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通信bts载频板电路图,元器件说明。gsm900,dcs1800
gsm900,dcs1800,dcs1900的电路连接图,pcb图,以及元器件说明和供应商。希望对大家学电路的有用
2010-06-04
Concepts of 3GPP WCDMA
W-CDMA is a 3G CDMA digital wireless system
5 MHz channel bandwidth
Variable data rate up to 2 Mbps
QPSK modulation
Physical Channels Have a Two Layer Structure:
Radio frame: 10 ms frame consisting of 15 timeslots
Timeslot: 667 usec slot consisting of a number of Symbols
Symbols are Defined as:
One Symbol Consists of a Number of Chips .
The Number of Chips per Coded Symbol is Equal to the Spread Factor of the Physical Channel
Chip is a Bit at the Final Spreading Rate of 3.84 Mchips/s
2010-06-04
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