I am trying to interleave two similar but not identical pass-band (analog) signals (i.e., both have a center frequency of 15 MHz, and a bandwidth of 200 kHz) on a sample by sample basis. The idea is that once interleaved in the analog domain, my one-channel receiver will down-convert the interleaved signal to baseband, and will sample it at the desired rate. Then, I will be able to de-interleave the signal on a sample by sample basis in the digital domain to recover the two signals. Pictorially, what I am trying to achieve in the analog domain is depicted below:
S1 (pass-band signal): + + + + + + S2 (pass-band signal): o o o o o o Interleaved (pass-band signal, to Receive Channel) : + o + o + o + o + o
The digital part is easy to realize, however, I have few issues with the analog part. What is the best way to interleave two similar pass-band (analog) signals such that when they are down-converted to baseband and sampled, they can be de-interleaved on a sample by sample basis as shown above?
I thought about one way to achieve this through using an RF switch with a switching speed twice the center frequency. Does that make sense? Are there better ways to realize this?
I'll appreciate any ideas.