Abstract
Pilot overhead constitutes a bottleneck in vehicle-to-vehicle (V2V) underlay massive multiple-input multiple-output (MIMO) cellular networks. To decrease the pilot overhead and further improve the spectral efficiency, we propose pilot reuse for V2V underlay massive MIMO transmission. First, based on the angle domain sparsity of massive MIMO channels, we derive the channel angle domain condition under which the channel estimation mean-square-error for cellular and V2V links can be both minimized. Motivated by this condition, we then develop an angle information assisted pilot assignment (AIAPA) algorithm. Numerical results indicate that the proposed angle information assisted pilot reuse scheme can significantly improve the performance of spectral efficiency compared with the conventional orthogonal pilot scheme for both cellular and V2V links.
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