3. H/W Circuit Description
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3.3.5. Baseband Codec (BBC)
Baseband codec is composed of baseband uplink path(BUL) and baseband downlink path(BDL). BUL
makes GMSK(Gaussian Minimum Shift Keying) modulated signal which has In-phase(I) component
and quadrature(Q) component with burst data from DBB. This modulated signal is transmitted through
RF section via air.
BDL process is opposite procedure of BUL. Namely, it performs GMSK demodulation with input analog
I&Q signal from RF section, and then transmit it to DSP of DBB chip with 270.833kHz data rate
through BSP.
Figure 15. Baseband Codec Block Diagram
Содержание L1150
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