無線通信的多接技術 - 劃頻多接

• FDMA (Frequency Division Multiple Access)

....

N=(Bt-2Bg)/Bc

N: Number of Channels.

Bt:Total Spectrum Allocation.

Bg:Guard Band.

Bc:Channel Bandwidth.

EXAMPLE:

If Bt is 25 MHz, Bg is 100 kHz, and Bc is 200 kHz, find the number of channel

available in FDMA system.

SOLUTION:

N=(25x1000-2x100)/200=124. ( In fact, this case is the GSM.)

ARFCN (Absolute Radio Frequency Channel Number)

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