A brief discussion on the precautions for using C network repeaters VIP Information http://www.cqvip.com VIP Information http://www.cqvip.com Special Topic Network Planning and Optimization Repeater Uplink Noise Level Pnr-1-1 1 3dBm+ Repeater Design In addition, the forward and reverse gains of the repeater must be strictly controlled to be lower than the antenna isolation 10~15dB, otherwise not only the repeater cannot work normally, but also the performance of the donor base station will be seriously affected. When the antenna isolation cannot meet the basic requirements, the isolation problem can be solved by adjusting the antenna position (increasing the distance between the donor antenna and the service antenna) or increasing the noise coefficient Nf + repeater uplink gain Gr = 58dBm (generally, take Nf = 5dB, Gr = 50dB) to obtain the noise level PNb arriving at the input of the donor base station power division coupling unit (CDU): PNb = repeater uplink noise level Pnr = spatial loss Lp from the output of the repeater to CDU Assume: Lp = 65dB, then Pnb = 1.23dBm Adding an isolation network and other methods. 5 Distance control between optical fiber repeater and donor base station First, according to the IS-95 standard, the maximum search window determined by the paging channel is 384 chips. The chip rate is 1.2288 MHz, and the maximum delay between the base station and the mobile terminal is: T = 3 8 4 / (2 × 1.2 28 8) = 1 5 6.2 (us) The above formula shows...
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