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題名 | Radio Coverage of Mobile Cellular CDMA Systems=行動細胞狀分碼多址進接系統之無線電波涵蓋範圍 |
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作者 | 袁敏事; 姜仲鴻; | 書刊名 | 中華工商專校學報 |
卷期 | 18 1999.03[民88.03] |
頁次 | 頁175-196 |
分類號 | 448.84 |
關鍵詞 | 細胞狀分碼多址進接系統; 細胞內干擾; 基地臺天線; 陸地行動無線系統; Cellular CDMA system; Intra-cellular interference; Base station antenna; Land mobile radio system; |
語文 | 英文(English) |
中文摘要 | 行動細胞狀分碼多址進接(CDMA)系統的無線電波涵蓋範圍是由細胞半徑大小來決 定,此細胞半徑與功率強弱、細胞內及細胞間之干擾有關。本文中之 CDMA 系統的處理增益 是 128,工作作頻率是 900MHz,頻寬是 1.25MHz。 由於手機發射功率的限制,涵蓋半徑強 調在上鏈通訊。 使用者手機的天線高度是 1.5 公尺,最大發射功率是 30dBm。首先是單個 手機在基地臺天線在 100 公尺及 200 公尺之純路徑損失通道的涵蓋半徑被計量出來。接著 使用功率控制技術來補償 lognomal 及 Rayleigth 之衰減, 對於 lognomal 衰減, 它有 16.8 及 13.6 功率邊緣的需求, 分別提供 GOS2% 及 5%, 對於 Rayleight 衰減則需要 10dB 功率邊緣。 一個 100 公尺高的天線在 GOS 分別為 2% 及 5% 的涵蓋半徑分別減少 86% 及 81%。當位元插入及通道編碼技術被使用時,不佳的功率控制對涵蓋半徑並無影響。 在多路徑的細胞環境下有細胞內及細胞間之干擾,在最大容忍損失上有 5.4dB 之減少。 對 於 100 公尺及 200 公尺高度的基地臺天線的涵蓋範圍之損失百分比是 32% 及 34%。對 5% 的 GOS 而言,涵蓋半徑是 37 及 65Km。對 2% 的 GOS 而言,涵蓋半徑是 30 及 52Km。 |
英文摘要 | The radio coverage of mobile cellular CDMA systems is evaluated in terms of their cell radius, and the effect of power control, intra-and inter-cellular interference on coverage radius is also investigated, where the system has a processing gain of 128, an RF frequency and bandwidth of 900 and .25MHz, respectively. The coverage radius is emphasized on the up-link due to the limited transmitted power of a mobile. Mobile users is assumed to have an antenna elevation of 1.5 meters and a maximal transmitted power of 30dBm. First of all, the coverage radius of the single user case is calculated in pure path loss channel for a BS antenna elevation of 100 and 200 meters. In addition to pure path loss, power control is also to compensate lognomal and Rayleigh fading, where a 16.8 and 13.6 power margin are needed for the lognomal fading to provide a grade of service (GOS) of 2% and 5%, respectively, and a 10 dB power margin is considered for Rayleigh fading. For an BS antenna elevation of 100 meters, the percentage decrease in coverage radius is radius is 86% and 81% for a GOS of 2% and 5%, respectively, while for an antenna elevation of 200 meters, it is 87% and 83%, respectively,. Imperfect power control has no effect on the coverage radius when bit interleaving and channel coding techniques are employed. Due to intra-and inter-cellular interference in multiple cellular environments, there is a 5.4dB decrease in maximal tolerable loss, corresponding to a percentage radius decrease of 32% and 3% for a BS antenna elevation of 100 and 200 meters, respectively. For a GOS of 5%, the corresponding coverage radius is 37% and 65 km for a BS antenna elevation of 100 and 200 meters, respectively, while it is 30 and 52 km for a GOS of 2%. |
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