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題名 | Performance Analysis of a Cellular CDMA System Using Directional Antenna over Nakagami Multipath Fading Channels=使用方向性天線之細胞式分碼多重進接系統在Nakagami多路徑衰減通道之性能分析 |
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作者姓名(中文) | 林叢得; | 書刊名 | 電信研究 |
卷期 | 31:1 2001.02[民90.02] |
頁次 | 頁97-113 |
分類號 | 448.813 |
關鍵詞 | 分碼多重進接; 分割區域波束對應天線; RAKE接收機; Code division multiple access; CDMA; Beam steering-sectorized antenna; RAKE receiver; |
語文 | 英文(English) |
中文摘要 | 本篇文章研究Nakagami衰減對使用方向性天線及RAKE接收機的分碼多工進接細 胞式行動通信系統之上鏈路效能的影響,分析中假設通道為WSSUS模型並有理想的功率控 制,另外還分析RAKE接收機相位誤差與通話活動率的影響。本文推道出系統上鏈路在頻率 選擇通道中使用最大比結合成式之非理想調RAKE接收機的錯誤率,並計算使用波束對應扇 型對應天線的系統效能與全向性及扇型天線之效能比較。本文所推導之訊雜比可直接描述 RAKE接收機的分技數、使用者數目、Nakagami衰減參數、天線方向性、通話活動率間的關 係,分析結果顯示細胞式皆碼多工進接系統的性能隨著使用者數目、干擾細胞、干擾路街的 增加而降低並隨著衰減參數的增加而變佳,此外,在多使用者環境中波束對應扇型天線比扇 型天線可提供更多的容量。 |
英文摘要 | An effect of Nakagami fading on the performance of the reverse link of code division multiple access (CDMA) cellular system using directional antenna and RAKE receiver is analyzed in this paper. A wide-sense stationary uncorrelated scattering (WSSUS) channel model and perfect power control are assumed in the analysis. The impacts of phase error of RAKE receiver and voice activation are also investigated. The average error probabilities for reverse link of cellular CDMA system over frequency-selective fading cannel using partially coherent RAKE receiver of cellular CDMA system using steering-sectorized antenna is quantified and compared with that of systems using omni-directional and sectorization antenna respectively. The signal-to-noise ratio derived in this paper can directly describe the interrelationships among number of branches of RAKE receiver, number of users, Nakagami fading parameter, directivity of antenna, and voice activity factor. The analytical results show that the performance of the cellular CDMA system degrade with an increase in the number of simultaneous users, number of interfering cells, and number of paths, yet a decreasing value of Nakagami fading parameters. In addition, cellular CDMA system with a beam steering-sectorized array antenna has better capacity than that with a sectorization antenna in the multi-users environment. |
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