Optimal monobit digital receiver for QPSK modulation with phase rotation

High-speed high-resolution analog-to-digital converter (ADC) is a key bottleneck in large-bandwidth systems such as 60 GHz communication of wireless personal area networks (WPANs), due to its large power consumption and high complexity. Hence, monobit ADC has been previously proposed to address this problem. In this paper, we propose a receiver architecture with monobit sampling and carrier phase rotation for quadrature-phase-shift-keying (QPSK) modulation. The optimal rotation phase is derived from the achievable-rate point of view. Then, a suboptimal but low-complexity monobit receiver is obtained, and the impact of different rotation phases is investigated. The optimal rotation phase is found to be π/4. Simulation results show that there is only about 1dB signal-to-noise ratio (SNR) loss with a rotation phase deviation of 15° from the optimal value, providing a pretty good robustness to implementation imperfection.

[1]  Huarui Yin,et al.  Monobit Digital Receivers for QPSK: Design, Analysis and Performance , 2012, ArXiv.

[2]  S. Yong,et al.  TG3c channel modeling sub-committee final report , 2007 .

[3]  Boris Murmann,et al.  A/D converter trends: Power dissipation, scaling and digitally assisted architectures , 2008, 2008 IEEE Custom Integrated Circuits Conference.

[4]  Jun Wang,et al.  Monobit digital receivers: design, performance, and application to impulse radio , 2010, IEEE Transactions on Communications.

[5]  P.F.M. Smulders,et al.  Exploiting the 60 GHz band for local wireless multimedia access: prospects and future directions , 2002, IEEE Commun. Mag..

[6]  Brian M. Sadler,et al.  Monobit digital receivers for ultrawideband communications , 2005, IEEE Transactions on Wireless Communications.

[7]  Stefan Krone,et al.  Achievable rate of single-carrier systems with optimal uniform quantization at the receiver , 2010, 2010 IEEE Information Theory Workshop on Information Theory (ITW 2010, Cairo).

[8]  Upamanyu Madhow,et al.  On block noncoherent communication with low-precision phase quantization at the receiver , 2009, 2009 IEEE International Symposium on Information Theory.

[9]  Jesus Grajal,et al.  Analysis and characterization of a monobit receiver for electronic warfare , 2003 .

[10]  Borivoje Nikolic,et al.  Scaling of analog-to-digital converters into ultra-deep-submicron CMOS , 2005, Proceedings of the IEEE 2005 Custom Integrated Circuits Conference, 2005..