This Part A considers the situation where a digital fixed link receives interference from radio (natural) noise plus an unwanted interferer of power set at 6 dB above the natural noise. Current fixed link assignment strategies are commonly noise limited. This means that the minimum receiver signal level under fading is set to a particular level with respect to the system noise floor and the ambient noise. The assignments are then planned such that the maximum level of an unwanted signal is set by a protection ratio that results in the unwanted signals typically being approximately 6 dB below the noise. This approach is relatively safe and easy to define, but suffers from being sub-optimum. It is advantageous in maximizing the number of links that can be accommodated in a given band and geographical area to arrange that systems are interference limited. In other words, that the unwanted signals, not natural noise, set the environmental noise floor. Such a strategy brings forth the need to assess the performance of fixed-link receivers in the presence of unwanted signals of other modulation schemes as well as Gaussian noise.
ITU-R REPORT SM.2022-1-2004由国际电信联盟 IX-ITU 发布于 2004-01-01。
ITU-R REPORT SM.2022-1-2004 在中国标准分类中归属于: M38 数字通信设备。
ITU-R REPORT SM.2022-1-2004 其它调制方案对数字通信系统的干扰影响 于 2013-03-13 变更为 NF X31-230-1-2013 土质.污染物对土壤植物群影响的测定.第1部分:抑制根系生长的测量方法。
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