通信毕业设计文献翻译(编辑修改稿)

通信毕业设计文献翻译(编辑修改稿)内容摘要：

nal receiving level above more than85dBm can be considered good at wireless work coverage. 2. 2 calculated ways between GSM work capacity and carriertointerference ratio C / I Carrier to interference C / I is often used to measure the quality of GSM work mobile calls. If use MRP (multifrequency reuse method) to carry out frequency planning, planning can be calculated to achieve the C / I, the following formula can be applied to broadly calculate: a is the path loss slop of propagation model。 D is the distance between the centers of two neighboring cell groups, which the most closest distance between the same frequency district, also known as frequency reuse distance。 R is radius semihexagonal circumcircle ,that cell coverage radius。 Ki is conditions for the spread, the direction of decoupling the antenna, antenna tilt and other factors under the prehensive correction factor (remended values range from 5 to 0). 3. 2 COMMON BCCH Technology COMMON BCCH frequency of BTS is a way of using DCS1800M of radio frequency resources to supplement GSM900M singlecarrier frequency of the cellular sector in order to achieve the increase on capacity. Opening cell functions of the dual standard obtains the。