REVERSE LINK CDMA SYSTEM CAPACITY EVALUATION FOR STRATOSPHERIC PLATFORM MOBILE COMMUNICATIONS
نویسندگان
چکیده
منابع مشابه
Effect of Spreading Bandwidth on DS-CDMA Reverse Link Capacity
This paper addresses an important issue on the spreading bandwidth of direct sequence code division multiple access (DS-CDMA) cellular mobile radio systems: does wider spreading bandwidth provide larger capacity? And if so, to what extent? The capacity of the perfect power controlled reverse link is evaluated by computer simulation for 1.25MHz and 5MHz spreading bandwidths under various sets of...
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あらまし 高速移動通信では周波数選択性フェージングにより伝送特性が劣化してしまうが,DS-CDMA では遅延波を分離 合成する RAKE 受信を適用して伝送特性を改善することができる.しかし,同一周波数を多数のユーザが共有するので,上り リンクの場合は,遠近問題によりマルチアクセス干渉が生じ伝送特性が大幅に劣化してしまう.これを解決するために用いられ るのが送信電力制御である.DS-CDMAセルラーシステムのリンク容量を求めるには,移動局と各基地局のシャドウィング損失 が無相関という仮定がよく用いられている.しかし,移動局のアンテナ高が低く移動局のまわりの遮蔽物の影響を同じように受 けることになると,各基地局とのシャドウィング損失に相関が発生してしまう.本論文は,シャドウィング相関が,DS-CDMA セルラーシステムの上りリンク容量に及ぼす影響を,計算機シミュレーションにより明らかに...
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ژورنال
عنوان ژورنال: MAKARA of Technology Series
سال: 2010
ISSN: 1693-6698
DOI: 10.7454/mst.v11i2.525