  Next-generation communication systems with wide bandwidths need to operate in
interference-limited networks. A discrete-time delay (TD) technique in a
baseband receiver array is proposed for canceling wide modulated bandwidth
spatial interference and reducing the ADC dynamic range requirements. The
proposed discrete TD technique first aligns the interference using non-uniform
sampled phases followed by uniform cancellation using a Truncated Hadamard
Transform implemented with antipodal binary coefficients. A digital
timeinterleaver with 5 ps resolution spanning 15 ns implements a scalable
discrete TD to compensate the inter-element delay, while the
multiply-accumulate in the signal path is simplified by implementing a 1-bit
differential truncated Hadamard matrix. Measured results demonstrate greater
than 35 dB cancellation over 80 MHz modulated bandwidth in 65 nm CMOS with a
592x improvement over prior-art demonstration of wide modulated bandwidth
interference cancellation.
