第一是对一个国家所能接收的外国援助金额与其财政收入的比例设定上限，比如说50%。
The first is to cap the amount of foreign aid going to each country to, say, 50 per cent of its revenues.
在系统中存在多用户干扰及接收机散粒噪声的情况下，推导出该系统误码率上限，并对该系统特性与无光硬件限幅器的光PPM- CDMA通信系统特性作了比较。
The performance of the system is evaluated when considering the effects of both multi user interference and photo detector shot noise. An upper bound on the bit error rate is derived.
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