. It is shown that shadowing effects significantly degrade the C/I, and both power control and antenna diversity will improve the system performance effectively. Reuse factor N=16 seems to be a better choice in terms of signal quality and system capacity. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。