文档介绍：WIFI RF SYSTEM DESIGN
无线宽频网络设计规划研究报告
7/2/2005
Introduction
Coverage, interference, and blocking considerations are the center of the RF system design work. For any point in the service area of the RF system, we must first have enough RSL in both uplink and downlink directions. The required signal is mainly bat the noise in the environment. In an analog voice system, this RSL provides the system with enough S/N so that the voice quality is acceptable. In a digital system, the S/N renders a low enough BER so that the amount of retransmission is within limit and the system can operate normally. Coverage can be improved by raising the transmitter power or by installing more transmitter sites. But doing so will have impact on the other two design considerations let alone the cost factor.
含盖,干扰,.( Downlink )及上行( Uplink )( RSL )应该满足系统中主讯号与噪声的比值( S/N )..
The co-channel interference has similar effect as the noise. It also deteriorates munications quality and must be controlled. Raising the power of a transmitter can improve SIR and munication quality but there are limits to the maximum power a transmitter can have. Besides, raising the power of one transmitter can raise the interference at other receivers and adversely impact the performance of the whole system. Consequently, arbitrarily raising transmitter power does not seem to be a viable solution.
同频干扰和噪声对R/( SIR ),.
The co-channel es as an unavoidable consequence of channel reuse. The channel can be a frequency channel in an FDMA system, a time slot in a TDMA system, or a code in a CDMA sys