Ovrrbu-bts. Pdf
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- Điều hướng trang này:
- 1.6.2 Spectrum Frequencies
- AirLink 8000 1/30/00
| AirLink 8000
1/30/00 BASE TRANSCEIVER STATION Release 1.00 2 - 11 1.6 RADIO FREQUENCY DETAILS 1.6.1 Radio Link Some of the important characteristics of a radio access link are — the spectrum used, frequencies of operation, spectral efficiency, multiple access protocol, dynamic range, and traffic carrying capacity. These aspects are discussed in detail below for AirLink 8000. 1.6.2 Spectrum & Frequencies As mentioned earlier, AirLink 8000 is a CDMA system. It requires a separate 2.72 MHz (3.5 MHz including guardbands) channel in each direction separated by either 100MHz, 119 MHz, or 175 MHz of bandwidth, depending on the band of operation. The system will operate in one of four 3.5 MHz sub- channel pairs in one of the 14 MHz channel pairs as allocated by ITU-R 283-5, and shown below. Currently available spectrum of operation is 2.1 - 2.3 GHz and 2.5 - 2.7 GHz (per ITU-R 283-5), 3.4 – 3.7 GHz (per CEPT REC. 1403-E, ANNEX B), and 2.0 – 2.3 GHz (per ETSI DE/TM 04031). f 1 f 2 f 3 f 4 f 5 f 6 f 1’ f 2’ f 3’ f 4’ f 5’ f 6’ f 0 14 MHz f N f N f A f B f C f D f A =f N -5.008 MHz f C =f N +1.536 MHz f B =f N -1.736 MHz f D =f N +4.808 MHz 1 2 3 4 5 6 Channel # 1’ 2’ 3’ 4’ 5’ 6’ Sub-Channels: CHANNEL # AirLink 8000 1/30/00 BASE TRANSCEIVER STATION Release 1.00 2 - 12 tải về 0.71 Mb. Chia sẻ với bạn bè của bạn:
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