  This paper introduces a new quantization scheme for real and complex
Grassmannian sources. The proposed approach relies on a structured codebook
based on a geometric construction of a collection of bent grids defined from an
initial mesh on the unit-norm sphere. The associated encoding and decoding
algorithms have very low complexity (equivalent to a scalar quantizer), while
their efficiency (in terms of the achieved distortion) is on par with the best
known structured approaches, and compares well with the theoretical bounds.
These properties make this codebook suitable for high-resolutions, real-time
applications such as channel state feedback in massive multiple-input
multiple-output (MIMO) wireless communication systems.
