Reduced-size ultra-wideband true-time-delay beam-forming receivers

This paper presents two novel ultra-wideband (UWB) true-time-delay beam-forming receiver architectures to reduce the size of the receiver compared to the reported beam-forming receivers. Size reduction is due to lowering the total amount of delay by half and employing a negative feedback loop in the receiver. The proposed systems are analyzed to investigate their response, Inter-symbol-Interference (ISI) rejection, stability, beam width, signal to noise ratio (SNR) and the effect of non-idealities. The simulation results prove that the first proposed system has lower area for the same number of antennas and half the delay compared to the existing receivers at the cost of lower SNR and wider beam width. The second system results in a smaller size and better SNR for half the delay compared to the existing receivers at the cost of higher complexity.

[1]  I.I. Immoreev,et al.  Ultra wideband radar systems: advantages and disadvantages , 2002, 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No.02EX580).

[2]  Mark A. Barnes,et al.  Preliminary interferometric images of moving targets obtained using a time-modulated ultra-wide band through-wall penetration radar , 2001, Proceedings of the 2001 IEEE Radar Conference (Cat. No.01CH37200).

[3]  John G. Proakis,et al.  Digital Communications , 1983 .

[4]  J. Roderick,et al.  Silicon-Based Ultra-Wideband Beam-Forming , 2006, IEEE Journal of Solid-State Circuits.

[5]  Hossein Hashemi,et al.  Integrated true-time-delay-based ultra-wideband array processing , 2008, IEEE Communications Magazine.

[6]  Hossein Hashemi,et al.  A 4-Channel UWB Beam-Former in 0.13μm CMOS using a Path-Sharing True-Time-Delay Architecture , 2007, 2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers.

[7]  Georgios B. Giannakis,et al.  Ultra-wideband communications: an idea whose time has come , 2003, 2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications - SPAWC 2003 (IEEE Cat. No.03EX689).