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概述 MMDS频率资源有限,多台大面积覆盖网的建设过程中必然会遇到同频道干扰问题,为此在区域规划和系统设计中必须利用极化分割、天线前后比、频率偏置以及频道分组等多种措施,还需要合理选择系统参数,来使各个MMDS系统服务区内的同频道干扰保护比满足有关技术标准。 频率偏置技术是降低同频道保护比要求的有效措施,早在50年代已用于电视地面传输网,在我国也
Overview MMDS frequency resources are limited, many large area coverage network will inevitably encounter the same channel interference problems, for the planning and system design in the region must use the polarization division, antenna ratio, frequency offset and channel grouping A variety of measures, but also a reasonable choice of system parameters, to make each MMDS system service area within the same channel interference protection ratio to meet the relevant technical standards. Frequency offset technology is to reduce the protection of the same channel than the effective measures required, as early as the 50’s have been used for television transmission network in the ground in our country