Test results for a 10-Gbps prototype demonstrator working at 71~76 GHz frequency band with a 2-bit/s/Hz spectral efficiency are reported. To overcome the speed limitation of the commercial DA/ADs, a two-channel analog IF multiplexing and demultiplexing topology is adopted as a trade-off between cost and spectrum efficiency. The same approach is also used to achieve up to 20 Gbps with a full 10-GHz bandwidth of the allocated commercial bands (71~76 GHz and 81~86 GHz).
