  A programmable ultra-wideband sliding correlator-based channel sounder with
high temporal and spatial resolution is designed in standard 65 nm CMOS. The
baseband chip can be configured either as a baseband transmitter to generate a
pseudorandom spread spectrum signal with flexible sequence lengths, or as a
baseband receiver with sliding correlator having an absolute timing reference
to obtain power delay profiles of the multipath components of the wireless
channel. The sequence achieved a chip rate of one Giga-bit-per-second,
resulting in a multipath delay resolution of 1 ns. The baseband chip occupies
an area of 0.66 mm x 1 mm with a power dissipation of 6 mA at 1.1 V in 65 nm
CMOS. The sliding correlator-based channel sounder in this work is a critical
block for future low-cost, miniaturized channel sounding systems used in
accurate and efficient channel propagation measurements at millimeter-wave
frequencies.
