Hongwei,
In addition to the PLL that tracks the external 10MHz ref to produce the
internal 10 MHz ref, there are the four PLLs that track the internal 10 MHz
ref to produce the four LO signals (2Tx/2Rx) as you mentioned. But, the
phase variation from the LO PLLs is much less - I don't really know
Thanks, Rob and Marcus.
A single tone is repeatedly transmitted to make a continuous stream out of the
Tx antenna. It is periodically sampled in Rx; the interval is about 1s. The
sample time is aligned with the beginning of the transmitted signal to make
sure we sample at the same time across a
