Analyses of orthogonal and non-orthogonal steering vectors at millimeter wave systems

TitleAnalyses of orthogonal and non-orthogonal steering vectors at millimeter wave systems
Publication TypeConference Paper
Year of Publication2016
AuthorsChiang H-L, Kadur T, Fettweis G
Published in2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM)
Page(s)1-6
Date Published06/2016
Keywordsanalog beamforming, angle of arrival, angle of departure, AoA, AoD, array signal processing, beamforming gain, beamforming performance, codebook, Frequency-domain analysis, Gain, Indexes, millimeter wave, millimeter wave communication, millimeter wave system, millimetre waves, nonorthogonal steering vector, orthogonal steering vector set, orthogonal steering vectors, Radio frequency, Receivers, set theory, spatial frequency, spatial frequency domain, spatial frequency indices, steering angle, Transmitters
Abstract

Beamforming is one of the most challenging problems for millimeter wave communication. With limited codebook size, how to design the steering angles to compensate angles of arrival and departure (AoAs/AoDs) is essential to beamforming performance. Typically, two categories of steering vector sets are commonly used. One is orthogonal steering vector set where the spatial frequency indices of the steering angles are uniformly distributed in spatial frequency domain. The other one is non-orthogonal steering vector set where the steering angles are uniformly distributed in angle domain. In this paper, analyses of these two designs are presented. Due to the fact that beamwidth are constant with respect to different spatial frequency indices in spatial frequency domain, if the spatial frequency indices are uniformly distributed, one has the smallest deviation of the beamforming gain. Since the orthogonal steering vectors satisfy this condition that spatial frequency indices are uniformly distributed, they can achieve higher data rates than the non-orthogonal ones when the AoAs are uniformly distributed over (-π/2, π/2).

Acknowledgment

The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n°619563 (MiWaveS).

URLhttp://www.icsi.berkeley.edu/pubs/initiatives/analysesoforthogonal16.pdf
DOI10.1109/WoWMoM.2016.7523581
ICSI Research Group

Research Initiatives