Method for assigning antenna directional pattern utilized to cover wireless signal in room

• Main Author: HONGTAO RU
• Format: Patent
• Language: Chinese; English
• Published: 11.08.2004
• Edition: 7
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

Based on index of path loss and height difference between indoor antenna and user antenna, adjusting assigned antenna pattern keeps constant signal in covered area. The assigning formula is: f (theta, phi) = CONST + 10nlg (h/sin theta), where theta and phi are relevant included angles, CONST is a constant. Indoor antenna is a transmitting antenna, and user antenna is an omnidirectional antenna installed on ceiling. The invention can reduce transmitting power in downward direction so as to reduce cost and power consumption as well as reduces interference on outdoor macro cellular system or other system, and reduces pressure of reverse chain amplifier. The invention makes possible to treat noise factor and linear relation. 一种用于无线信号室内覆盖的天线方向图赋形的方法，根据路径损耗指数以及室内天线和用户天线之间的高度差，天线方向图赋形调整，保持覆盖区域信号的恒定，其中赋形公式：f(θ，φ)＝CONST+10nlg(h/sinθ)；θ为以天花板平面为一个基准面、以室内天线的中心点为基准、用户天线与该中心点的连线与天花板平面的夹角；φ为用户天线与室内天线中心的连线在天花板上的投影与该平面的夹角；CONST为一常数；室内天线为发射天线；用户天线为全向天线；天线为室内吸顶天线。本发明通过室内天线方向图赋形，可以减小下行的发射功率，从而减小成本和功耗；可以减小对室外宏蜂窝或其他系统的干扰；可以减小对反向链路放大器的压力，使得很好地处理噪声系数和线性的关系成为可能。